All right! Thanks again. If later I would like to plot that integral(f(xi,Beta)*dxi) with Beta in the X axis, would it work?
El miércoles, 3 de mayo de 2017, 0:17:41 (UTC+2), Aaron Meurer escribió: > > If you use Integral() instead of integrate() it will keep the integral > unevaluated. Otherwise, it will try to compute it, and if it cannot compute > a closed-form expression, it will return an Integral object. > > Aaron Meurer > > On Tue, May 2, 2017 at 6:16 PM, Carlos Bouthelier Madre < > [email protected] <javascript:>> wrote: > >> 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]> 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]. >>>> 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/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] <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/59614cf0-8cc3-43c5-946a-af3058c7f770%40googlegroups.com >> >> <https://groups.google.com/d/msgid/sympy/59614cf0-8cc3-43c5-946a-af3058c7f770%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/1314821a-6f10-49b9-852f-e59852bc1536%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
