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glpkAPI (version 1.2.1)

getMatColGLPK: 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.

Value

  • Returns NULL or a list containing the non zero elements of column j:
  • nnznumber of non zero elements in column j
  • indexrow indices of the non zero elements in column j
  • valuenumerical values of the non zero elements in column j

Details

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

References

Based on the package glpk by Lopaka Lee. The GNU GLPK home page at http://www.gnu.org/software/glpk/glpk.html.