[Help-glpk] Re: quadratic optimization

[Andrew Makhorin]

>If I want to minimize the absolute value of a variable, quadratic cost
>function is one way to solve this problem.  What others can be done to
>express an absolute value? 

Try addressing your question to sci.op-research. Help-glpk is not
the appropriate forum (help-glpk is about developing and using glpk,
not about teaching math programming).