# Bug when adding ".doit()" after some symbol when working with Sympy browsing

• posted
0

@omz
Bug report

``````from sympy import re, im, E, I
from sympy import *
import numpy as np
x,y,z = symbols('x y z')
mat = Matrix([
[exp(I*x)*exp(I*z)* (1+cos(y))/2,
exp(I*z)*(-1/sqrt(2))*sin(y),
exp(-I*x)*exp(I*z)* (1-cos(y))/2],
[exp(I*x)*(1/sqrt(2))*sin(y),
cos(y),
exp(-I*x)*(-1/sqrt(2))*sin(y)],
[exp(I*x)*exp(-I*z)* (1-cos(y))/2,
exp(-I*z)*(1/sqrt(2))*sin(y),
exp(-I*x)*exp(-I*z)*(1+cos(y))/2]
])
vec = Matrix([1,0,0])

x1,y1,z1 = symbols('x1 y1 z1')
mat1 = Subs(mat,(x,y,z),(x1,y1,z1))
vec1 = Matrix([1,0,0])

a,b = symbols('a b')
PSI = cos(a/2)*(mat*vec) + sin(a/2)*exp(I*b)*(mat1*vec1) # XXX

pprint(mat1.doit()*vec)
``````

If I put ".doit()" after mat1 in the line commented by XXX
The app crashes
I dont know why ... :-(
Hope you can solve it, it is quite annoying

But in general I love Pythonista :-D

• posted
0

Please use triple backquote ````` to surround your pasted code so it shows up properly

Internal error.

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