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# XPRSgetrows, XPRSgetrows64

Purpose
Returns the nonzeros in the constraint matrix for the rows in a given range.
Topic area
Problem Information
Synopsis
`int XPRS_CC XPRSgetrows(XPRSprob prob, int start[], int colind[], double colcoef[], int maxcoefs, int *p_ncoefs, int first, int last);`
``
`int XPRS_CC XPRSgetrows64(XPRSprob prob, XPRSint64 start[], int colind[], double colcoef[], XPRSint64 maxcoefs, XPRSint64 *p_ncoefs, int first, int last);`
Arguments

prob | The current problem.
start | Integer array which will be filled with the indices indicating the starting offsets in the colind and colcoef arrays for each requested row. It must be of length last-first+2. Row i starts at position start[i] in the colind and colcoef arrays, and has start[i+1]-start[i] elements in it. May be NULL if not required.
colind | Integer array of length maxcoefs which will be filled with the column indices of the nonzero elements for each row. May be NULL if not required.
colcoef | Double array of length maxcoefs which will be filled with the nonzero element values. May be NULL if not required.
maxcoefs | Maximum number of elements to be retrieved.
p_ncoefs | 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 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 if not required.
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 maxcoefs=6, ncoefs, nreturnedels, start[3], colind[6];
    double colcoef[6];
    ...
    XPRSgetrows(prob,start,colind,colcoef,maxcoefs,&ncoefs,0,1);

    nreturnedels = ncoefs > maxcoefs ? maxcoefs : ncoefs;
    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 start, colind and colcoef by NULL. In this case, maxcoefs must be set to 0 to indicate that the length of arrays passed is 0.
Related topics
XPRSgetcols, XPRSgetrowtype.
Parent Topic Console and Library Functions

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