[Help-glpk] interrogating (and emptying) GLPK glp_prob instances

[Robbie Morrison]

Hello Andrew and fellow API users

I am writing some code to display the state of a GLPK
'glp_prob' instance using machine-generated HTML.  The
code is complete and I will post details and some
sample output back to this list after I resolve a
couple of small questions, namely:

Can I find out what kind of solvers ('glp_simplex',
'lpx_interior', 'lpx_intopt', 'glp_intopt') have been
run on a particular problem instance by interrogating
that instance -- or does the client code have to keep
track of the solver calls it makes?

Can I find out if the problem has changed since the
solver last ran.  I suspect not (and thereby suggest a
new status variable 'GLP_MOD' meaning "the problem has
subsequently been modified" .. or perhaps even a new
status function 'glp_get_prob_status' if you want to
retain access to the now stale solution status
information).

Finally, what is the best way to empty a problem object
of input data -- I currently remove all the rows and
cols but is there a more elegant method?  And does this
mean I can rebuild a similar problem of identical size
and have it warm start?

many thanks in advance, best wishes
---
Robbie Morrison
PhD student -- policy-oriented energy system simulation
Technical University of Berlin (TU-Berlin), Germany
University email (redirected) : address@hidden
Webmail (preferred)           : address@hidden
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