Checking the data

Xpress NonLinear includes the function XSLPwriteprob which writes out a non-linear problem in text form which can then be checked manually. Indeed, the problem can then be run using the XSLP console program, provided there are no user functions which refer back into your compiled program. In particular, this facility does allow small versions of a problem to be checked before moving on to the full size ones.

The first argument is the Xpress NonLinear problem pointer; the second is the name of the matrix to be produced (the suffix ".mat" will be added automatically). The last argument allows various different types of output including "scrambled" names – that is, internally-generated names will be used rather than those you have provided. For checking purposes, this is obviously not a good idea.