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# XPRSslpgetcoefstr

Purpose
Retrieve a single matrix coefficient as a formula in a character string. For a simpler version of this function see XPRSnlpgetformulastr.
Topic areas
SLP, Problem Information
Synopsis
`int XPRS_CC XPRSslpgetcoefstr(XPRSprob prob, int row, int col, double *p_factor, char *formula, int maxbytes, int *p_nbytes);`
Arguments

prob | The current SLP problem.
row | Integer holding the row index for the coefficient.
col | Integer holding the column index for the coefficient.
p_factor | Address of a double precision variable to receive the value of the constant factor multiplying the formula in the coefficient.
formula | Character buffer in which the formula will be placed in the same format as used for input from a file. This argument may be NULL if maxbytes is zero.
maxbytes | Length of the formula buffer.
p_nbytes | Will be set to the length of the formula, not including the null terminator.

Example
The following example displays the formula for the coefficient of column 3 in row 2:

    char *buffer;
    double factor;
    int len;

    XPRSslpgetcoefstr(prob, 2, 3, &factor, NULL, 0, &len);
    buffer = malloc(len + 1);
    XPRSslpgetcoefstr(prob, 2, 3, &factor, buffer, len + 1, NULL);
    printf("\nFormula is %s", buffer);

Further information
1. If the requested coefficient is constant, then p_factor will be set to 1.0 and the value will be formatted in formula.
2. If the length of the formula would exceed maxbytes-1, the formula is truncated to the last token that will fit, and the (partial) formula is terminated with a null character.
Related topics
XPRSnlpgetformulastr, XSLPaddformulas, XPRSnlpchgformulastr, XSLPchgformula, XSLPloadformulas, XSLPgetformularows, XSLPgetformula, XSLPdelformulas
Parent Topic Library functions and the programming interface

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