XPRSchgmcoef, XPRSchgmcoef64
XPRSchgmcoef, XPRSchgmcoef64 |
Purpose
Used to change multiple coefficients in the
matrix. If any coefficient does not already exist, it will be added to the matrix. If many coefficients are being added to a row of the matrix, it may be more efficient to delete the old row of the matrix and add a new one.
Synopsis
int XPRS_CC XPRSchgmcoef(XPRSprob prob, int nels, const int mrow[], const int mcol[], const double dval[]);
int XPRS_CC XPRSchgmcoef64(XPRSprob prob, XPRSint64 nels, const int mrow[], const int mcol[], const double dval[]);
Arguments
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prob
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The current problem.
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nels
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Number of new coefficients.
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mrow
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Integer array of length
nels containing the row indices of the coefficients to be changed.
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mcol
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Integer array of length
nels containing the column indices of the coefficients to be changed.
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dval
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Double array of length
nels containing the new coefficient values. If an element of
dval is zero, the coefficient will be deleted.
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Related controls
Double
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Tolerance on matrix elements.
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Example
mrow[0] = 0; mrow[1] = 3; mcol[0] = 1; mcol[1] = 5; dval[0] = 2.0; dval[1] = 0.0; XPRSchgmcoef(prob,2,mrow,mcol,dval);
This changes two elements to values
2.0 and
0.0.
Further information
XPRSchgmcoef is more efficient than repeated calls to
XPRSchgcoef and should be used in its place if many coefficients are to be changed.
Related topics