MATLAB Function (Solving an Error)

Question

I have one file with the following code:

function fx=ff(x)
fx=x;

I have another file with the following code:

function g = Lapl         


        

Answer 1

Looks like what you're trying to do is create a function in the variable g. That is, you want the first line to mean,

"Let g(x) be a function that is calculated like this: ff(x)*exp(-s*x)",

rather than

"calculate the value of ff(x)*exp(-s*x) and put the result in g".

Solution

You can create a subfunction for this

function result = g(x)
  result = ff(x) * exp(-s * x);
end

Or you can create an anonymous function

g = @(x) ff(x) * exp(-s * x);

Then you can use g(a), g(b), etc to calculate what you want.