I create a problem, then optimize it, and save status for variables and
constraints, and delete the problem.
I create a new problem, early the same as the first one : I only remove
some variables (and so modify/remove some constraints).
Is there a way, in this configuration, to use the statuses of the first
optimization ? The number of basis variable in the first optimization is
not the same as the number of rows in the second, but the basis of the
first optimization could be usefull for the second.
If the number of basic variables is not equal to the number of rows,
the basis is invalid and therefore cannot be used as initial basis
(at least glpk does not provide such a feature).
Rather than removing basic variables, that invalidates the basis, you
could fix them at zero; this gives the same effect, however, keeps the
basis valid.