Re: [sage-devel] genus() for Function Fields

On Tue, Dec 13, 2011 at 3:57 PM, syd.lavas...@gmail.com wrote: > AFAIK, currently the function field object can not compute its genus > (see below). I'm thinking about adding this feature in following few > days. Now, there are two different approaches I can take, and I would > like to know which

Re: [sage-devel] timeit for mathematicians

On Tue, Dec 13, 2011 at 5:36 PM, Volker Braun wrote: > On Wednesday, December 14, 2011 12:18:58 AM UTC, Martin Albrecht wrote: >> >> It uses the "Student-t" method to estimate the certainty > > This is precisely what the python documentation warns about (see Nils' > post). The timings are not norm

Re: [sage-devel] Re: Sage Android App

On Tue, Dec 13, 2011 at 9:04 PM, Rob Beezer wrote: > On Dec 13, 6:44 pm, kcrisman wrote: >> More seriously, selling it for $.99 or something wouldn't be a bad >> idea (?) or at least making a contribution possible to do. > > My impression is that the Android user culture is much more inclined > t

Re: [sage-devel] Mathematica/Magma/Sage dictionaries ?

On Tue, Dec 13, 2011 at 4:36 PM, Dan Drake wrote: > On Wed, 14 Dec 2011 at 12:51AM +0100, Nathann Cohen wrote: >> I have been contacted by an enlightened colleague who planned to teach a >> bit of Sage at the local university, instead of Magma and Mathematica as it >> was formerly done. Now, enthu

Re: [sage-devel] Re: Mathematica/Magma/Sage dictionaries ?

On Tue, 2011-12-13 at 18:15 -0600, Jason Grout wrote: > On 12/13/11 5:51 PM, Nathann Cohen wrote: > > Hello everybody !!! > > > > I have been contacted by an enlightened colleague who planned to teach a > > bit of Sage at the local university, instead of Magma and Mathematica as > > it was formerly

[sage-devel] Re: Sage Android App

On Dec 13, 6:44 pm, kcrisman wrote: > More seriously, selling it for $.99 or something wouldn't be a bad > idea (?) or at least making a contribution possible to do. My impression is that the Android user culture is much more inclined to expect free (as in zero cost). Or conversely (or is it equ

Re: [sage-devel] Re: strange ECL RunTimeError when integrating

On Tue, 13 Dec 2011 at 06:38PM -0800, kcrisman wrote: > > Proposed bugfix: symbolic integration should reject floats. > > Yikes! So we wouldn't want > > sage: integrate(1.0*x,x,0,2) > 2 > > to work any more? (Pace the error messages below.) > > Could we not instead try to catch this kind of

[sage-devel] Re: [sage-release] Re: sage-4.8.alpha1 released

On Fri, Nov 18, 2011 at 8:48 AM, Christian Stump wrote: > Build on Ubuntu 11.10 and had two problems: > > The first was recorded on http://trac.sagemath.org/sage_trac/ticket/11970, > it is still there and it took me some time to find it... I'm bumping trac 11970 to a blocker. The current situati

[sage-devel] Re: Sage Android App

> Hehe...how about a startup that sells "Sage Graphing Calculators" for > only $699 or something? More seriously, selling it for $.99 or something wouldn't be a bad idea (?) or at least making a contribution possible to do. See this iTunes app by a "friend of Sage" - http://itunes.apple.com/us

[sage-devel] Re: strange ECL RunTimeError when integrating

> Conjecture: The integration error occurs due to a similar problem, but > in a less shielded way, so we get a less intelligible error message > about essentially the same problem. > > From a maxima perspective, I don't think anymore this really is an > error. I don't think you can expect the adva

[sage-devel] Re: Mathematica/Magma/Sage dictionaries ?

On Tuesday, December 13, 2011 3:51:19 PM UTC-8, Nathann Cohen wrote: > > Hello everybody !!! > > I have been contacted by an enlightened colleague who planned to teach a > bit of Sage at the local university, instead of Magma and Mathematica as it > was formerly done. Now, enthusiasm is a wonde

[sage-devel] Re: Mathematica/Magma/Sage dictionaries ?

On Tuesday, December 13, 2011 3:51:19 PM UTC-8, Nathann Cohen wrote: > > Hello everybody !!! > > I have been contacted by an enlightened colleague who planned to teach a > bit of Sage at the local university, instead of Magma and Mathematica as it > was formerly done. Now, enthusiasm is a wonderf

[sage-devel] Re: strange ECL RunTimeError when integrating

On Dec 13, 4:09 pm, Dan Drake wrote: > ...especially when the float is 1.5, which can be represented exactly as > a binary float! Actually, I think it is by design that "integrate" does not work right when "keepfloat: true;". The routine "crecip" (reciprocal modulo "modulus") relies one dynamical

Re: [sage-devel] timeit for mathematicians

On Wednesday, December 14, 2011 12:18:58 AM UTC, Martin Albrecht wrote: > > It uses the "Student-t" method to estimate the certainty > This is precisely what the python documentation warns about (see Nils' post). The timings are not normal distributed. Especially if your code is deterministic it

Re: [sage-devel] Re: strange ECL RunTimeError when integrating

On Tue, 13 Dec 2011 at 06:48AM -0800, kcrisman wrote: > Can you open a ticket and cc: me? This is now http://trac.sagemath.org/sage_trac/ticket/12152 Dan -- --- Dan Drake - http://mathsci.kaist.ac.kr/~drake --- signature.asc Description: Digital signature

Re: [sage-devel] Re: timeit for mathematicians

Hi, > For low level assembly language we sometimes compute the exact number > of cycles using the cycle counter rather than do a timing. This varies > per architecture and assumes cache affects are not relevant. I remember doing that on a 6502 or 8086/80286/80386. I'm curious: Is it still r

Re: [sage-devel] Mathematica/Magma/Sage dictionaries ?

On Wed, 14 Dec 2011 at 12:51AM +0100, Nathann Cohen wrote: > I have been contacted by an enlightened colleague who planned to teach a > bit of Sage at the local university, instead of Magma and Mathematica as it > was formerly done. Now, enthusiasm is a wonderful thing that can achieve > many thing

Re: [sage-devel] timeit for mathematicians

On Tuesday 13 December 2011, William Stein wrote: > Thoughts?Are there any experts out there in code benchmarking done > from a more mathematically sophisticated perspective than just one > number? It's entirely possible I'm making some stupid mistake in > suggesting the above. Carlo Wood

[sage-devel] Re: Mathematica/Magma/Sage dictionaries ?

On 12/13/11 5:51 PM, Nathann Cohen wrote: Hello everybody !!! I have been contacted by an enlightened colleague who planned to teach a bit of Sage at the local university, instead of Magma and Mathematica as it was formerly done. Now, enthusiasm is a wonderful thing that can achieve many things

Re: [sage-devel] Re: strange ECL RunTimeError when integrating

On Tue, 13 Dec 2011 at 11:27AM -0800, Nils Bruin wrote: > I think the error is triggered by an actual bug in "rationalize" > somewhere, so it might be worth reporting the error upstream. There is > no reason why "replace a float by a nearby rational number" should > ever fail. ...especially when t

[sage-devel] genus() for Function Fields

AFAIK, currently the function field object can not compute its genus (see below). I'm thinking about adding this feature in following few days. Now, there are two different approaches I can take, and I would like to know which one is more desirable for Sage community: 1. Sage can use singular to c

[sage-devel] Mathematica/Magma/Sage dictionaries ?

Hello everybody !!! I have been contacted by an enlightened colleague who planned to teach a bit of Sage at the local university, instead of Magma and Mathematica as it was formerly done. Now, enthusiasm is a wonderful thing that can achieve many things by itself, and for instance to the scary tas

Re: [sage-devel] Re: timeit for mathematicians

On 13 December 2011 21:39, William Stein wrote: > On Tue, Dec 13, 2011 at 1:15 PM, Nils Bruin wrote: >> I recall reading something about that in the Python documentation and >> indeed, quoting from >> >> http://docs.python.org/library/timeit.html >> >> we find: >> >> """ >> Note >> >> It’s tempti

[sage-devel] Re: timeit for mathematicians

Hi! Currently, "timeit" often does not more than finding the "best of three". I suspect that computing a standard deviation from just three samples is not quite reliable. Hence, if one wants to get a statistic then one needs a lot more runs, thus, the test will take much more time. Do we want tha

Re: [sage-devel] Re: openssh versus gnutls

On Dec 13, 2011, at 11:14 , Volker Braun wrote: > Since libSystem.B.dylib is a os library we shouldn't have to care. Also, I > don't think apple ships openssl since its not featured in apple ads ;-) Well, if you do "apropos openssl", you get a bunch of stuff printed. If you look in "/usr/incl

Re: [sage-devel] Re: timeit for mathematicians

On Tue, Dec 13, 2011 at 1:41 PM, Nathann Cohen wrote: >> we find: > > Yep, but it looks like they have a purely deterministic algorithm in mind. I > often do things like that : > > graphs.RandomGNP(10,.2) .chromatic_number() > > Well, the "chromatic_number()" method is deterministic, but each time

[sage-devel] Re: timeit for mathematicians

> > we find: > Yep, but it looks like they have a purely deterministic algorithm in mind. I often do things like that : graphs.RandomGNP(10,.2) .chromatic_number() Well, the "chromatic_number()" method is deterministic, but each time this method is run it is run on a different random graph. %

Re: [sage-devel] Re: timeit for mathematicians

On Tue, Dec 13, 2011 at 1:15 PM, Nils Bruin wrote: > I recall reading something about that in the Python documentation and > indeed, quoting from > > http://docs.python.org/library/timeit.html > > we find: > > """ > Note > > It’s tempting to calculate mean and standard deviation from the result >

[sage-devel] Re: timeit for mathematicians

I recall reading something about that in the Python documentation and indeed, quoting from http://docs.python.org/library/timeit.html we find: """ Note It’s tempting to calculate mean and standard deviation from the result vector and report these. However, this is not very useful. In a typical

Re: [sage-devel] Re: Problem calling a base-class cached method from an overridden derived class cached method

On Fri, Dec 09, 2011 at 03:18:35PM -0800, Simon King wrote: > The point is: If A.foo is a cached method and B.foo is another cached > method that overrides A.foo but calls it via "super(B,self).foo", then > the two cached methods would share their caches, thus, would > potentially shoot themselves

[sage-devel] Re: timeit for mathematicians

On 12/13/11 2:34 PM, William Stein wrote: Hi, I was just looking at some timings for trac 12149, and it occurred to me that our "timeout" command may be fine for programmers, but for us mathematicians surely we want something that gives a better measure of the distribution of timings? Wouldn't

[sage-devel] Re: Sage Android App

On 12/13/11 2:23 PM, William Stein wrote: On Tue, Dec 13, 2011 at 7:06 AM, Volker Braun wrote: I wrote this in one day so don't expect a polished product. But you can type in stuff and have it evaluated by the single cell server :-) If you want to give it a spin you can get it at http://www.st

[sage-devel] timeit for mathematicians

Hi, I was just looking at some timings for trac 12149, and it occurred to me that our "timeout" command may be fine for programmers, but for us mathematicians surely we want something that gives a better measure of the distribution of timings? Wouldn't it be nice to get both the mean and standard

Re: [sage-devel] Sage Android App

On Tue, Dec 13, 2011 at 7:06 AM, Volker Braun wrote: > I wrote this in one day so don't expect a polished product. But you can type > in stuff and have it evaluated by the single cell server :-) If you want to > give it a spin you can get it at > > http://www.stp.dias.ie/~vbraun/Sage/Sage.apk > >

[sage-devel] Re: strange ECL RunTimeError when integrating

On Dec 13, 8:27 pm, Nils Bruin wrote: > On Dec 13, 11:07 am, kcrisman wrote: > > > Yes, we try to turn it off as much as possible - > > seehttp://hg.sagemath.org/sage-main/file/9e29a3d84c48/sage/interfaces/ma... > > and the keepfloat:true.  What an unhelpful error message, then! > > I think th

Re: [sage-devel] Re: openssh versus gnutls

On Tue, Dec 13, 2011 at 11:14 AM, Volker Braun wrote: > Since libSystem.B.dylib is a os library we shouldn't have to care. Also, I > don't think apple ships openssl since its not featured in apple ads ;-) > > Question for notebook developers: Do we actually use python's ssl module? > The notebook

Re: [sage-devel] Re: Sage Android App

Eclipse project is here: http://www.stp.dias.ie/~vbraun/Sage/SageApp.tar.bz2 -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.googl

[sage-devel] Re: strange ECL RunTimeError when integrating

On Dec 13, 11:07 am, kcrisman wrote: > Yes, we try to turn it off as much as possible - > seehttp://hg.sagemath.org/sage-main/file/9e29a3d84c48/sage/interfaces/ma... > and the keepfloat:true.  What an unhelpful error message, then! I think the error is triggered by an actual bug in "rationalize"

Re: [sage-devel] Re: Sage Android App

Can I see the source? On Dec 13, 2011 10:17 AM, "Rob Beezer" wrote: > > > On Dec 13, 7:06 am, Volker Braun wrote: > > I wrote this in one day so don't expect a polished product. > > Volker, > > Very, very nice! With the settings change suggested, I just entered > the provided URL into the web b

[sage-devel] Re: openssh versus gnutls

Since libSystem.B.dylib is a os library we shouldn't have to care. Also, I don't think apple ships openssl since its not featured in apple ads ;-) Question for notebook developers: Do we actually use python's ssl module? The notebook code seems to have gnutls support, see e.g. sagenb/notebook/g

[sage-devel] Re: strange ECL RunTimeError when integrating

> The problem arises from the rational approximation that maxima tries > to do resulting from 1.5. Given that the maxima console seems to do > this "right", my guess would be that we turn off this rational > approximation trick and that it gets triggered later, resulting in Yes, we try to turn it

[sage-devel] Re: openssh versus gnutls

On 12/13/11 12:38 PM, Volker Braun wrote: If openssl libraries are available then Python will also build the ssl module (which does link libcrypto), but this is not required for Sage. Can the ssl module be built without OpenSSL? As the first thing in our instructions to install the new notebo

Re: [sage-devel] openssh versus gnutls

At least on my machine python's crypt module links against glibc's libcrypt, not openssl libcrypto (note the o at the end). If openssl libraries are available then Python will also build the ssl module (which does link libcrypto), but this is not required for Sage. The error you got is triggere

[sage-devel] Re: strange ECL RunTimeError when integrating

The bug can be triggered via the pexpect interface to maxima, so it probably has something to do with the things that sage preloads in maxima: sage: maxima("integrate(sin(t)^2/(1*cos(t) + 1.5)^2,t,0,2*%pi)") TypeError: Error executing code in Maxima CODE: sage1 : integrate(sin(t)^2/(1*cos(

[sage-devel] Re: openssh versus gnutls

On 12/13/11 12:10 PM, William Stein wrote: > Why is it a problem for the user to link GPL software with openSSL on their own system? We aren't distributing, they aren't distributing it (unless they are making a binary for someone, I guess---that might be a big problem). > We are distributing.

[sage-devel] Re: Sage Android App

On Dec 13, 7:06 am, Volker Braun wrote: > I wrote this in one day so don't expect a polished product. Volker, Very, very nice! With the settings change suggested, I just entered the provided URL into the web browser and the installation went smoothly from there. And I was off and running row

Re: [sage-devel] Re: openssh versus gnutls

On Dec 13, 2011 10:06 AM, "Jason Grout" wrote: > > On 12/13/11 12:00 PM, William Stein wrote: >> >> >> On Dec 13, 2011 1:12 AM, "Jan Groenewald" > > wrote: >> > >> > Hi William >> > >> > On 13 December 2011 10:30, William Stein > > wrote: >> >>

[sage-devel] Re: openssh versus gnutls

On 12/13/11 12:00 PM, William Stein wrote: On Dec 13, 2011 1:12 AM, "Jan Groenewald" mailto:j...@aims.ac.za>> wrote: > > Hi William > > On 13 December 2011 10:30, William Stein mailto:wst...@gmail.com>> wrote: >> >> Hi Sage-devel, >> >> I just tried building Sage on Linux Mint 12, and it

Re: [sage-devel] openssh versus gnutls

On Dec 13, 2011 1:12 AM, "Jan Groenewald" wrote: > > Hi William > > On 13 December 2011 10:30, William Stein wrote: >> >> Hi Sage-devel, >> >> I just tried building Sage on Linux Mint 12, and it fails when >> building Python with: >> >> ... >> math module imported OK >> hashlib module imported OK

[sage-devel] Re: strange ECL RunTimeError when integrating

> Maxima 5.25.1 > > (%i2) display2d:false; > (%o2) false > (%i3) h:sin(t)^2/(cos(t)+1.5)^2; > (%o3) sin(t)^2/(cos(t)+1.5)^2 > (%i4) integrate(h,t,0,2*%pi); > > rat: replaced 1.5 by 3/2 = 1.5 > > rat: replaced 1.5 by 3/2 = 1.5 > > rat: replaced 1.5 by 3/2 = 1.5 > > rat: replaced 1.5 by 3/2 = 1.5 >

[sage-devel] Re: Sage Android App

Whoa thats quite a lot of code. Is there more of a story behind it? You implemented everything including an aidl to have the most general multithreaded ipc between android apps but then you ran out of steam when it came to interfacing with the Sag server? Or did you hit some particular problem?

[sage-devel] Linear Algebra Quickref updated

I have updated the Linear Algebra Quick Reference card to more closely match version 4.8 and to catch up on 2.5 years worth of changes. You can find it (and others) at: http://wiki.sagemath.org/quickref Rob -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe

[sage-devel] Re: strange ECL RunTimeError when integrating

On Dec 13, 3:48 pm, kcrisman wrote: > On Dec 12, 10:11 pm, Dan Drake wrote: > > > > > I'm doing some integrals: > > > sage: a, b, t = var('a b t') > > sage: f(a,b,t) = sin(t)^2/(a + b*cos(t))^2 > > sage: integrate(f(3/2,1,t), (t,0,2*pi)) > > -2/5*(sqrt(5) - 3)*pi*sqrt(5) > > > Okay, that's fine

[sage-devel] Re: Sage Android App

I started this some time ago: http://code.google.com/p/sage-android/ Might be cool to replace its non-working backend by your cell evaluation code! H -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@g

[sage-devel] Sage Android App

I wrote this in one day so don't expect a polished product. But you can type in stuff and have it evaluated by the single cell server :-) If you want to give it a spin you can get it at http://www.stp.dias.ie/~vbraun/Sage/Sage.apk You may have to enable Settings->Application->Unknown Sources to

[sage-devel] Re: strange ECL RunTimeError when integrating

On Dec 12, 10:11 pm, Dan Drake wrote: > I'm doing some integrals: > > sage: a, b, t = var('a b t') > sage: f(a,b,t) = sin(t)^2/(a + b*cos(t))^2 > sage: integrate(f(3/2,1,t), (t,0,2*pi)) > -2/5*(sqrt(5) - 3)*pi*sqrt(5) > > Okay, that's fine. But > > sage: integrate(f(1.5,1,t), (t,0,2*pi)) > > blo

Re: [sage-devel] importing mpmath in 'sage -python' imports "everything"?

On Tue, Dec 13, 2011 at 12:25 PM, Jonathan Bober wrote: > That doesn't seem to work. (I haven't tried to figure out what the problem > is, and I think I'm going to sleep soon instead of trying to figure it out > right now.) > > I think that it doesn't do the imports, but then later it tries to use

Re: [sage-devel] importing mpmath in 'sage -python' imports "everything"?

That doesn't seem to work. (I haven't tried to figure out what the problem is, and I think I'm going to sleep soon instead of trying to figure it out right now.) I think that it doesn't do the imports, but then later it tries to use them. bober@sage:~$ MPMATH_NOSAGE=1 sage -python -c "import mpma

Re: [sage-devel] openssh versus gnutls

And that the command dpkg-architecture is in the package dpkg-dev. Regards, Jan On 13 December 2011 12:46, Volker Braun wrote: > I also tripped over this yesterday. It would have been nice if the error > message would have included the information that dpkg-architecture is not > installed by

[sage-devel] Re: How to write a Cython wrapper for a C++ function that has a function pointer argument

Well a Python function does not have a function pointer, only C functions do. You can wrap some canned C callbacks or have a cdef function callback that communicates with Python. Whats best really depends on what the callback does. -- To post to this group, send an email to sage-devel@googlegr

Re: [sage-devel] openssh versus gnutls

I also tripped over this yesterday. It would have been nice if the error message would have included the information that dpkg-architecture is not installed by default and you almost certainly have to install it yourself. -- To post to this group, send an email to sage-devel@googlegroups.com To

Re: [sage-devel] Re: Representation of finite field elements

On 2011-12-12 15:27, Johan S. R. Nielsen wrote: > That is, change default from repr="poly" to repr="log"? -1. log is computationally difficult if the field gets large. And having a different default for small and large finite fields would only be confusing. Also, "poly" clearly shows elements of

Re: [sage-devel] importing mpmath in 'sage -python' imports "everything"?

On Tue, Dec 13, 2011 at 8:27 AM, Jonathan Bober wrote: > Does anyone happen to know why this happens? I have a feeling it is going to > annoy my sometime soon. You can prevent mpmath from trying to import Sage altogether by setting the MPMATH_NOSAGE environment variable. Of course, this makes the

[sage-devel] Re: Representation of finite field elements

Wow, this opened up a can of worms I hadn't expected, but reading your comments, I really agree. > When I was working on similar issues for printing real numbers (i.e., > whether to truncate digits, etc.), Carl Witty brought up a very good > point. Printing representation options should be global

Re: [sage-devel] openssh versus gnutls

Hi William On 13 December 2011 10:30, William Stein wrote: > Hi Sage-devel, > > I just tried building Sage on Linux Mint 12, and it fails when > building Python with: > > ... > math module imported OK > hashlib module imported OK > Traceback (most recent call last): > File "", line 1, in > Imp

[sage-devel] openssh versus gnutls

Hi Sage-devel, I just tried building Sage on Linux Mint 12, and it fails when building Python with: ... math module imported OK hashlib module imported OK Traceback (most recent call last): File "", line 1, in ImportError: No module named crypt crypt module failed to import Error: One or more