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FreeMat
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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.