Probabilistic programming anyone?

[Frank Wood]

I'm a professor at Oxford and my group has been working on a new embedded 
language called Anglican:

http://www.robots.ox.ac.uk/~fwood/anglican/

It can be used to do advanced machine learning in Clojure (Java, etc.) 
applications without having to know anything about inference or math.  For 
example see:

http://www.robots.ox.ac.uk/~fwood/anglican/examples/index.html

My group would be very interested to get feedback on the language design 
and its usefulness to the community.  Also, frankly, we could use your help 
in taking it forward, where "help" largely means writing queries and 
telling us what doesn't work.

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Re: separation of concerns w/o encapsulation

[Georgi Danov]

No tool or technology beats the combination of:
a) component/responsibility blueprint
b) discipline in communicating, following and adapting it

encapsulation can be a nice safety net once you have the things above, but 
it would never be a solution to the problem. just a convenience.

coding and designing defensively because you are concerned about your 
teammates is big waste of time. if this is the reality (in the enterprise 
it's the norm) guess clojure is not the best tech for that organization.

On Friday, May 8, 2015 at 6:29:50 PM UTC+2, Brian Craft wrote:
>
> Talk on the list about encapsulation usually comes back to some variation 
> of "you don't need it when you have immutable data structures". But in the 
> long term I'm finding the problem of working w/o encapsulation is not the 
> danger of data being mutated under you. Rather, it's the danger of all the 
> module boundaries blurring over time, leading to the big ball of mud: a 
> very fragile code base where everything depends on everything else.
>
> E.g. if you model your application with a plain data structure which you 
> pass around to different modules, each concerned with a small part of that 
> data structure, the tendency over time is for every module to become 
> concerned with every part of that data structure.  Then you have no 
> separation, nothing is reusable, and the code is very fragile.
>
> How do you avoid this, practically? In OO it would be enforced with 
> encapsulation, so the next developer (which might be me, six months later) 
> trying to fix a bug, or add a feature, knows "Oh, I shouldn't peek in here: 
> this module isn't supposed to depend on that piece of data".
>

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[ANN] Dominator - Virtual DOM in ClojureScript

[David Sargeant]

I'm excited to announce the first release of Dominator 
. Dominator brings the 
simplicity and performance of the Virtual-DOM 
 project to ClojureScript 
. Dominator encourages a single 
flow of events, using pure functions for updating state and rendering, and 
using Zelkova /core.async 
 for data flow. The concepts and 
patterns from the Elm  language are used extensively.

Please hit me up with any questions.

David


https://github.com/dubiousdavid/dominator

[dominator "0.1.0"]

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Re: What does ^:internal mean?

[David James]

Re: "Some people don't like the native approach to private vars since 
anyone who wants to override it can do so anyway, so they go with a purely 
conventional and unenforced approach: delineate the boundaries of API vs 
internal using :internal or :impl and/or put the internal bits in an impl 
namespace."

Yes. I've used this approach myself sometimes.

Function metadata can also enhance documentation generation. Functions with 
^:internal metadata could be treated and presented as "internal API" 
only. I don't know if codox or marginalia are customizable in this way.

On Monday, May 11, 2015 at 8:35:06 PM UTC-4, Mischov wrote:
>
> To answer your question, ^:internal is shorthand meaning "set the 
> :internal key of the object's metadata to true".
>
> You can read more about metadata here .
>
> On Sunday, May 10, 2015 at 2:00:10 PM UTC-5, piast...@gmail.com wrote:
>>
>>
>> What does ^:internal mean in this context? 
>>
>>
>>
>>
>>
>>
>>
>>

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Re: [ANN] Dominator - Virtual DOM in ClojureScript

[Rostislav Svoboda]

> Dominator brings the simplicity and performance of the Virtual-DOM
project to ClojureScript.

Is this the same "kind" of Virtual DOM as in facebook react? I.e. is
Dominator a react replacement (written in cljs, of course)?

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Re: [ANN] Dominator - Virtual DOM in ClojureScript

[David Sargeant]

In this case I'm referring to a project called virtual-dom, which is a 
separate project from React. It is conceptually the same as React, but is 
smaller, faster, and generally more in line with functional programming 
principles.

https://github.com/Matt-Esch/virtual-dom

David

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Re: separation of concerns w/o encapsulation

[Brian Craft]

On Tuesday, May 12, 2015 at 4:29:22 AM UTC-7, Georgi Danov wrote:
>
> coding and designing defensively because you are concerned about your 
> teammates is big waste of time. if this is the reality (in the enterprise 
> it's the norm) 
>

Yes, it is the norm in the enterprise. In a decade of enterprise coding, 
encapsulation became a conditioned response. Anything exposed would be 
abused, guaranteed. It was impossible to enforce through documentation, due 
to the size of the organization. Requiring another team to read the docs, 
and respect API boundaries when committing, involved trying to persuade 
three layers of management that it was important enough to institute such a 
policy. From the VP perspective, shipping next week was always more 
important. Encapsulation was the only tool that worked.

To some degree, it's the norm in other contexts as well. We see in popular 
languages w/o encapsulation that users invariably code to the internals, 
making it difficult or impossible to refactor libraries.

http://ziade.org/2010/03/03/the-fate-of-distutils-pycon-summit-packaging-sprint-detailed-report/

When you have enough users, the cost of such breakage is quite high. Then 
"they should have known better" doesn't fly as an argument.

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contains? on String

[Shantanu Kumar]

Hi,

I notice the following in Clojure 1.7.0-beta2:

user=> (contains? "hello" 2)
true
user=> (contains? "hello" \e)

IllegalArgumentException contains? not supported on type: java.lang.String 
 clojure.lang.RT.contains (RT.java:800)


Is this just a case of misleading error message or am I missing something?

Shantanu

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Re: contains? on String

[James Reeves]

contains? has always been a little counter-intuitive. It essentially only
works on collections that allow for a constant or logarithmic lookup time,
and often works on the "keys" of a collection, rather than its values. The
only exception to this are sets, where the values are essentially keys as
well.

So:

(contains? {:a 1} :a) => true
(contains? {:a 1} 1) => false
(contains? [:a] :a) => false
(contains? [:a] 0) => true
(contains? #{:a} :a) => true
(contains? "a" \a) => error
(contains? '(:a) :a) => error

- James

On 12 May 2015 at 19:25, Shantanu Kumar  wrote:

> Hi,
>
> I notice the following in Clojure 1.7.0-beta2:
>
> user=> (contains? "hello" 2)
> true
> user=> (contains? "hello" \e)
>
> IllegalArgumentException contains? not supported on type: java.lang.String
>  clojure.lang.RT.contains (RT.java:800)
>
>
> Is this just a case of misleading error message or am I missing something?
>
> Shantanu
>
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Re: contains? on String

[Shantanu Kumar]

I agree about the counter-intuitiveness. I'm only wondering whether the 
error message is a bit misleading "contains? not supported on type: 
java.lang.String" because of course (contains? "hello" 2) works fine.

Shantanu

On Wednesday, 13 May 2015 00:12:19 UTC+5:30, James Reeves wrote:
>
> contains? has always been a little counter-intuitive. It essentially only 
> works on collections that allow for a constant or logarithmic lookup time, 
> and often works on the "keys" of a collection, rather than its values. The 
> only exception to this are sets, where the values are essentially keys as 
> well.
>
> So:
>
> (contains? {:a 1} :a) => true
> (contains? {:a 1} 1) => false
> (contains? [:a] :a) => false
> (contains? [:a] 0) => true
> (contains? #{:a} :a) => true
> (contains? "a" \a) => error
> (contains? '(:a) :a) => error
>
> - James
>
> On 12 May 2015 at 19:25, Shantanu Kumar  > wrote:
>
>> Hi,
>>
>> I notice the following in Clojure 1.7.0-beta2:
>>
>> user=> (contains? "hello" 2)
>> true
>> user=> (contains? "hello" \e)
>>
>> IllegalArgumentException contains? not supported on type: 
>> java.lang.String  clojure.lang.RT.contains (RT.java:800)
>>
>>
>> Is this just a case of misleading error message or am I missing something?
>>
>> Shantanu
>>
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>

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Re: contains? on String

[James Reeves]

On 12 May 2015 at 19:54, Shantanu Kumar  wrote:

> I agree about the counter-intuitiveness. I'm only wondering whether the
> error message is a bit misleading "contains? not supported on type:
> java.lang.String" because of course (contains? "hello" 2) works fine.
>

Oh, I see! Yes, that is a bit misleading.

- James

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Re: contains? on String

[Michael Gardner]

On May 12, 2015, at 1:54 PM, Shantanu Kumar  wrote:
> I agree about the counter-intuitiveness. I'm only wondering whether the error 
> message is a bit misleading "contains? not supported on type: 
> java.lang.String" because of course (contains? "hello" 2) works fine.

It seems odd that (contains? "abc" 2) works, at least to me. It's clearly 
intentional, from this line in RT.java:

else if(key instanceof Number && (coll instanceof String || 
coll.getClass().isArray())) {

Can anyone comment on why Strings are explicitly supported here?

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Re: Probabilistic programming anyone?

[hyang]

Looks great. Could I use this to implement something like a Gibbs Sampler? 

On Tuesday, May 12, 2015 at 3:05:50 AM UTC-7, Frank Wood wrote:
>
> I'm a professor at Oxford and my group has been working on a new embedded 
> language called Anglican:
>
> http://www.robots.ox.ac.uk/~fwood/anglican/
>
> It can be used to do advanced machine learning in Clojure (Java, etc.) 
> applications without having to know anything about inference or math.  For 
> example see:
>
> http://www.robots.ox.ac.uk/~fwood/anglican/examples/index.html
>
> My group would be very interested to get feedback on the language design 
> and its usefulness to the community.  Also, frankly, we could use your help 
> in taking it forward, where "help" largely means writing queries and 
> telling us what doesn't work.
>

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Re: Probabilistic programming anyone?

[hyang]

Another question: is there a particular reason why the code of Anglican is 
hosted on BitBucket with read only access for outsider, whereas the 
examples are on Github? Does that mean that you do not anticipate 
contributions to the language from the outside? I saw the license is GPL 
though.

On Tuesday, May 12, 2015 at 3:05:50 AM UTC-7, Frank Wood wrote:
>
> I'm a professor at Oxford and my group has been working on a new embedded 
> language called Anglican:
>
> http://www.robots.ox.ac.uk/~fwood/anglican/
>
> It can be used to do advanced machine learning in Clojure (Java, etc.) 
> applications without having to know anything about inference or math.  For 
> example see:
>
> http://www.robots.ox.ac.uk/~fwood/anglican/examples/index.html
>
> My group would be very interested to get feedback on the language design 
> and its usefulness to the community.  Also, frankly, we could use your help 
> in taking it forward, where "help" largely means writing queries and 
> telling us what doesn't work.
>

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[ANN] yada 0.4.0 - async REST web library

[Malcolm Sparks]

yada is a library for creating RESTful Ring handlers, similar(ish) to 
Liberator. The main difference is that yada fully supports async operation 
(provided by Zach Tellman's manifold library). It is a kind of reactive 
Clojure-based response to Java's ratpack.io or Scala's spray.io.

yada is designed to be sufficiently terse to be used for both RESTful web 
APIs and content. For example, here's how to create a Ring handler 
providing HTML5 server-sent-events via a core.async channel :-

(yada {:body (chan)})

yada is designed to complement bidi (a uri routing library). While both are 
separate libraries, yada's resource-maps combine with bidi's routes to 
define a full web API (providing sufficient information to publish a 
Swagger 2.0 specification if required).

Naturally yada is new, still alpha-status and under active development. I 
wanted to let folks know about it and would be grateful for any 
help/feedback prior to any beta release.

MIT licensed. Further information can be found in the docs which can be 
found both in the git repo (https://github.com/juxt/yada) and self-hosted 
at http://yada.juxt.pro

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Re: Clojure needs a web framework with more momentum

[Malcolm Sparks]

> How do we effectively leverage some of the more advanced Clojure-oriented 
webservers such as Aleph and Immutant?

I've just posted about yada on another thread, a library for 'proper' 
handling of Ring requests, fully supporting async. Although yada is a 
separate library, it fully complements bidi (a url routing library).

There are a couple more complementary libraries on the way which will 
combine to form something akin to a 'web framework' discussed on this 
thread.

Regards,

Malcolm

On Sunday, 3 May 2015 04:19:19 UTC+1, puzzler wrote:
>
> Last week, at the Clojure/West conference, someone (I think it was Brandon 
> Bloom) summed up the general vibe well, by saying something along the lines 
> of, "We now have all the pieces in place to make web development an order 
> of magnitude more productive than in any other language, we just need to 
> figure out how to put it all together and make that happen."
>
> I think that's right.  From a technological standpoint, I think we're 
> there.  The things we most need are informational resources and 
> higher-level shared resources, such as UI widgets.  For example:
>
> How do we use Buddy/Friend effectively to achieve secure web apps?  (The 
> docs are not sufficiently informative for those who haven't thought much 
> about security and assume too much prior knowledge).
>
> How do we effectively leverage some of the more advanced Clojure-oriented 
> webservers such as Aleph and Immutant?
>
> Clojure is great for creating new, disruptive web models, but what's the 
> easiest path to creating something that can be done trivially with, say, 
> Drupal or Django?
>
> Since more and more people are working with Reagent/Om/etc., we need as 
> many Bootstrap-like widgets as possible for those tools, and more 
> informational resources about how to use these new reactive models 
> effectively, for example, how to do animated UIs.
>
> Are there reusable components like, say, shopping baskets?
>

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Re: contains? on String

[Fluid Dynamics]

On Tuesday, May 12, 2015 at 3:34:46 PM UTC-4, Michael Gardner wrote:
>
> On May 12, 2015, at 1:54 PM, Shantanu Kumar  > wrote: 
> > I agree about the counter-intuitiveness. I'm only wondering whether the 
> error message is a bit misleading "contains? not supported on type: 
> java.lang.String" because of course (contains? "hello" 2) works fine. 
>
> It seems odd that (contains? "abc" 2) works, at least to me. It's clearly 
> intentional, from this line in RT.java: 
>
> else if(key instanceof Number && (coll instanceof String || 
> coll.getClass().isArray())) { 
>
> Can anyone comment on why Strings are explicitly supported here?


Strings and arrays support constant-time access by index. The thing that's 
broken is "contains? not supported on type: java.lang.String" instead of 
nil when a nonnumeric key is used. One gets nil with a nonnumeric key and a 
PersistentVector, rather than an exception.

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Re: What does ^:internal mean?

[Jakub Holy]

You can use Symbol Hound to search for strange things though here it fails. Ex:

http://symbolhound.com/?q=-%3E%3E+clojure

On Sunday, May 10, 2015 at 9:00:10 PM UTC+2, piast...@gmail.com wrote:
> Sadly, Google seems to think I am search for "internal" when I search for 
> "^:internal" so that makes it hard to find the documentation. I am curious 
> about this code:
> 
> 
> 
> 
> ;;; Capture the standard def forms' arglists
> (def ^:internal defn-arglists (vec (:arglists (meta #'defn
> (def ^:internal fn-arglists (vec (:arglists (meta #'fn
> (def ^:internal defmulti-arglists (vec (:arglists (meta #'defmulti
> (def ^:internal def-arglists '[[symbol doc-string? init?]])
> 
> 
> From here: 
> 
> 
> https://github.com/palletops/api-builder/blob/4d82355bec1ebdf7c501be71e2f3d156ae84ad2c/src/com/palletops/api_builder/impl.clj
> 
> 
> 
> What does ^:internal mean in this context? 

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Re: What does ^:internal mean?

[Jakub Holy]

You can use Symbol Hound to search for strange things though here it fails. Ex:

http://symbolhound.com/?q=-%3E%3E+clojure

On Sunday, May 10, 2015 at 9:00:10 PM UTC+2, piast...@gmail.com wrote:
> Sadly, Google seems to think I am search for "internal" when I search for 
> "^:internal" so that makes it hard to find the documentation. I am curious 
> about this code:
> 
> 
> 
> 
> ;;; Capture the standard def forms' arglists
> (def ^:internal defn-arglists (vec (:arglists (meta #'defn
> (def ^:internal fn-arglists (vec (:arglists (meta #'fn
> (def ^:internal defmulti-arglists (vec (:arglists (meta #'defmulti
> (def ^:internal def-arglists '[[symbol doc-string? init?]])
> 
> 
> From here: 
> 
> 
> https://github.com/palletops/api-builder/blob/4d82355bec1ebdf7c501be71e2f3d156ae84ad2c/src/com/palletops/api_builder/impl.clj
> 
> 
> 
> What does ^:internal mean in this context? 

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Re: What does ^:internal mean?

[Raoul Duke]

even github gets it totally wrong, apparently?

https://github.com/laurentpetit/ccw/search?utf8=%E2%9C%93&q=%22^%3Ainternal%22&type=Code

because, you know, it isn't as if github is mostly all about hosting *code*.

such that, you know, you'd think they'd have realized by now this kind
of feature is desirable / the current functionality is a huge
lameness.

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Re: What does ^:internal mean?

[Raoul Duke]

knowing how to break down Clojure's syntax a bit helps, too. which
means newbies are kinda screwed until they divine this.

http://stackoverflow.com/questions/8920137/clojure-caret-as-a-symbol

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Re: What does ^:internal mean?

[Andy Fingerhut]

There are other sources for this information, too (perhaps better ones),
but the cheat sheet has a section with many of these special symbols:

clojure.org/cheatsheet

Andy

On Tue, May 12, 2015 at 1:49 PM, Raoul Duke  wrote:

> knowing how to break down Clojure's syntax a bit helps, too. which
> means newbies are kinda screwed until they divine this.
>
> http://stackoverflow.com/questions/8920137/clojure-caret-as-a-symbol
>
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Re: contains? on String

[Lee Spector]

> On May 12, 2015, at 4:28 PM, Fluid Dynamics  wrote:
> 
> On Tuesday, May 12, 2015 at 3:34:46 PM UTC-4, Michael Gardner wrote:
> On May 12, 2015, at 1:54 PM, Shantanu Kumar  > wrote: 
> > I agree about the counter-intuitiveness. I'm only wondering whether the 
> > error message is a bit misleading "contains? not supported on type: 
> > java.lang.String" because of course (contains? "hello" 2) works fine. 
> 
> Can anyone comment on why Strings are explicitly supported here?
> 
> Strings and arrays support constant-time access by index. The thing that's 
> broken is "contains? not supported on type: java.lang.String" instead of nil 
> when a nonnumeric key is used. One gets nil with a nonnumeric key and a 
> PersistentVector, rather than an exception.

The contains? function is just badly named, spawning a couple of different 
kinds of confusion. 

I know it's not going to change -- the problems have been pointed out for years.

But FWIW I find it's usually best to pretend it doesn't exist, and when my 
students run into trouble with it I suggest that they do the same.

 -Lee

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Re: contains? on String

[Michael Gardner]

On May 12, 2015, at 3:28 PM, Fluid Dynamics  wrote:
> Strings and arrays support constant-time access by index.

Yes, but why should that mean that contains? should work on Strings? "Because 
it can" doesn't seem compelling to me. In discussions about contains?, one 
often hears that it works on associative containers, which is supported by the 
use of the word "key" in its docstring. Vectors are indeed associative, but 
Strings aren't (at least according to associative?), which is why this seems 
like a strange feature to me.

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Re: Opinion on take-while for stateful transducers

[Andy-]

Thanks for the reply. I do like this. I think it's actually more elegant. 
Definitely going into my toolbox. One thing I dislike is that I still have 
to re-implement the logic of the already existing (performant & tested) 
transducers.
Also, I could also add a 4th parameter: 'terminate-early?' but that's then 
already 4 parameters to remember... I'll have to see what way is best once 
I implement more transducers with your or my (hacky) method.

Cheers

On Monday, May 11, 2015 at 1:34:31 PM UTC-4, miner wrote:
>
> Not an expert, but I’ll throw out an alternative approach that might work 
> for you.  I think it’s simpler to use a transducer that calls functions 
> rather than trying to transform an existing transducer to do the cutoff. 
>
> (defn take-while-accumulating [accf init pred2] 
>(fn [rf] 
>  (let [vstate (volatile! init)] 
>(fn 
>  ([] (rf)) 
>  ([result] (rf result)) 
>  ([result input] 
>   (if (pred2 @vstate input) 
> (do (vswap! vstate accf input) 
> (rf result input)) 
> (reduced result))) 
>
> accf is like a reducing function: takes two args, state and input, and 
> returns new state of the “accumulation”.  init is the initial state of the 
> accumulation.  pred2 is a predicate taking two args, the accumulation state 
> and the new input.  The process stops when pred2 returns false. 
>
> ;; distinct 
> (into [] (take-while-accumulating conj #{} (complement contains?)) '(1 2 3 
> 4 2 5 6)) 
> ;;=> [1 2 3 4] 
>
> ;; dedupe 
> (into [] (take-while-accumulating (fn [r x] x) ::void not=) '(1 2 1 3 4 4 
> 5 6)) 
> ;;=> [1 2 1 3 4] 
>
> ;; monotonically increasing 
> (into [] (take-while-accumulating max 0 <=) '(1 2 3 4 4 1 5 6)) 
> [1 2 3 4 4] 
>
>
> Steve Miner 
> steve...@gmail.com  
>
>
>   
>
> On May 9, 2015, at 6:28 PM, Andy- > 
> wrote: 
>
> > (defn take-while-xf 
> >   
> > "Takes a transducer and returns a transducer that will immediately 
> finish (ie 
> >   call (reduced)) when the transducer did not call the reducing function 
> and 
> >   just returned the result. Only really useful with stateful 
> transducers. 
> >   Otherwise you'd use take-while." 
> > 
> > [xf] 
> > 
>
>

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Re: contains? on String

[Devin Walters]

Ignoring some of the conversation here to point out that what you want is:
(.contains "foo" "f")

On Tue, May 12, 2015 at 4:04 PM, Michael Gardner 
wrote:

> On May 12, 2015, at 3:28 PM, Fluid Dynamics  wrote:
> > Strings and arrays support constant-time access by index.
>
> Yes, but why should that mean that contains? should work on Strings?
> "Because it can" doesn't seem compelling to me. In discussions about
> contains?, one often hears that it works on associative containers, which
> is supported by the use of the word "key" in its docstring. Vectors are
> indeed associative, but Strings aren't (at least according to
> associative?), which is why this seems like a strange feature to me.
>
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Re: contains? on String

[Fluid Dynamics]

On Tuesday, May 12, 2015 at 5:05:00 PM UTC-4, Michael Gardner wrote:
>
> On May 12, 2015, at 3:28 PM, Fluid Dynamics  > wrote: 
> > Strings and arrays support constant-time access by index. 
>
> Yes, but why should that mean that contains? should work on Strings? 
> "Because it can" doesn't seem compelling to me. In discussions about 
> contains?, one often hears that it works on associative containers, which 
> is supported by the use of the word "key" in its docstring. Vectors are 
> indeed associative, but Strings aren't (at least according to 
> associative?), which is why this seems like a strange feature to me.


Yes; and presumably you can't produce a string with one character changed 
using "assoc" either.

But it should work consistently. Either it shouldn't work for strings, or 
it should work fully, including producing nil for not-found with nonnumeric 
keys. Ditto arrays. 

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load a namespace at repl?

[piastkrakow]

If I: 

git clone https://github.com/overtone/overtone.git

cd overtone

lein repl

and then at the REPL, I try to load Overtone: 


user=> (all-ns)
(# # # # # # 
# # # # 
# # # # # # # # # # # # # # # # # # # 
# #)

user=> (resolve 'overtone.studio.inst)

ClassNotFoundException overtone.studio.inst  java.net.URLClassLoader$1.run 
(URLClassLoader.java:372)
user=> (ns-resolve *ns* 'overtone.studio.inst)

ClassNotFoundException overtone.studio.inst  java.net.URLClassLoader$1.run 
(URLClassLoader.java:372)
user=> (ns-resolve *ns* overtone.studio.inst)
CompilerException java.lang.ClassNotFoundException: overtone.studio.inst, 
compiling:(/private/var/folders/85/50nmp8fx3q72pxv4zlh_74pmgn/T/form-init5181314797293724962.clj:1:1)
 

user=> *ns*
#
user=> (namespace 'overtone.studio.inst)
nil
user=> (namespace overtone.studio.inst)

CompilerException java.lang.ClassNotFoundException: overtone.studio.inst, 
compiling:(/private/var/folders/85/50nmp8fx3q72pxv4zlh_74pmgn/T/form-init5181314797293724962.clj:1:1)
 


What am I doing wrong? 




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Re: load a namespace at repl?

[Fluid Dynamics]

On Tuesday, May 12, 2015 at 10:55:27 PM UTC-4, piast...@gmail.com wrote:
>
> If I: 
>
> git clone https://github.com/overtone/overtone.git
>
> cd overtone
>
> lein repl
>
> and then at the REPL, I try to load Overtone: 
>
>
> user=> (all-ns)
> (# # # clojure.stacktrace> # # clojure.java.browse> # 
> # # # clojure.main> # 
> # # # clojure.java.javadoc> # # clojure.repl> # # clojure.tools.nrepl.server> # # clojure.tools.nrepl.middleware> # # clojure.java.shell> # # clojure.tools.nrepl.transport> # clojure.tools.nrepl.middleware.interruptible-eval> # clojure.pprint> # # clojure.tools.nrepl.misc> # clojure.tools.nrepl.middleware.pr-values> # 
> # #)
>
> user=> (resolve 'overtone.studio.inst)
>
> ClassNotFoundException overtone.studio.inst  java.net.URLClassLoader$1.run 
> (URLClassLoader.java:372)
> user=> (ns-resolve *ns* 'overtone.studio.inst)
>
> ClassNotFoundException overtone.studio.inst  java.net.URLClassLoader$1.run 
> (URLClassLoader.java:372)
> user=> (ns-resolve *ns* overtone.studio.inst)
> CompilerException java.lang.ClassNotFoundException: overtone.studio.inst, 
> compiling:(/private/var/folders/85/50nmp8fx3q72pxv4zlh_74pmgn/T/form-init5181314797293724962.clj:1:1)
>  
>
> user=> *ns*
> #
> user=> (namespace 'overtone.studio.inst)
> nil
> user=> (namespace overtone.studio.inst)
>
> CompilerException java.lang.ClassNotFoundException: overtone.studio.inst, 
> compiling:(/private/var/folders/85/50nmp8fx3q72pxv4zlh_74pmgn/T/form-init5181314797293724962.clj:1:1)
>  
>
>
> What am I doing wrong? 
>

Looks like Overtone isn't in the classpath. I'd check the lein 
documentation for how to add a library to the classpath, or use a 
batteries-included IDE like CCW that has its own built-in library package 
manager and also manages things like classpaths for you. IME, in CCW using 
a new library is as simple as add it to project.clj dependencies, wait for 
CCW to finish auto-downloading stuff, and then launch REPL.

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Re: load a namespace at repl?

[Sean Corfield]

On Tue, May 12, 2015 at 7:55 PM,  wrote:

> If I:
>
> git clone https://github.com/overtone/overtone.git
>
> cd overtone
>
> lein repl
>
> and then at the REPL, I try to load Overtone:
> ...
> user=> (resolve 'overtone.studio.inst)
>

You want require, not resolve, in order to load the namespace.

Depending on exactly what you want to do, you may want:

(require '[overtone.studio.inst :refer :all])

which will load the namespace and import all of its symbols into the user
namespace.
-- 
Sean A Corfield -- (904) 302-SEAN
An Architect's View -- http://corfield.org/
World Singles, LLC. -- http://worldsingles.com/

"Perfection is the enemy of the good."
-- Gustave Flaubert, French realist novelist (1821-1880)

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Re: load a namespace at repl?

[Ian Truslove]

On Tue, May 12, 2015 at 9:09 PM, Fluid Dynamics  wrote:

> On Tuesday, May 12, 2015 at 10:55:27 PM UTC-4, piast...@gmail.com wrote:
>>
>> If I:
>>
>> git clone https://github.com/overtone/overtone.git
>>
>> cd overtone
>>
>> lein repl
>>
>>
All you need to do is create a new lein project, and add the overtone
dependency to it. https://github.com/overtone/overtone/#installation has
the details, but in short:
   lein new my-music
then add [overtone "0.9.1"] to the :dependencies section of project.clj.

This is the standard way to use most libraries in your Clojure project.

-Ian.

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Need advice/idiom to reduce number of parameters in functions

[Chris Wong]

I have a set of functions that need a map of historic data.  Hence, this 
map gets passed along from function to function, usually several levels 
deep. In addition to the map, a reference date also frequently get passed 
along in 80% of the API.  Sometimes a third or fouth parameter is also 
passed along several layer in addition to function specific parameters. You 
got the idea. In OOP, these common function parameters usually are part of 
the object's attributes. In FP, I've seen them passed along individually or 
packaged up into a map or vector so that they are easy to pass along... 
sort of like a context object getting passed around.

What's the Clojure's way or FP way to improve this without having 5+ 
parameters in almost every function?

Thanks
Chris


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Re: Probabilistic programming anyone?

[Sunil S Nandihalli]

Hi Frank,
 I am looking forward to giving it a shot. I am familiar with and used
Stan. While I understand that stan may not as flexible. A comparison with
of Anglician with Venture and Stan would be very much appreciated. Thanks
for probabilistic-language embedded in clojure.

Sunil.

On Wed, May 13, 2015 at 1:16 AM,  wrote:

> Another question: is there a particular reason why the code of Anglican is
> hosted on BitBucket with read only access for outsider, whereas the
> examples are on Github? Does that mean that you do not anticipate
> contributions to the language from the outside? I saw the license is GPL
> though.
>
> On Tuesday, May 12, 2015 at 3:05:50 AM UTC-7, Frank Wood wrote:
>
>> I'm a professor at Oxford and my group has been working on a new embedded
>> language called Anglican:
>>
>> http://www.robots.ox.ac.uk/~fwood/anglican/
>>
>> It can be used to do advanced machine learning in Clojure (Java, etc.)
>> applications without having to know anything about inference or math.  For
>> example see:
>>
>> http://www.robots.ox.ac.uk/~fwood/anglican/examples/index.html
>>
>> My group would be very interested to get feedback on the language design
>> and its usefulness to the community.  Also, frankly, we could use your help
>> in taking it forward, where "help" largely means writing queries and
>> telling us what doesn't work.
>>
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Re: Probabilistic programming anyone?

[Steffen Dienst]

Neither the wiki, linked in the README at bitbucket 
referencing https://bitbucket.org/dtolpin/anglican/wiki, nor the issues, 
linked from the Anglican homepage 
referencing https://bitbucket.org/dtolpin/anglican/issues, is accessible. 
Both links present an "access denied" page.


Am Dienstag, 12. Mai 2015 12:05:50 UTC+2 schrieb Frank Wood:
>
> I'm a professor at Oxford and my group has been working on a new embedded 
> language called Anglican:
>
> http://www.robots.ox.ac.uk/~fwood/anglican/
>
> It can be used to do advanced machine learning in Clojure (Java, etc.) 
> applications without having to know anything about inference or math.  For 
> example see:
>
> http://www.robots.ox.ac.uk/~fwood/anglican/examples/index.html
>
> My group would be very interested to get feedback on the language design 
> and its usefulness to the community.  Also, frankly, we could use your help 
> in taking it forward, where "help" largely means writing queries and 
> telling us what doesn't work.
>

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