How can I undo the declaration of variables, respectively,
constraints, if they becom superfluous? I don't want to override them,
I want to delete them and free related memory! Anyone an idea?

Thanks a lot!!!

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This thread replaces the undermentioned:

"Hi! My optimization model is extended stepwise, that is, it is set-up
and solved for a specific planning horizon and extended afterwards to
cover more periods. This is done to simulate a rolling horizon
environment. Therefore, in each simultion run the optimization model
is extended with new constraints and variables. Only in under special
circumstance some already inialized constraints in variable are
superfluous. I would like to delete these not needed constraints and
variables, because for large simulation instances the model exceeds
the available RAM of my computer and Xpress terminates. There are a
lot of not needed constraints, because preprocessing always reduces
the problem size strongly.

How do I delete constraints and variables? Does a corresponding
function to "create" exist? Or could I use "sethidden"? I could image
that the latter doesn't help to reduce memory usage...

 Thanks a lot!"