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Description:
Discussion related to the pulp-or project
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Installation of PuLP and Solver on Mac OS X
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Hello All,
I am new to PuLP and newish to python. Please excuse any novice
questions.
I would like to install PuLP on a machine running Mac OS X 10.7.3
using python 2.6.7. This machine already has gurobi 5.0 installed to
it (which runs correctly). Ideally, I would like the PuLP
installation to be able to call both Gurobi and the CoinOR solvers.... more »
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python pulp-or: sensitivity analysis? Thanks!
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Hi Xiaoling I hope you don't mind me cross posting this to
the discussion group.
At the moment pulp does not produce sensitivity analysis. But GLPK (or I
assume CPLEX or GUROBI) does
[link]
So I would recommend using pulp to produce an .lp file then solve this... more »
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lp instead of mps
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Hello,
I have a problem with 12 variables, minimum constraints on these variables and a maximum constraint on the total.
For instance Qmin(i) = 8.333333333333334 for i = 1 to 12 and Qmax = 100 for the total.
This is of course a degenerated problem.
I use the default solver, because if Stuart think it is the best, it... more »
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Problem with CPLEX
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I have some problem about CPLEX_PY sovler. I have to know how to set
the tolerance gap for this solver. I try to set following Pulp
documentation, but I cannot do it. I set
"prob.solve(CPLEX(epgap=0.1))" in my code. Can anybody know how to set
tolerance gap? Thank you for your helping in advance and sorry for my... more »
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ILP with GLPK
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I have a big problem simplified as:
max f
s.t:
Ax<=b
x is binary
is there a way to get it into the commands easily, I'm not making my
point clear, to adjust it to your program following the examples i got
to this:
prob = LpProblem("Perrera", LpMaximize)
x = LpVariable.dicts("perros",binV ars,0,1,LpInteger)... more »
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Pulp testall error
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Hey All, I've tried to get this to work right, but I cannot seem to manage it. When I install pulp and then run pulp.pulpTestAll, this is the result I get: pulp.pulpTestAll() Solver pulp.solvers.PULP_CBC_CMD unavailable. Solver pulp.solvers.CPLEX_DLL unavailable. Solver pulp.solvers.CPLEX_CMD unavailable.... more »
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duals with glpk
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As a new user of pulp 1.5 I attempted to run a script:
The Sponge Roll Problem with Columnwise Column Generation from
[link]
but obtained the message:
duals[i] = prob.constraints[name].pi
AttributeError: 'LpConstraint' object has no attribute 'pi'... more »
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pulp and memory usage
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Hi,
I am attempting to use Python and pulp to generate very large LP
problems, with thousands upon thousands of constraints. For some of my
larger problems I have hit the memory roof of the machine I'm running
on, a 64-bit linux installation with 64 GB of RAM.
I obviously need to do some memory optimisations, but I am not sure... more »
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Pulp + SCIP?
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Hi There
Thanks for the great library- I've been using it successfully with
GLPK. Since I have a lot of mixed-integer problems and cannot afford
Gurobi, I'm interested in finding out whether there's a PULP-SCIP
connector?
If not, how difficult is it to put one together?
Thanks
Kretch
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building a 64bit version of Pulp that can do resolves
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Hi There,
I used Pulp earlier this year on a Mac, and had trouble getting a
solver working that could resolve LP models. Now it appears I'm going
to be using a Ubuntu machine. How do I install it so I have access to
a 64 bit solver capable of restarts? I believe CBC can't do
restarts. Do others? It it possible to use app-get to install such a... more »
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