Don't know where my code is wrong and how to fix it

Answer 1

[Torsten]

Pi = sym(pi)

Pi = 

π

double(Pi)

ans = 3.1416

Pi = sym('pi')

Pi = 

π

double(Pi)

Error using symengine
Unable to convert expression containing symbolic variables into double array. Apply 'subs' function first to substitute values for variables.

Error in sym/double (line 868)
Xstr = mupadmex('symobj::double', S.s, 0);

You understand the difference ?

[Brendan Jozwiak]

Yes thank you so much