MATLAB: How to apply a multivariate function to each element of a vector

evaluatefunctionMATLABvector

This is not the real function I have problem with. But this one a good example of the problem I have.
 function [Y] = testf(a,b,c,X)
 Y=dot([a b],[c X]);
 end
a,b,c,d are previously determined scalar variables (real) and X a vector.
E.g.:
 a=1; b=2; c=3; X=[-10:1:10];
I want to evaluate function f to each element of X keeping a,b,c constant.
Something like this… But for X more generally.
 [testf(a,b,c,-10) testf(a,b,c,-9) testf(a,b,c,-8) ...]
Here is an example:
 >> a=1; b=2; c=3; X=[-10:1:10];
 >> testf(a,b,c,X)
 Error using dot (line 33)
 A and B must be same size.
 Error in testf (line 2)
 Y=dot([a b],[c X]);
I know where the error is, but any solution to this?

Best Answer

Something like this?
a=1; b=2; c=3; X=[-10:1:10];
fun = @(x) testf(a,b,c,x);
Y = arrayfun(fun,X);
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