How do I change a batch of control parameters?

Are you working with Mosel or with one of the library APIs?

I figure it out.  I just needed the  integer values of the parameters which I got from the header file.

With the C API you could also use this routine:

   int XPRS_CC XPRSsetparam(XPRSprob prob,const char* _paramname, const char* _svalue);

that allows you to set Optimizer controls by string, meaning that you do not have to first check whether the control is an integer or double, such as in:

  XPRSsetparam(myprob, "XPRS_PRESOLVE", "1");

Thanks. I will try that.  My workaround was to read in the integer value for the name of the parameter. I appreciate your help:)