How to import symbolic expressions from Python to MATLAB?
29 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Sayan Batabyal
le 21 Sep 2020
Commenté : Benedikt
le 30 Août 2023
One of my colleagues is using Python(more specifically SymPy) to generate a very big symbolic expression. Now, I want to perform some numerical computations on the expression in MATLAB. How can I export the expression from Python and import it in MATLAB?
0 commentaires
Réponse acceptée
Michael Croucher
le 27 Sep 2020
Modifié(e) : Michael Croucher
le 27 Sep 2020
Imagine your friend had a Python function that created that expression. Let's call it create_symbolic_expression() and put it into a file sympy_demo.py. My demonstration is likely to be more simple than the one you have in mind.
sympy_demo.py also contains a function that lambdify's this symbolic expression..that is, it creates a Python function in the variables x,y and z.
%This is the contents of sympy_demo.py
from sympy import lambdify
from sympy.abc import x,y,z
def create_symbolic_expression():
'''
This is a proxy for whatever code your friend has written but I'll keep it simple for this demo.
'''
expr = x+y+z
return(x+y+z)
def lambdify_expression(expr):
return(lambdify([x,y,z],expr))
We can now go to MATLAB, ensure sympy_demo.py is on your path and do
import py.sympy_demo.create_symbolic_expression
import py.sympy_demo.lambdify_expression
expr = create_symbolic_expression() %This is a Python object in MATLAB that represents the symbolic expression
myfunc = lambdify_expression(expr) %Turn it into a Python function that can be evaluated in MATLAB
We can now evaluate myfunc with numeric inputs
myfunc(1,2,3)
ans =
6
2 commentaires
Benedikt
le 30 Août 2023
The % character in sympy_demo.py produces an error. Use # for python comment.
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Call Python from MATLAB dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!