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Scilab Help >> Advanced functions > feval

# feval

multiple evaluation

[z]=feval(x,y,f)
[z]=feval(x,f)

### Arguments

x,y

two vectors

f

a function or a character string (for Fortran or C call)

### Description

Multiple evaluation of a function for one or two arguments of vector type :

z=feval(x,f)

returns the vector z defined by z(i)=f(x(i))

z=feval(x,y,f)

returns the matrix z such as z(i,j)=f(x(i),y(j))

f is an external (function or routine) accepting on one or two arguments which are supposed to be real. The result returned by f can be real or complex. In case of a Fortran call, the function f must be defined in the subroutine fevaltable.c (in directory SCI/modules/differential_equations/src/c).

### Examples

deff('[z]=f(x,y)','z=x^2+y^2');
feval(1:10,1:5,f)
deff('[z]=f(x,y)','z=x+%i*y');
feval(1:10,1:5,f)
feval(1:10,1:5,'parab')   //See ffeval.f file
feval(1:10,'parab')
// For dynamic link (see example ftest in ffeval.f)
// you can use the link command (the parameters depend on the machine):

• evstr — evaluates Scilab expressions and concatenates their results
• horner — polynomial/rational evaluation
• execstr — execute Scilab code in strings
• external — Scilab Object, external function or routine