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problem.getQRowQMatrix

Purpose
Returns the nonzeros in a quadratic constraint coefficients matrix for the columns in a given range. To achieve maximum efficiency, problem.getQRowQMatrix returns the lower triangular part of this matrix only.
Topic areas
Problem Information, Quadratic
Synopsis
start, colind, rowqcoef = problem.getQRowQMatrix(row, first=0, last=COLS-1)
Arguments
row 
Index of the row for which the quadratic coefficients are to be returned.
first 
First column in the range.
last 
Last column in the range.
Return value
start 
Integer array containing indices indicating the starting offsets in the colind and rowqcoef arrays 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.
colind 
Integer array containing the column indices of the nonzero elements in the lower triangular part of Q.
rowqcoef 
Double array containing the nonzero element values.
Further information
1. Argument row may contain xpress.constraint objects instead of indices.
2. Arguments first, last may contain xpress.var objects instead of indices.
Related topics
problem.loadQCQP, problem.getQRowCoeff, problem.addQMatrix, problem.chgQRowCoeff, problem.getQRowQMatrixTriplets, problem.getQRows, problem.chgQObj, problem.chgMQObj, problem.getQObj.

Parent Topic Methods of the class problem

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