XPRSgetqrowqmatrix
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.
Synopsis
int XPRS_CC XPRSgetqrowqmatrix(XPRSprob prob, int irow, int mstart[], int mclind[], double dqe[], int size, int * nels, int first, int last);
Arguments
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prob
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The current problem.
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irow
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Index of the row for which the quadratic coefficients are to be returned.
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mstart
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Integer array which will be filled with indices indicating the starting offsets in the
mclind and
dobjval arrays for each requested column. It must be length of at least
last-first+2. Column
i starts at position
mstart[i] in the
mrwind and
dmatval arrays, and has
mstart[i+1]-mstart[i] elements in it. May be NULL if size is 0.
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mclind
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Integer array of length size which will be filled with the column indices of the nonzero elements in the lower triangular part of Q. May be NULL if size is 0.
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dqe
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Double array of length size which will be filled with the nonzero element values. May be NULL if size is 0.
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size
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Number of elements to be saved in mclind and dqe. If
size < *nels, only
size elements are written.
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nels
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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 size, then only size elements will be returned. If
nels is smaller than size, then only
nels will be returned.
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first
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First column in the range.
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last
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Last column in the range.
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Related topics
XPRSloadqcqp,
XPRSgetqrowcoeff,
XPRSaddqmatrix,
XPRSchgqrowcoeff,
XPRSgetqrowqmatrixtriplets,
XPRSgetqrows,
XPRSchgqobj,
XPRSchgmqobj,
XPRSgetqobj.