Chapter 4: Programming in Matlab - College of the Redwoods

334 Chapter 4 Programming in Matlab
That is, you specify the variable holding the function handle, followed by a comma
separated list of arguments in parentheses.
◮ Example 1. Create a function to emulate the behavior of the mathematical
function f(x) = 2x 2 − 3.
We use the syntax fhandle = @(arglist) expr to create and store a function
handle in the variable f.
>> f = @(x) 2*x^2 - 3
f =
@(x) 2*x^2 - 3
We now execute the function by specifying the function handle associated with
it, followed by a single argument (the input) in parentheses.
>> f(3)
ans =
15
However, note what happens when we pass an array as input to this function.
>> x=0:5
x =
0 1 2 3 4 5
>> f(x)
??? Error using ==> mpower
Matrix must be square.
Error in ==> @(x) 2*x^2 - 3
We’ve failed to make our function “array smart.” You cannot square a vector, as
we are reminded in the error message “Matrix must be square.” We need to use
array operators to make our anonymous function “array smart.”
>> f = @(x) 2*x.^2 -3
f =
@(x) 2*x.^2 -3