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Re: [Help-glpk] Getting constraint slack values

From: Michael Hennebry
Subject: Re: [Help-glpk] Getting constraint slack values
Date: Fri, 30 Jan 2004 09:13:09 -0600 (CST)

On Fri, 30 Jan 2004, Ivan Luzzi wrote:

> I tried to get the slack value of a certain constraint.
> >From what I understood from the reference manual, the function
> Lpx_get_row_prim(lp, j) should return the value of the auxiliary variable
> associated
> To column j, i.e. the amount to transform the inequality in a equality
> constraint, that is exactly what slack is.
> But what I get instead, is the activity value of the whole constraint!
> Is there a mistake or is my interpretation wrong?

According to the documentation, the formula for a row variable does
not include a constant term.
To get the slack, take a difference with the appropriate bound.

Mike   address@hidden
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