Breaking a function into components?

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Chris
Chris 2014-5-23
评论： Star Strider 2014-5-24
I have a function containing several variables which I am looking to pull from it the individual variables and their values. i.e. function =5x+3y+8z. I need to be able to extract from this, say just the x variable and its value, answer=5x. Thanks in advance

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采纳的回答

Star Strider
Star Strider 2014-5-23
You probably need to use the Symbolic Math Toolbox, especially if you have only one such equation. (The Symbolic Math Toolbox doesn’t work efficiently for iterative calculations.)
syms x y z
f = 5*x+3*y+8*z
% Set y=0 and z=0 (then simplify if necessary):
f1 = subs(f, {y,z},{0,0})
yields:
f1 =
5*x

更多回答（1 个）

George Papazafeiropoulos
Make a function named myfunc as follows:
%----------------------
function out=myfunc(a,vec)
out=a.*vec;
end
%----------------------
Then run the following code:
a=[5;3;8];
x=1;
y=2;
z=3;
vec=[x;y;z];
out=myfunc(a,vec)
I hope this is what you want...
  1 个评论
Chris
Chris 2014-5-24
Cheers George, not quite what i was looking for but I've got my answer now.

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