FEVAL Evaluate a Function
Section: FreeMat Functions
Usage
Thefeval
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.
Example
Here is an example of usingfeval
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.