Retrieving and Changing Control Values

Console Xpress users may obtain control values by issuing the control name at the Optimizer prompt, >, and hitting the RETURN key. Controls may be set using the assignment syntax:

control_name = new_value

where new_value is an integer value, double or string as appropriate. For character strings, the name must be enclosed in single quotes and all eight characters must be given.

Users of the FICO Xpress Libraries are provided with the following set of functions for setting and obtaining control values:

It is an important point that the controls as listed in this chapter must be prefixed with XPRS_ to be used with the FICO Xpress Libraries and failure to do so will result in an error. An example of their usage is as follows:

XPRSgetintcontrol(prob, XPRS_PRESOLVE, &presolve);
printf("The value of PRESOLVE is %d\n", presolve);
XPRSsetintcontrol(prob, XPRS_PRESOLVE, 1-presolve);
printf("The value of PRESOLVE is now %d\n", 1-presolve);