newfun add a name in the table of functions

## Syntax

    newfun(function_name, function_ptr)

## Arguments

function_name

  a character string, giving a valid function name

function_ptr

  a positive number with integer value (see below)

## Description

Utility function (for experts only).

Adds the name `function_name` in the table of functions known to the interpreter.

`function_ptr` is an integer `1000*fun+fin` where `fun` and `fin` are the internal coding of the primitive `function_name`.

This function may be useful to associate a primitive to a gateway called in `"gw_user.c"` (`fun=14`). Note however that the ilib_build function is a more easy way to extend Scilab with new functions based on C, C++ or Fortran code.

This function may also be used to add an alias or to rename to an existing primitive function.

Used with `funptr` and `clearfun` one can add an alias or rename an existing primitive function.

## Examples

         absptr=funptr("abs");// get the function_ptr associated with the abs function
         newfun("abs_bis",absptr) // create an alias of the abs function
         abs_bis(-1+%i)
         clearfun("abs") // remove abs as a known function

          //redefine abs
          function y=abs(x)
    	y=abs_bis(real(x));
          endfunction

         abs(-1+%i)

## See also

- clearfun
- funptr
- ilib_build