syms to another .m file

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Kaylie
Kaylie 2025-2-22
回答： Walter Roberson 2025-2-22
How do you export your syms equation to a new/different .m file to be able to use the equation with parameters.

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采纳的回答

Walter Roberson
Walter Roberson 2025-2-22
Ran in:
As @Torsten says, you can just pass symbolic expressions as parameters.
However, you need to be careful about assumptions. All levels of MATLAB code share the same assumptions, and using syms on a variable resets assumptions.
syms x positive
assumptions
ans = 
f = sin(x)+x^2
f = 
testit(f, x)
ans = 
ans = Empty sym: 1-by-0
ans = 
ans = 
assumptions
ans = Empty sym: 1-by-0
function testit(f, var)
assumptions
syms x
assumptions
diff(f, x)
diff(f, var)
end

更多回答（1 个）

Torsten
Torsten 2025-2-22
编辑：Torsten 2025-2-22
Ran in:
Call the other .m-file with the syms-equation (or function) as input argument.
syms x
f = x.^2;
result = fun(f)
result = 
4
function result = fun(f)
syms x
result = subs(f,x,2);
end

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