getMatRowGLPK function

Retrieves Row i of the Constraint Matrix.

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

getMatRowGLPK(lp, i)

Arguments

• lp: An object of class "glpkPtr" as returned by initProbGLPK. This is basically a pointer to a GLPK problem object.
• i: Row number i.

Details

Interface to the C function getMatRow which calls the GLPK functions glp_get_num_cols and glp_get_mat_row.

Returns

Returns NULL or a list containing the non zero elements of row i: - nnz: number of non zero elements in row i

• index: column indices of the non zero elements in row i

• value: numerical values of the non zero elements in row i

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