Function generation error using python code in matlab

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성현
성현 on 12 Nov 2025 at 8:52
Commented: 성현 on 19 Nov 2025 at 0:40
%% download sympy module
pe = pyenv;
exe = string(pe.Executable);
cmd1 = '"' + exe + '"' + " -m pip install --upgrade pip";
cmd2 = '"' + exe + '"' + " -m pip install sympy";
system(cmd1);
system(cmd2);
%% function generation
sp = py.importlib.import_module('sympy');
x = sp.symbols('x');
f = sp.Function('f');
y = f(x); % <-- error here
eq = sp.Eq(sp.diff(y,x,2)+3*y-1,0);
Hi, all.
I'm trying to make function with python code in matlab m-file.
But, when it carry on 'y=f(x)' code, make a error
'Python object is neither string nor unicode. Cannot return chars.'
and there is no object 'y' in workspace.
What should I edit to run this code properly.
Thanks.

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Accepted Answer

Leepakshi
Leepakshi on 17 Nov 2025 at 11:50
Hey,
When you call f(x), the result is a SymPy object, not a string or number. MATLAB cannot convert this to a native MATLAB type, so you must work with it as a Python object in MATLAB. Try converting it into MATLAB compatible datatype.
Thanks

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