getMatColGLPK function

Retrieves Column j of the Constraint Matrix.

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

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.

Returns

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

References

Based on the package glpk by Lopaka Lee.

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

Author(s)

Gabriel Gelius-Dietrich geliudie@uni-duesseldorf.de

Maintainer: Mayo Roettger mayo.roettger@hhu.de