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function [stk,nwrk,txt,top]=f_abs(nwrk)
//!purpose
// scilab abs function translation
//!parameters
// - stk :
// On entry stk is a global variable of type list
// entries indexed from top-1+rhs:top give the definition of the rhs
// function input variables
//
// After execution stk(1:lhs) must contain the definition of the
// lhs returned variables
//
// stk entries have the following structure:
// stk(k)=list(definition,type_expr,type_var,nb_lig,nb_col)
//
// *definition may be:
// - a character string containing a Fortran expression with
// a scalar value ex:'a+2*b-3*c(1);
// - a character string containing a reference to the first
// entry of a Fortran array
// 'a' if a is a defined matrix
// 'work(iwn)' if variable is stored in the double
// precision working array work
// 'iwork(iiwn)' if variable is stored in the integer
// working array iwork
// remark: complex array are defined by a definition part
// with 2 elements (real and imaginary parts definition)
// *type_expr a character string: the expression type code (used
// to indicate need of parenthesis )
// '2' : the expression is a sum of terms
// '1' : the expression is a product of factors
// '0' : the expression is an atome
// '-1': the value is stored in a Fortran array
// *type_var a character string: codes the variable fortran type:
// '1' : double precision
// '0' : integer
// '10': character
//
// *nb_lig (, nb_col) : character strings:number of rows
// (columns) of the matrix
// des chaines de caracteres
// Copyright INRIA
//
// nwrk : this variable contain information on working arrays, error
// indicators. It only may be modified by call to scilab functions
// outname adderr getwrk
//
// txt : is a column vector of character string which contain the
// fortran code associated to the function translation if
// necessary.
// top : an integer
// global variable on entry
// after execution top must be equal to top-rhs+lhs
//!
nam='abs'
txt=[]
s2=stk(top)
v=s2(1)
it2=prod(size(v))-1
if it2==0 then
[stk,nwrk,txt,top]=f_gener(nam,nwrk,[s2(3),s2(3)])
else
error(nam+' of complex argument is not implemented')
end
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