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XPRSgetqrowqmatrix

Purpose
Returns the nonzeros in a quadratic constraint coefficients matrix for the columns in a given range. To achieve maximum efficiency, XPRSgetqrowqmatrix returns the lower triangular part of this matrix only.
Topic areas
Problem Information, Quadratic
Synopsis
int XPRS_CC XPRSgetqrowqmatrix(XPRSprob prob, int row, int start[], int colind[], double rowqcoef[], int maxcoefs, int * p_ncoefs, int first, int last);
Arguments
prob 
The current problem.
row 
Index of the row for which the quadratic coefficients are to be returned.
start 
Integer array which will be filled with 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. May be NULL if maxcoefs is 0.
colind 
Integer array of length maxcoefs which will be filled with the column indices of the nonzero elements in the lower triangular part of Q. May be NULL if maxcoefs is 0.
rowqcoef 
Double array of length maxcoefs which will be filled with the nonzero element values. May be NULL if maxcoefs is 0.
maxcoefs 
Number of elements to be saved in colind and rowqcoef. If maxcoefs < *p_ncoefs, only maxcoefs elements are written.
p_ncoefs 
Pointer to the integer where the number of nonzero elements in the queried columns will be returned. If the number of nonzero elements is greater than maxcoefs, then only maxcoefs elements will be returned. If p_ncoefs is smaller than maxcoefs, then only p_ncoefs will be returned. May be NULL.
first 
First column in the range.
last 
Last column in the range.
Related topics
XPRSloadqcqp, XPRSgetqrowcoeff, XPRSaddqmatrix, XPRSchgqrowcoeff, XPRSgetqrowqmatrixtriplets, XPRSgetqrows, XPRSchgqobj, XPRSchgmqobj, XPRSgetqobj.

Parent Topic Console and Library Functions

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