getMatColGLPK {glpkAPI}

Retrieves Column j of the Constraint Matrix.

Description

Low level interface function to the GLPK function glp_get_mat_col. Consult the GLPK documentation for more detailed information.

Usage

  getMatColGLPK(lp, j)

Arguments

lp

An object of class "glpkPtr" as returned by initProbGLPK. This is basically a pointer to a GLPK problem object.

j

Column number j.

Details

Interface to the C function getMatCol which calls the GLPK functions glp_get_num_rows and glp_get_mat_col.

Value

Returns NULL or a list containing the non zero elements of column j:

nnz

number of non zero elements in column j

index

row indices of the non zero elements in column j

value

numerical values of the non zero elements in column j

Author(s)

Gabriel Gelius-Dietrich <[e-mail]>

Maintainer: Mayo Roettger <[e-mail]>

References

Based on the package glpk by Lopaka Lee.

The GNU GLPK home page at http://www.gnu.org/software/glpk/glpk.html.