Hello Reginald, I guess the cause of your problem is a missing definiton of the bounds of mc.
The CPLEX LP file format has a default lower bound of 0 for all variables without explicitely stated bounds. For details refer to "C.4 Bounds section" of glpk-4.44/doc/glpk.pdf. Take the following examples: minimize z: + mc subject to mc >= -3 bounds mc free end This will result in an objective value of -3. minimize z: + mc subject to mc >= -3 end This will result in an objective value of 0. Best regards Xypron -------- Original-Nachricht -------- > Datum: Wed, 1 Sep 2010 13:22:48 -0700 (PDT) > CC: [email protected] > Betreff: Re: [Help-glpk] Bug or confused user? > xypron, > > The example is a constrained, overdetermined L1 regression of a line, but > it doesn't converge to the correct values for mc & m000_000. Instead it > terminates w/ mc=0 and m000_000 = 1.42372e+09 and a large residual error. It > should converge to mc = -2.5e4 & m000_000 = 1.8e9. > -- GMX DSL SOMMER-SPECIAL: Surf & Phone Flat 16.000 für nur 19,99 €/mtl.!* http://portal.gmx.net/de/go/dsl _______________________________________________ Help-glpk mailing list [email protected] http://lists.gnu.org/mailman/listinfo/help-glpk
