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# XPRSaddcbnlpcoefevalerror

Purpose
Add a user callback to be called when an evaluation of a coefficient fails during the solve
Topic areas
Callback, Numerics
Synopsis
`int XPRS_CC XPRSaddcbnlpcoefevalerror(XPRSprob prob, int (XPRS_CC *nlpcoefevalerror) (XPRSprob cbprob, void *cbdata, int row, int col), void *data, int priority);`
Arguments

prob | The current problem.
nlpcoefevalerror | The function to be called when an evaluation fails.
cbprob | The problem passed to the callback function.
cbdata | The user-defined object passed as data to XPRSaddcbnlpcoefevalerror.
row | The row position of the coefficient.
col | The column position of the coefficient.
data | Address of a user-defined object, which can be used for any purpose by the function. data is passed to nlpcoefevalerror as cbdata.
priority | An integer that determines the order in which callbacks of this type will be invoked. The callback added with a higher priority will be called before a callback with a lower priority. Set to 0 if not required.

Further information
This callback can be used to capture when an evaluation of a coefficient fails. The callback is called only once for each coefficient.
Related topics
XPRSnlpprintevalinfo XPRSremovecbnlpcoefevalerror
Parent Topic Library functions and the programming interface

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