Re: [sympy] Re: REMINDER: Google Summer of Code 2015

Hi Raniere, I have a proposal regarding CSymPy ruby wrappers. What are the orgs that I can apply to? *Regards,* *Abinash Meher* On Thu, Mar 26, 2015 at 7:04 PM, Raniere Silva wrote: > Hi Shivam, > > > I'm applying this year for GSoC and my proposal > > < > https://github.com/sympy/sympy/wiki/G

Re: [sympy] Re: REMINDER: Google Summer of Code 2015

Abinash, That project needs to be specifically sent to SciRuby. You can also send it to PSF and NumFOCUS, but SciRuby is the main one. Jason moorepants.info +01 530-601-9791 On Fri, Mar 27, 2015 at 12:14 AM, Abinash Meher < abinashdakshana...@gmail.com> wrote: > Hi Raniere, > > I have a propos

Re: [sympy] Re: 24 hours left for GSoC proposals

Thanks for the confirmation Jason Cheers Sumith On Fri, Mar 27, 2015 at 4:32 AM, Jason Moore wrote: > Sumith, > > I see yours under PSF and NumFOCUS. > > > Jason > moorepants.info > +01 530-601-9791 > > On Thu, Mar 26, 2015 at 3:59 PM, Sumith 1896 wrote: > >> Hello, >> Even I would like a co

Re: [sympy] Difference between fraction and as_numer_denom

Both fraction and as_numer_denom return (2x+2, sin(x)+1) for expression 2(x+1)/(sin(x)+1), i.e. they rewrite numerator and denominator. I suggest simple fix for fraction: substitute last line return Mul(*numer), Mul(*denom) with return Mul(*numer, evaluate=False), Mul(*denom, evaluate=False) For

Re: [sympy] Re: 24 hours left for GSoC proposals

Hi Jason, thanks for the confirmation Regards Luv Agarwal On Friday, March 27, 2015 at 4:32:04 AM UTC+5:30, Jason Moore wrote: > > Luv, I see your applications in the PSF and NumFOCUS. We do not have > access to SAGE (at least I don't) so you'll have to ask SAGE. > > > Jason > moorepants.info > +

Re: [sympy] Difference between fraction and as_numer_denom

That seems reasonable since fraction is allowing the expr to rewrite: >>> 2*e 2*(x + 1)/(x - 1) >>> fraction(_) (2*x + 2, x - 1) On Friday, March 27, 2015 at 4:28:28 AM UTC-5, Paul Royik wrote: > > Both fraction and as_numer_denom return (2x+2, sin(x)+1) for expression > 2(x+1)/(sin(x)+1), i.e.

Re: [sympy] Re: REMINDER: Google Summer of Code 2015

On Fri, Mar 27, 2015 at 1:25 AM, Jason Moore wrote: > Abinash, > > That project needs to be specifically sent to SciRuby. You can also send it > to PSF and NumFOCUS, but SciRuby is the main one. That's right. Ondrej -- You received this message because you are subscribed to the Google Groups

Re: [sympy] Re: REMINDER: Google Summer of Code 2015

On Fri, Mar 27, 2015 at 9:06 AM, Ondřej Čertík wrote: > On Fri, Mar 27, 2015 at 1:25 AM, Jason Moore wrote: >> Abinash, >> >> That project needs to be specifically sent to SciRuby. You can also send it >> to PSF and NumFOCUS, but SciRuby is the main one. > > That's right. I think you can probabl

Re: [sympy] Difference between fraction and as_numer_denom

Isn't this just because the Mul evaluates itself. I don't think it's actually fraction() that is rewriting things. Aaron Meurer On Fri, Mar 27, 2015 at 9:31 AM, Chris Smith wrote: > That seems reasonable since fraction is allowing the expr to rewrite: > 2*e > 2*(x + 1)/(x - 1) fraction

[sympy] Re: 24 hours left for GSoC proposals

I have submitted my proposal to PSF and NumFocus under the title "Sympy - Improving the series package and limits". Sartaj Singh -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an

Re: [sympy] GSoC 15: Improving Assumptions

Aaron, I've updated(Added more description about execution and added timeline) my proposal on wiki as well as on melange. Please have a look and let me know if it looks good. Sudhanshu Mishra. On Thu, Mar 2

Re: [sympy] GSoC 15: Improving Assumptions

I won't have a chance to look at this until after the deadline. Aaron Meurer On Fri, Mar 27, 2015 at 10:39 AM, Sudhanshu Mishra wrote: > Aaron, > > I've updated(Added more description about execution and added timeline) my > proposal on wiki as well as on melange. Please have a look and let me k

Re: [sympy] GSoC 15: Improving Assumptions

Ok no problem. We can discuss that later over here if you have any question for me. Sudhanshu Mishra On Fri, Mar 27, 2015 at 9:22 PM, Aaron Meurer wrote: > I won't have a chance to look at this until after the deadline. > > Aaron Meurer > > On Fri, Mar 27, 2015 at 10:39 AM, Sudhanshu Mishra >

[sympy] rsolve example symbol

I am attempting to rsolve a recursion and am having a problem. Doctoring up the first example the live window follows. Please note that I changed (n**2 + 3*n - 2) to (n**2 + 3*n - k) and then no output results. Is this because it won't handle parameters or am I supposed to do things differentl

[sympy] expanding powers of cos()

Hi, I'm relatively new to SymPy, and enjoying it so far. I'm trying to analyze the harmonics that result when a sinusoid goes through a non-linear system. I have an expression that includes powers of a cos() and I want to expand it using the sum/difference angle identities. So I want In [5

[sympy] Re: expanding powers of cos()

Hello, Jeremy. Try this: from sympy.simplify.fu import TR7 TR7(cos(x)**2) On Friday, March 27, 2015 at 8:36:43 PM UTC+2, Jeremy Holleman wrote: > > Hi, > > I'm relatively new to SymPy, and enjoying it so far. I'm trying to > analyze the harmonics that result when a sinusoid goes through a no

Re: [sympy] Difference between fraction and as_numer_denom

This dosn't seem reasonable. Expanding goes on the line Mul(*numer). Mul(*numer, evaluate=False) fixes things. On Friday, March 27, 2015 at 4:31:58 PM UTC+2, Chris Smith wrote: > > That seems reasonable since fraction is allowing the expr to rewrite: > > >>> 2*e > 2*(x + 1)/(x - 1) > >>> fraction

[sympy] Restore Poly from dict

Suppose I have following polynomial: poly= Poly(6*x**4*y**5 + 3*x*y**2,y,x) It's dictionary is poly.as_dict() # {(5, 4): 6, (2, 1): 3} How can I restore poly from dict? How do I know that (5, 4) - > (y, x) ? poly.free_symbols is set, so it is unordered. Is there any way to fetch that from Poly?

Re: [sympy] Difference between fraction and as_numer_denom

We need to just remove this automatic distribution of numbers. Until we do that, we will continue to have confusing behavior like this. See https://github.com/sympy/sympy/issues/4596 for more information. Aaron Meurer On Fri, Mar 27, 2015 at 1:47 PM, Paul Royik wrote: > This dosn't seem reasonab

Re: [sympy] Restore Poly from dict

It looks like Poly.from_dict will do it: In [6]: p = Poly(6*x**4*y**5 + 3*x*y**2,y,x) In [7]: p.as_dict() Out[7]: {(2, 1): 3, (5, 4): 6} In [8]: p.from_dict(p.as_dict(), y, x) Out[8]: Poly(6*y**5*x**4 + 3*y**2*x, y, x, domain='ZZ') The order of the generators is the same as the order in the Pol

[sympy] Re: expanding powers of cos()

Thanks! That did exactly what I want for cos**2. I would also like to reduce the power on higher order terms. I tried TR7() on cos(x)**3 and cos(x)**4 and it did not make any changes. From quick glance here (https://github.com/sympy/sympy/blob/master/sympy/simplify/fu.py), TR7 seems like th

[sympy] Re: expanding powers of cos()

Update - Some combination of TR7, TR8, and expand() seems to work for powers that I've tried. For example: In [5]: TR8(expand(TR8(cos(x)**7))) > Out[5]: 35*cos(x)/64 + 21*cos(3*x)/64 + 7*cos(5*x)/64 + cos(7*x)/64 But it's not clear to me how I would do that in a programmatic way. Jeremy O

Re: [sympy] Restore Poly from dict

Thank you. On Friday, March 27, 2015 at 9:55:21 PM UTC+2, Aaron Meurer wrote: > > It looks like Poly.from_dict will do it: > > In [6]: p = Poly(6*x**4*y**5 + 3*x*y**2,y,x) > > In [7]: p.as_dict() > Out[7]: {(2, 1): 3, (5, 4): 6} > > In [8]: p.from_dict(p.as_dict(), y, x) > Out[8]: Poly(6*y**5

Re: [sympy] Difference between fraction and as_numer_denom

I see now. On Friday, March 27, 2015 at 9:51:52 PM UTC+2, Aaron Meurer wrote: > > We need to just remove this automatic distribution of numbers. Until > we do that, we will continue to have confusing behavior like this. See > https://github.com/sympy/sympy/issues/4596 for more information. > >

[sympy] Re: expanding powers of cos()

What do you mean "how I would do that in a programmatic way"? On Friday, March 27, 2015 at 11:33:27 PM UTC+2, Jeremy Holleman wrote: > > Update - Some combination of TR7, TR8, and expand() seems to work for > powers that I've tried. For example: > > In [5]: TR8(expand(TR8(cos(x)**7))) >> Out[5]

Re: [sympy] meijerint.py: Sorting in _mul_as_two_parts, _rewrite2

Am 24.03.2015 um 22:29 schrieb Aaron Meurer: On Tue, Mar 24, 2015 at 4:36 AM, Joachim Durchholz wrote: Is Meijer heuristic? In that case, I think variation due to changed sort order would be expected. Yes, it uses a lot of pattern matching, which is heuristic in nature. I have tracked down

Re: [sympy] meijerint.py: Sorting in _mul_as_two_parts, _rewrite2

On Fri, Mar 27, 2015 at 5:26 PM, Joachim Durchholz wrote: > Am 24.03.2015 um 22:29 schrieb Aaron Meurer: >> >> On Tue, Mar 24, 2015 at 4:36 AM, Joachim Durchholz >> wrote: >>> >>> Is Meijer heuristic? In that case, I think variation due to changed sort >>> order would be expected. >> >> >> Yes, i

[sympy] Re: expanding powers of cos()

I just mean that if I'm trying to write a script and I want to reduce all of the powers of cos or sin, I'm not sure how I would code that, because I can't tell if there's a pattern of which calls need to be made in which order to reduce an arbitrary polynomial of trig functions. For my present

Re: [sympy] Re: expanding powers of cos()

I would take a look at the fu paper for more references on what these rules are supposed to be, but I suspect that this is a bug. Aaron Meurer On Fri, Mar 27, 2015 at 7:01 PM, Jeremy Holleman wrote: > I just mean that if I'm trying to write a script and I want to reduce all of > the powers of co

Re: [sympy] Re: expanding powers of cos()

I'll do that. Thanks to both of you for the help! On Friday, March 27, 2015 at 8:30:03 PM UTC-4, Aaron Meurer wrote: > > I would take a look at the fu paper for more references on what these > rules are supposed to be, but I suspect that this is a bug. > > Aaron Meurer > > On Fri, Mar 27, 20

Re: [sympy] Integrate over Union of Interval's

> Matthew... what do you think of the union of intervals as an alternative to the usual ranges in integrate/Integral? Seems like a decent plan. I haven't been actively working on stats in a while so I don't have strong opinions here. On Thu, Mar 26, 2015 at 6:50 PM, Aaron Meurer wrote: > I t