Symbolic expressions inside of array

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Bram van Eijnatten
Bram van Eijnatten 2021-4-14
评论： Bram van Eijnatten 2021-4-14
syms x
f(x) = x^2;
g(x) = x^3;
a = [f,g];
Imagine I have a code like this, and I wish to evaluate only f for a certain value, but not bring outside of the array. How can I do this? For instance, if now ask for a(3), matlab will output [9,27]. However, I want only want 9.

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采纳的回答

David Hill
David Hill 2021-4-14
syms x y
f = x^2;
g = y^3;
a = [f,g];
subs(a,x,3);
  2 个评论
Bram van Eijnatten
Bram van Eijnatten 2021-4-14
You answer gives me the output [9, y^3], whereas I want merely 9
Bram van Eijnatten
Bram van Eijnatten 2021-4-14
Never mind subs(a(1),x,3) gives the answer, thanks!

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