| Overview | Group | Index | Concepts | 
The routine CPXmstwrite is used to write a MIP start
 to an .mst file.
| env | A pointer to the CPLEX environment as returned by   | 
| lp | A pointer to the CPLEX problem object as returned by   | 
| filename_str | A character string containing the name of the file to which the MIP start information should be written.  |