feval (Matlab function) Function evaluation

## Matlab/Scilab equivalent

Matlab | Scilab
    feval
    evstr
    execstr

## Particular cases

One output:

  In this case Scilab evstr is an equivalent to feval, after modifying inputs such as in examples below.

More than one output:

  In this case Scilab execstr is an equivalent to feval, after modifying inputs such as in examples below.

## Examples

Matlab | Scilab
    y1 = feval(@cos, [0 1])   % function input is real
    y1 = feval(@abs, 1+%i)    % function input is not real
    [y1,y2] = feval(@size,1)
    y1 = feval([0 1], cos)   // function input is real
    y1 = evstr("abs(1+%i)")
    execstr("[y1,y2] = size(1)");