Re: [Help-glpk] GLPKConstants - legend

[Xypron]

Hello Jana,

GLPK for Java downloadable from http://glpk-java.sourceforge.net
is compiled from GLPK using package Swig for code generation.

Some examples are given in directory examples/java of GLPK for Java. You 
will find a short description in doc/glpk-java.pdf.

All constants of Java class org.gnu.glpk.GLPKConstants are derived form 
values in include/glpk.h of the source distribution of GLPK available at 
ftp://ftp.gnu.org/gnu/glpk

All C functions of GLPK (which are mapped to methods of class 
org.gnu.glpk.GLPK in Java) are explained in the GLPK manual 
(doc/glpk.pdf), e.g.

2.9.1 glp set col kind—set (change) column kind
Synopsis
void glp_set_col_kind(glp_prob *mip, int j, int kind);
Description
The routine glp_set_col_kind sets (changes) the kind of j-th column
(structural variable) as specified by the parameter kind:
GLP_CV continuous variable;
GLP_IV integer variable;
GLP_BV binary variable.
...

2.2.9 glp set row bnds—set (change) row bounds
Synopsis
void glp_set_row_bnds(glp_prob *lp, int i, int type,
double lb, double ub);
Description
The routine glp_set_row_bnds sets (changes) the type and bounds of i-th
row (auxiliary variable) of the specified problem object.
The parameters type, lb, and ub specify the type, lower bound, and
upper bound, respectively, as follows:
Type Bounds Comment
GLP_FR −1 < x < +1 Free (unbounded) variable
GLP_LO lb · x < +1 Variable with lower bound
GLP_UP −1 < x · ub Variable with upper bound
GLP_DB lb · x · ub Double-bounded variable
GLP_FX lb = x = ub Fixed variable
...


Best regards

Xypron

JanaT wrote:
> Hello!
>
> I´m trying to get along with GLPK and Java and have some problems understanding
> how to use it.
>
> Defining constraints the GLPKConstants are used. Is there somewhere a list to
> explain them? Or is there a tutorial? Googling the question does´t help. The (2
> or 3) examples I found do not explain my questions...
>
> What means GLPKConstants.GLP_CV?
> GLPK.glp_set_col_kind(lp, 1, GLPKConstants.GLP_CV);
>
> What means GLPKConstants.GLP_DB?
> GLPK.glp_set_row_bnds(lp, 1, GLPKConstants.GLP_DB, 0, 0.2);
>
>
>
> Thank You,
> Jana
>
>
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