Initializing help system before first use

problem.addqmatrix

Purpose
Adds a new quadratic matrix into a row defined by triplets.
Synopsis
problem.addqmatrix(row, rowqcol1, rowqcol2, rowqcoef)
Arguments
row 
Row (i.e. xpress.constraint object, index, or name) where the quadratic matrix is to be added.
rowqcol1 
Array with first variables (i.e. xpress.varobjects, indices, or names) in the triplets.
rowqcol2 
Array with second variables (i.e. xpress.varobjects, indices, or names) index in the triplets.
rowqcoef 
Array of coefficients in the triplets.
Further information
1. The triplets should define the upper triangular part of the quadratic expression. This means that to add x2 + 4 xy the rowqcoef array shall contain the coefficients 1 and 2.
2. The matrix defined by rowqcol1, rowqcol2 and rowqcoef should be positive semi-definite for ≤ and negative semi-definite for ≥ rows.
3. The row must not be an equality or a ranged row.
Related topics
problem.loadproblem, problem.getqrowcoeff, problem.chgqrowcoeff, problem.getqrowqmatrix, problem.getqrowqmatrixtriplets, problem.getqrows, problem.chgqobj, problem.chgmqobj, problem.getqobj.

Parent Topic Xpress problem methods

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