Hi,
I am new to scheme. I am trying to run small programs from SICP on Dr. Racket.
This is my code:
(define (factorial n)
(if (= n 1) 1
(* n (factorial (- n 1)
(factorial 5)
It runs fine. When I click the "Step" Button, I get an error like this:
sequence-contract-violation: negativ
Thank you so much , it is really inspiring and helpful and will read
again and again.
Hope to change my style , which is basically no tests , and no
documentation and poor code organization .
On Thu, Sep 15, 2011 at 6:17 AM, Matthias Felleisen
wrote:
>
>
> For the past few months, I have been w
For the past few months, I have been writing a style guide for new Racket
PLTers. The current draft is available at
http://www.ccs.neu.edu/home/matthias/Style/style/
I had hoped to complete it a bit more and polish it a bit more, but this
discussion suggests that people might be interes
Are there any general "thoughts" written somewhere about the order of
arguments?
I find myself often calling functions and getting the order of the arguments
wrong.
(Maybe I just need to be more familiarized with them...)
[]'s
Rodolfo Carvalho
On Wed, Sep 14, 2011 at 19:00, Norman Gray wrote:
The srcloc struct is transparent. And the syntax/srcloc library helps
with some of these issues -- it contains coercions to each type of
source location (from any of the others), generic accessors for source
location fields, and conversion to strings.
Carl Eastlund
On Wed, Sep 14, 2011 at 2:47 P
On 2011-09-14 16:14:50 -0500, Jeremy Kun wrote:
>Are there any other significant naming conventions I may run across?
>perhaps using some of ~ @ $ ^ & . _ + = . Is it considered bad form to use
>full UTF characters in identifiers?
If you use Racket's OO facilities you'll see:
potato%
Hi all,
Start with the video of an installation piece at Ars Electronica:
http://vimeo.com/29037809
This was announced on the Fluxus mailing list (where I lurk):
http://lists.pawfal.org/pipermail/fluxus-pawfal.org/2011-September/004508.html
Fluxus is notable because it is built using the Mz/Dr
Jeremy, hello.
On 2011 Sep 14, at 22:14, Jeremy Kun wrote:
> Are there any other significant naming conventions I may run across? perhaps
> using some of ~ @ $ ^ & . _ + = . Is it considered bad form to use full UTF
> characters in identifiers?
I've asked this same question in the past, and t
Pronounce the "/" as "with", and it usually makes sense. Sometimes it's
for a variation of a behavior, or composition of behaviors, sometimes
it's just as shorthand for the word "with", and sometimes it's something
else. You might use "/" a little less often, now that you have keyword
argumen
As I get deeper and deeper into Racket I notice a lot of interesting
identifiers that seem to follow a naming convention, but I can't figure out
what the convention is.
For instance, extract-binding/single seems to use the slash to indicate that
it only returns a single value, as opposed to a list
On the command line I think I can use xrepl to expand syntax.
Would it be a lot of work to allow the macro stepper gui to be executed on its
own? If its feasible I'll make a bug report for it.
On 09/14/2011 02:37 PM, Ryan Culpepper wrote:
> Not directly, but you can build a script that uses 'exp
Not directly, but you can build a script that uses 'expand/step' or
'expand-module/step' from macro-debugger/stepper. You will need to set
the current namespace to something suitable for what you're expanding.
Ryan
On 09/14/2011 02:17 PM, Jon Rafkind wrote:
Is there a way to invoke the gui m
Is there a way to invoke the gui macro stepper from the command line?
_
For list-related administrative tasks:
http://lists.racket-lang.org/listinfo/users
The small tweaks to Racket for SICP
("http://www.neilvandyke.org/racket-sicp/";) stopped working with Check
Syntax at some point. Any pointers to how to quickly get it working again?
* If using "#lang planet neil/sicp", then the "Check Syntax" button no
longer appears.
* If using "SICP (PLa
I think the other part is historical and an artifact of backwards compatibility.
FWIW, I think the srcloc struct should be transparent or perhaps even
a prefab, which would negate the benefit below.
Robby
On Wed, Sep 14, 2011 at 1:31 PM, Danny Yoo wrote:
> I wanted to double check my understand
On Tue, Sep 13, 2011 at 8:03 AM, Noel Welsh wrote:
> That is not one expression, but several. Wrap it in a (begin ...) and
> it should work. I.e.
Yikes! Don't continue to encourage him to use process here.
At the very least, even the raw use of eval is probably safer than
what's being proposed.
I wanted to double check my understanding on why source locations have
several representations in Racket.
One of them is the srcloc structure:
http://docs.racket-lang.org/reference/exns.html#(def._((lib._racket/private/base..rkt)._srcloc))
But there's also the list and vector representations, all
As other people already said, this way of doing things is not the most "safe
and beautiful" way of getting what you need done.
If "long-code" is really long and important, I suggest investigating other
solutions.
As Eli pointed out there are many weird conventions to pay attention
depending on yo
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Hello there folks.
I am trying to build in-source scribble documentation for classes and
methods and I am a bit confused as to how to proceed. Usually to
provide the contract and documentation for a procedure I code the
following:
(provide/doc
(pro
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