Initializing help system before first use

problem.getqrowqmatrix

Purpose
Returns the nonzeros in a quadratic constraint coefficients matrix for the columns in a given range. To achieve maximum efficiency, getqrowqmatrix returns the lower triangular part of this matrix only.
Synopsis
problem.getqrowqmatrix(row, start, colind, rowqcoef, maxcoefs, first, last)
Arguments
row 
Row (i.e. xpress.constraint object, index, or name) for which the quadratic coefficients are to be returned.
start 
List to be filled with indices indicating the starting offsets in the colind and dobjval lists for each requested column. It must be length of at least last-first+2. Column i starts at position start[i] in the colind and rowqcoef arrays, and has start[i+1]-start[i] elements in it. May be None if maxcoefs is 0.
colind 
Array of length maxcoefs which will be filled with the columns of the nonzero elements in the lower triangular part of Q. May be None if maxcoefs is 0.
rowqcoef 
Array of length maxcoefs which will be filled with the nonzero element values. May be None if maxcoefs is 0.
maxcoefs 
Maximum number of elements to be returned in colind and rowqcoef.
first 
First column in the range.
last 
Last column in the range.
Related topics
problem.loadproblem, problem.getqrowcoeff, problem.addqmatrix, problem.chgqrowcoeff, problem.getqrowqmatrixtriplets, problem.getqrows, problem.chgqobj, problem.chgmqobj, problem.getqobj.

Parent Topic Xpress problem methods

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