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The routine CPXcheckvals checks an array of indices and a
 corresponding array of values for input errors. The routine is useful for
 validating the arguments of problem modification routines such as
 CPXchgcoeflist, CPXchgbds,
 CPXchgobj, and CPXchgrhs. This data checking
 routine is found in source format in the file check.c which is
 provided with the standard CPLEX distribution. To call this routine, you
 must compile and link check.c with your program as well as the
 CPLEX Callable Library.
Example
Consider the following call to CPXchgobj:
status = CPXchgobj (env, lp, cnt, indices, values);
The parameters to this routine could be checked with a call to
 CPXcheckvals like this:
status = CPXcheckvals (env, lp, cnt, NULL, indices, values);
| env | A pointer to the CPLEX environment as returned by   | 
| lp | A pointer to a CPLEX problem object as returned by   | 
| cnt | The length of the indices and values arrays to be examined.  | 
| rowind | An array containing row indices. May be NULL.  | 
| colind | An array containing column indices. May be NULL.  | 
| values | An array of values. May be NULL.  |