Why I got the error "Undefined operator '*' for input arguments of type 'function_handle"?

My code:

f=@(x)x+1
g=@(x)x*f+4
g(1)

Answer 1

[Stephen23]

You need to call the function f, like this:

g=@(x)x*f(x)+4

f is a function handle, not a numeric value. Function handles cannot be multiplied. Only when you call the function handle with its input does it return a numeric value, which can then be multiplied.

This is just like any other function in MATLAB:

5*sin     % error, because sin is a function not a value
5*sin(pi) % okay, the function sin returns a numeric value

[Dhrumil Patadia]

In this case what would be the difference between x * f(x) and x .* f(x)?