Thanks for your message, Aaron! I restarted my computer and it worked, not having changed a thing, so.... problem solved!
I have another problem though, I have a function f(x) which I know has no primitive, but I want to define its integral from 0 to 2*pi, would python know what integrate(f(x),(x,0,2*pi)) means? Or, conversely, would it keep trying to get a primitive expression "indefinitely"? (I think this is what is happening) If so, does anybody know if there is another way to do this? In fact , what I have is f(x1,x2,...xi,xi+1,....xn,Beta) and I want to define the integral of that function in the xi variables from i=1 to n iteratively (n is a value, like 10) from i=1 to N, obtaining an expression exclusively on Beta (I say this just in case it makes harder the use of an hypothetic method that could solve my problem ) Thanks in advance!! El domingo, 30 de abril de 2017, 3:16:11 (UTC+2), Aaron Meurer escribió: > > Matrices can have expressions as elements. What does the code do when you > run it? It doesn't run for me because kron is not defined. > > Aaron Meurer > > On Sat, Apr 29, 2017 at 7:52 AM, Carlos Bouthelier Madre < > [email protected] <javascript:>> wrote: > >> Hi, I have just started using sympy and I don't really know how to make >> this work. I've got functions that should return a matrix (I don't know if >> that is possible) whose elements are expressions of symbolic variables. >> This is my code, I've made a logical analysis of it (in pseudo-code) and >> it should do what I want to, the issue is that I am neither used to sympy >> variables nor to python syntaxis, so I would really appreciate your help. >> >> from sympy import * >> from sympy import cos >> from sympy.tensor.array import Array >> from sympy import I, Matrix, symbols >> from sympy import init_printing >> from sympy import init_session >> >> >> from IPython.display import display, Math, Latex >> >> >> var('Tita1 Tita2 Tita3 Tita4 Tita5 Tita6 Beta eps', real=True) >> def delta(n): >> f='Tita'+str(n) >> return sqrt(cos(f)*cos(f)*eps*eps+1) >> >> def EF(i): >> return Matrix([[0,0],[0,2*delta(i)]]) >> >> ID=Matrix([[1,0],[0,1]]) >> >> def ExtDim(X,n): >> if n==1: >> return X >> else: >> return kron(ExtDim(X,n-1),ID) >> >> def n_energy(n): >> if n==1: >> return EF(n) >> else: >> return kron(ID,n_energy(n-1))+ExtDim(EF(n),n) #This should be a >> matrix >> >> >> Thanks in advance! >> >> -- >> 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 [email protected] <javascript:>. >> To post to this group, send email to [email protected] <javascript:> >> . >> Visit this group at https://groups.google.com/group/sympy. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/sympy/ea805a03-ad40-44e9-8b44-f9957536e192%40googlegroups.com >> >> <https://groups.google.com/d/msgid/sympy/ea805a03-ad40-44e9-8b44-f9957536e192%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > > -- 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/59614cf0-8cc3-43c5-946a-af3058c7f770%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
