[sympy] Re: pattern replacement for complex numbers and manual factorization

As you have a string representation of your object, a non-sympy way is by using string regex: In [1]: expr = eval("Add(Mul(Integer(-1), Integer(2), Symbol('g'), Symbol('psi^ss_1'), conjugate(Symbol('psi^ss_1'))), Mul(Integer(-1), Integer(2), Symbol('g'), Symbol('psi^ss_2'), conjugate(Symbol('p

[sympy] Re: pattern replacement for complex numbers and manual factorization

A better alternative: In [1]: from sympy import * In [2]: expr = eval("Add(Mul(Integer(-1), Integer(2), Symbol('g'), Symbol('psi^ss_1'), conjugate(Symbol('psi^ss_1'))), Mul(Integer(-1), Integer(2), Symbol('g'), Symbol('psi^ss_2'), conjugate(Symbol('psi^ss_2'))), Symbol('omega_2'), Mul(Integer(

[sympy] Re: New user question: Expanding quotients of complex numbers

On Friday, June 6, 2014 2:36:34 AM UTC+2, jeanbi...@gmail.com wrote: > > > var('A,B,C,D,u,v,qi,qf') > qi = 1/(u-I*v) > qf = (A+B/qi)/(C+D/qi) > First of all, you don't need to declare *qi* and *qf* in var( ... ), because they get overwritten in the next expressions. By the way, maybe you mean

[sympy] Re: pattern replacement for complex numbers and manual factorization

Tnx! I think there is an error in the line (unbalanced paranthesis): return node.xreplace ({e: S.One, conjugate(e): S.One})*abs(e)**2) Also, do you know how I can force the factorization of the 2*g to get 2*g(|psi1|**2 + |psi2|**2)? On Friday, June 6, 2014 10:45:37 AM UTC+2, F. B. wrote: > > A

[sympy] Re: pattern replacement for complex numbers and manual factorization

On Friday, June 6, 2014 12:22:14 PM UTC+2, Andrei Berceanu wrote: > > Tnx! > I think there is an error in the line (unbalanced paranthesis): > > return node.xreplace ({e: S.One, conjugate(e): S.One})*abs(e)**2) > > Yes, sorry, just remove the last parenthesis. > Also, do you know how I can fo

[sympy] Re: pattern replacement for complex numbers and manual factorization

That fixed the error, however, the problem is now if I apply this function to expressions like -2*g*conjugate(psi^ss_1)*conjugate(psi^ss_2) I get -2*g*conjugate(psi^ss_1)*Abs(psi^ss_2)**2 so it looks like the pattern matching is working overtime, since it should leave the expression unchanged

[sympy] Re: pattern replacement for complex numbers and manual factorization

The unflatten_mul function factorized the 2, but not the g, i.e. it returns 2(g*|psi1|**2 + g*|psi2|**2) instead of 2g*(|psi1|**2 + |psi2|**2) On Friday, June 6, 2014 1:07:26 PM UTC+2, F. B. wrote: > > > > On Friday, June 6, 2014 12:22:14 PM UTC+2, Andrei Berceanu wrote: >> >> Tnx! >> I think t

Re: [sympy] Re: pattern replacement for complex numbers and manual factorization

Hello. All the receipts in this dicussion look very interesting.Maybe all of this ones could be put in the official documentation. Christophe BAL 2014-06-06 13:34 GMT+02:00 Andrei Berceanu : > The unflatten_mul function factorized the 2, but not the g, i.e. it returns > > 2(g*|psi1|**2 + g*|p

Re: [sympy] Re: pattern replacement for complex numbers and manual factorization

I agree, this could be helpful to many people. But first let's make sure we iron out all the bugs. And then I suppose one could re-write the expressions in a more user-friendly form? What do you propose, Chris? On Friday, June 6, 2014 2:16:15 PM UTC+2, Christophe Bal wrote: > > Hello. > > All t

[sympy] Re: pattern replacement for complex numbers and manual factorization

Try to use this one: from sympy.unify import unify def to_abs(node): if not isinstance(node, Mul): return node zm1, zm2 = symbols('zm1, zm2') m = unify(node, zm1 * zm2 * conjugate(zm2), {}, variables=[zm1, zm2]) try: m = next(m) except: return node

[sympy] Re: pattern replacement for complex numbers and manual factorization

On Friday, June 6, 2014 1:34:04 PM UTC+2, Andrei Berceanu wrote: > > The unflatten_mul function factorized the 2, but not the g, i.e. it returns > > 2(g*|psi1|**2 + g*|psi2|**2) > > instead of > > 2g*(|psi1|**2 + |psi2|**2) > Try to do so: def get_unflattener(m): m_args = list(m.args)

[sympy] Help with Vector

Hello everyone, I have been working on a basic vector framework for sympy for some time now. I am still working on the classes for coordinate systems, so currently all operations occur in the _same_ frame. The PR for the code is here . To get you starte

[sympy] Re: New user question: Expanding quotients of complex numbers

On Friday, June 6, 2014 2:16:57 AM UTC-7, F. B. wrote: > > > > On Friday, June 6, 2014 2:36:34 AM UTC+2, jeanbi...@gmail.com wrote: >> >> >> var('A,B,C,D,u,v,qi,qf') >> qi = 1/(u-I*v) >> qf = (A+B/qi)/(C+D/qi) >> > > First of all, you don't need to declare *qi* and *qf* in var( ... ), > because

[sympy] Re: Help with Vector

On Friday, June 6, 2014 3:44:51 PM UTC+2, Sachin Joglekar wrote: > > > 1. How do I ensure methods like 'trigsimp' work with these classes? > Currently, passing a vector like *(sin(a)+cos(a))**2*i - j* to trigsimp > returns the correct answer mathematically, _but_ the instance is of type > Add

Re: [sympy] Re: pattern replacement for complex numbers and manual factorization

I have no special ideas to propose except to start with the examples in this discussion. Maybe different working methods can be shown. 2014-06-06 14:23 GMT+02:00 Andrei Berceanu : > I agree, this could be helpful to many people. But first let's make sure > we iron out all the bugs. > And then I

Re: [sympy] Re: pattern replacement for complex numbers and manual factorization

I think that SymPy needs a better term rewriting system. And also a better pattern matcher. -- 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 email to sympy+unsubscr...@googlegro

Re: [sympy] Re: pattern replacement for complex numbers and manual factorization

A easy to use treeview will be a great tool. No ? 2014-06-06 19:52 GMT+02:00 F. B. : > I think that SymPy needs a better term rewriting system. And also a better > pattern matcher. > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscrib

Re: [sympy] Re: pattern replacement for complex numbers and manual factorization

Well yes, but that doesn´t change the fact that in Mathematica I can just do expr /.{x_*Conj[x_] -> Abs[x]^2} and it just works! On Friday, June 6, 2014 8:59:56 PM UTC+2, Christophe Bal wrote: > > A easy to use treeview will be a great tool. No ? > > > 2014-06-06 19:52 GMT+02:00 F. B. >: > >> I

Re: [sympy] Re: pattern replacement for complex numbers and manual factorization

By the way, I just found another case where the modulus value squared substitution fails: a, b, c, d = symbols('a b c d') expr = a*b*conjugate(a)*conjugate(b) + c*d*conjugate(c)*conjugate(d) bottom_up(chain(rebuild, to_abs))(expr) --> a*conjugate(a)*Abs(b)**2 + c*conjugate(c)*Abs(d)**2 instead

[sympy] modify latex representation of user-defined function

I define a function gamma with the following code: from sympy import * x = Symbol('x') class gamma(Function): pass Its latex representation is print latex(gamma(x)) \Gamma\left(x\right) whereas I would like it to be \gamma\left(x\right) i.e. lowercase instead of capital. How can I achieve

[sympy] How can I call sympy by javascript with django / jquery or ajax

Hallo everybody, I'm sorry for this question, but I'm not realy familar with Python. Normally I'm working with PHP and JavaScript, but for my recent project I have to integrate some symbolic math to a webpage. In an Internet search, I came across Sympy. And sympy looks quite good. My problem loo

[sympy] Re: modify latex representation of user-defined function

On Friday, 6 June 2014 23:13:39 UTC+2, Andrei Berceanu wrote: > > I define a function gamma with the following code: > > from sympy import * > x = Symbol('x') > class gamma(Function): pass > > Its latex representation is > > print latex(gamma(x)) > > \Gamma\left(x\right) > > whereas I would like

[sympy] Re: How can I call sympy by javascript with django / jquery or ajax

On Friday, 6 June 2014 23:18:19 UTC+2, Peter wrote: > > Hallo everybody, > > I'm sorry for this question, but I'm not realy familar with Python. > Normally I'm working with PHP and JavaScript, but for my recent project I > have to integrate some symbolic math to a webpage. > In an Internet sear

Re: [sympy] Writing Documentation for GA module

The png math looks terrible on high resolution displays, so I am -1 for that reason. It's also less accessible (e.g., screen readers cannot do anything with it). I don't think 15 seconds is that bad. You will wait longer than that for a PDF to download. Aaron Meurer On Wed, Jun 4, 2014 at 8:49 A

Re: [sympy] Writing Documentation for GA module

Locally on my computer (i7, 6 cores, 3.2 GHz) it took 8 seconds for the mathjax to render. The pdf file (928 kB) took less than a second to load and display. I also agree that the png display looks really bad. On 06/06/2014 06:43 PM, Aaron Meurer wrote: The png math looks terrible on high res

Re: [sympy] Writing Documentation for GA module

Did that include time downloading the pdf from the internet? Aaron Meurer On Fri, Jun 6, 2014 at 6:13 PM, Alan Bromborsky wrote: > Locally on my computer (i7, 6 cores, 3.2 GHz) it took 8 seconds for the > mathjax to render. The pdf file (928 kB) took less than a second to load > and display. >

Re: [sympy] Writing Documentation for GA module

I am doing all check out of documentation locally. The pdf file (also rst and html) is on my computer. Note that I just upgraded my computer. Before (Amd Phenom II, 6 cores) the Mathjax took 15 seconds to render. On 06/06/2014 07:21 PM, Aaron Meurer wrote: Did that include time downloading

[sympy] Re: How can I call sympy by javascript with django / jquery or ajax

Hi Björn, In the meantime, I tried to install SympyGamma and the Google app engine, as it is described in the manual. Unfortunately I don't know now how I can check if everything works fine, because some steps were discribed for a localhost and not on a remote server. Until today, I've never d

Re: [sympy] Re: How can I call sympy by javascript with django / jquery or ajax

You might want to look at http://krum.rz.uni-mannheim.de/jas/ (Java Algebra System (JAS) Project) On 06/06/2014 08:16 PM, Peter wrote: Hi Björn, In the meantime, ItriedtoinstallSympyGammaandtheGoogleappengine,asitisdescribedinthemanual. UnfortunatelyIdon'tknownowhowIcancheckifeverythingworks

Re: [sympy] PRolog Equation Solving System

These are all issues that Harsh should be addressing in his GSoC project. Aaron Meurer On Wed, Jun 4, 2014 at 6:56 AM, F. B. wrote: > I had a look at SymPy, it looks like this: > > In [1]: solve(cos(3*x), x) > Out[1]: > ⎡π π⎤ > ⎢─, ─⎥ > ⎣6 2⎦ > > In [2]: solve(cos(n*x), x) > Out[2]: > ⎡ π 3⋅

[sympy] How can I call sympy by javascript with django / jquery or ajax

Peter! I dont understand what is it exactly that you want to do but still I would like to help. On 7 Jun 2014 06:00, "Alan Bromborsky" > wrote: > In the meantime, I tried to install SympyGamma and the Google app engine, > as it is described in the manual. Unfortunately I don't know now how I can

[sympy] Re: Convert from a system of linear equations to a matrix

I just answered this on gitter earlier today, but you can just take the jacobian of the system to get its matrix form. For example: In [1]: from sympy import * In [2]: a, b, c, d = symbols('a, b, c, d') In [3]: x1, x2, x3, x4 = symbols('x1:5') In [4]: x = Matrix([x1, x2, x3, x4]) In [5]: syst