Replacing symbolic variable with function input

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Michal Walko
Michal Walko 2018-10-15
回答： Steven Lord 2018-10-15
Hi, I'm trying to replace my symbolic variable with whatever value is input into the function.
Here's some sample code:
function y=TestFunction(x)
syms G
y=G.^2
end
My result ends up having coefficients and is strictly in terms of G yet I can't figure out how to replace G with the input/function variable x. I tried doing subs but the documentation is a little confusing. I tried
x=G
y=subs(y)
as well as
x=G
subs(y,G,x)
I've probably gone through every possibility/variation of subs except the right one. I suspect it's painfully simple. Anyone have any ideas? I'm thinking there might be a way to do this without having G be symbolic but it eludes me.
Obviously the actual code is much longer but this is the issue summarized.
Thanks!

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回答（1 个）

Steven Lord
Steven Lord 2018-10-15
For your sample code, you don't need to use syms at all.
function y = TestFunction(x)
y = x.^2;
end
Show an example that's somewhat closer to your actual problem and we may be able to offer some suggestions.

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