| FreeMat
    | 
Section: FreeMat Functions
The feval function executes a function using its name. The syntax of feval is 
[y1,y2,...,yn] = feval(f,x1,x2,...,xm)
 where f is the name of the function to evaluate, and xi are the arguments to the function, and yi are the return values.
Alternately, f can be a function handle to a function (see the section on function handles for more information).
Finally, FreeMat also supports f being a user defined class in which case it will atttempt to invoke the subsref method of the class. 
Here is an example of using feval to call the cos function indirectly.
--> feval('cos',pi/4)
ans = 
    0.7071 
Now, we call it through a function handle
--> c = @cos
c = 
 @cos
--> feval(c,pi/4)
ans = 
    0.7071 
Here we construct an inline object (which is a user-defined class) and use feval to call it
--> afunc = inline('cos(t)+sin(t)','t')
afunc = 
  inline function object
  f(t) = cos(t)+sin(t)
--> feval(afunc,pi)
ans = 
   -1.0000 
--> afunc(pi)
ans = 
   -1.0000 
In both cases, (the feval call and the direct invokation), FreeMat calls the subsref method of the class, which computes the requested function.