Xpress-MP Google Group

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Infeasible Constraint

2008-10-01T16:34:44Z

I have my model almost completely debugged except for one last error -
infeasible constraint. I know that technically, it is not infeasible
as I have been able to run the same model with other software (LINGO)
with no problem. I know the typical checks for this, but is there a
way to see the values going into the constraint so that I can see

Using double or triple sums in the objective function.

2008-09-29T15:40:03Z

I am new to using Xpress-MP and need some help. I cannot find any
examples in the documentation or in the program itself of how to code
(in Mosel) double sums (or higher). I thought it would be like:

sum(i in SET1) (sum(j in SET2) cost(i,j))

But I keep getting syntax errors. My actual function is much more

abs function at objective function

2008-09-26T07:42:08Z

How to make the following term in Mosel language?

Maximize |x - y|

I tried

Maximize abs(x-y)

but, it didn't work.

plz help me.
Thanks.

Optimality Gap

2008-09-19T05:17:13Z

Hi All~

I have a question when I am solving a large model.
When we use XPRS_MAXTIME to stop the optimizer after running certain
amount of time, is there a way to return the optimality gap between
current solution and the true optimal solution? Thanks a lot for the
help.

Peng

Is Student version available for Linux operating system?

2008-09-12T06:27:35Z

Dear All,

I am a PhD student at IIT Bombay. I am working on optimization and I
use Linux operating system.
please tell me that Xpress-MP Student version is available for Linux
operating system or not ?

Thank you
-Sekhar

Re: Help needed urgently!

2008-09-30T16:27:34Z

What error message are you getting?

Using the mod function

2008-08-19T15:24:49Z

Hi All,

I was curious if the mod function could be used on variables. I've
tried and my IP doesn't seem to compile. It keeps throwing the error:
"E-112 Numeric expression expected for operator `mod' ". Does anyone
know for certain if it's because I'm using a variable? Thanks for the
help!

parameter initialization in C#

2008-08-07T00:02:33Z

Hi,
I'm trying to pass some input parameters into Mosel from C# but 'm
running into some trouble. I'm using the mmexdrvs.cs as an example and
I can initialize a first set of variables but I'm having trouble
initializing a second group of them.

I have in a Mosel file:

parameters
INIT_FNAME='in.txt'

Warning W-0

2008-07-31T16:25:31Z

Hello,

I install the current version of Xpress-MP for students, and I get
this message when the program starts:

"(Line: 0, Col: 0) : warning 0:XPRS (Warning): Wrong XPRS version
number 0 (expected: 19)"

Then it shows : "XPRS: Error when loading the problem." when I run any
model.

I have installed this student version in 2 PCs, and I get the same

make a dll in mosel

2008-07-21T15:53:50Z

Hi! I need some help please. I need to create a dll from mosel. I
don't know how to do it or even if it's possible. Thanks

Running time error

2008-07-05T08:52:42Z

Hi every one,
I am running a problem for my project using Xpress-MP. Every time I
run it for about one hour, the program indicates this kind of error:
An unexpected exception occurred in Model/Optimizer.It is UNSAFE to
continue. please save your work and restart.
I have read someone's post in this group advising to review some

How customize the branch and bound algorithm?

2008-06-19T09:12:09Z

Sorry,
i need to introduce a heuristic procedure for each node of the branch
and bound tree. The problem is that in my procedure i need to make an
optimization with minimize(XPRS_LIN,""), but it's impossible if the
optimizer already running. How can i do? I read about EMOSL, but i
didn't find it.

errors running models

2008-06-18T12:41:16Z

I'm using Model 2.2.0, mmxprs version 1.6.2, mmive version 1.18.5
I'm finding that programs that used to run under previous versions now
don't. I've changed arrays to :, when initialised from file. Some of
the arrays are initialised successfully, but there is an "error runing
model or execution interrupted" and no other indication of what is

.NET wrapper throws an BadImageFormatException

2008-06-16T18:32:17Z

Hi,

I tried to use the xprsdn.dll library in a visual studio 2005 project,
but every time i try to call a function (i.e. Init(string) or Init())
in the optimization namespace, I get a System.BadImageFormatException .
What am I doing wrong?
My System is a Vista x64 Business, could this be a problem?