Function generation error using python code in matlab

%% 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.

Answer 1

[Leepakshi]

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

[성현]

Thank you for letting me know.