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XPRSgetrows, XPRSgetrows64

XPRSgetrows, XPRSgetrows64

Purpose
Returns the nonzeros in the constraint matrix for the rows in a given range.
Synopsis
int XPRS_CC XPRSgetrows(XPRSprob prob, int mstart[], int mclind[], double dmatval[], int size, int *nels, int first, int last);

int XPRS_CC XPRSgetrows64(XPRSprob prob, XPRSint64 mstart[], int mclind[], double dmatval[], XPRSint64 size, XPRSint64 *nels, int first, int last);
Arguments
prob 
The current problem.
mstart 
Integer array which will be filled with the indices indicating the starting offsets in the mrwind and dmatval arrays for each requested row. It must be of length at least last-first+2. Row 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 not required.
mrwind 
Integer arrays of length size which will be filled with the column indices of the nonzero elements for each row. May be NULL if not required.
dmatval 
Double array of length size which will be filled with the nonzero element values. May be NULL if not required.
size 
Maximum number of elements to be retrieved.
nels 
Pointer to the integer where the number of nonzero elements in the selected rows 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.
first 
First row in the range.
last 
Last row in the range.
Example
The following example returns and displays at most six nonzero matrix entries in the first two rows: 
int size=6, nels, nreturnedels, mstart[3], mrwind[6];
double dmatval[6];
...
XPRSgetrows(prob,mstart,mrwind,dmatval,size,&nels,0,1);

nreturnedels = nels > size ? size : nels;
for(i=0;i<nreturnedels;i++) printf("\t%2.1f\n",dmtval[i]);
Further information
It is possible to obtain just the number of elements in the range of columns by replacing mstart, mrwind and dmatval by NULL. In this case, size must be set to 0 to indicate that the length of arrays passed is 0.
Related topics
XPRSgetcols, XPRSgetrowrange, XPRSgetrowtype.

Parent Topic Console and Library Functions

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