Chris,
Sage has a class name 'Mixed integer linear programming' for modeling MIPs
and class for LP Solver backends like Co-in, CPLEX, GLPK and Gurobi.
At the moment I haven't know any sage class only for vehicle routing
problem.
Raniere Gaia Costa da Silva
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Hello,
This is exactly what I was looking for, thank you. But now I also have
a second question: is it possible to add inverses for x and y? I would
also like to calculate things like 1/(x+y)^10.
Best regards,
Noud
On 15 March 2012 14:31, Simon King simon.k...@uni-jena.de wrote:
Hi Noud!
On
I am trying to understand the behaviour of the option exclude in plot() when a
range of values is included.
It looks to me that if a simple range like exclude=[pi..2*pi] is used and the
function is defined and real-valued in that range then the end points and
integer points between are
Sage has a class name 'Mixed integer linear programming' for modeling
MIPs and class for LP Solver backends like Co-in, CPLEX, GLPK and Gurobi.
At the moment I haven't know any sage class only for vehicle routing
problem.
Yep ! There's a short tutorial about its use there
:
I didn't know that SAGE could handle MILP (awesome!), I'm just playing
around with it now and was wondering if there was a way to remove a
constrain from a particular problem or indeed modify it without reseting
the whole problem.
For example:
Say I wanted to solve the problem described in the
If I wanted to change the last constraint to be w[0]-w[1]-w[2]=1 can I do
this without resetting the whole p?
Not for the moment, but this can be added with a small patch. We just need
to expose the functions from the solver's API :-)
Nathann
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On Mar 16, 6:29 am, Anthony Wickstead a.wickst...@qub.ac.uk wrote:
I am trying to understand the behaviour of the option exclude in plot() when
a range of values is included.
It looks to me that if a simple range like exclude=[pi..2*pi] is used and
the function is defined and real-valued
But in your example the first range is empty. I changed the exclude value to
[1..2,3..4] and again the first interval is fine and the second wrong.
Tony
Thanks for this bug report. Sometimes this happens even for the first range.
sage:
On Mar 16, 9:20 am, Anthony Wickstead a.wickst...@qub.ac.uk wrote:
But in your example the first range is empty. I changed the exclude value to
[1..2,3..4] and again the first interval is fine and the second wrong.
Good point, I changed everything else to avoid the pi but not that!
Hmm,
Hi,
I just started using sage and am loving it! However, I was wondering,
is there a way to use the mpi4py package in the online (sagenb.org)
notebook ?
I was hoping to do so, but am stuck due to the following two issues:
1) The documentation at Sage (http://www.sagemath.org/doc/
Jason and Dan,
Thank you for the info and suggestions. It took a while, but we got
it running.
One thing that I'm experiencing seems odd.
I created an account, logged in, made a worksheet.
When I save and quit the worksheet, I go back to my home page.
If I click sign out, nothing happens. If
You can't install MPI on the public Sage server without administrative
privileges.
Also, unless you want to learn MPI for educational purposes your are using
the wrong tool to run stuff on a single machine. For tightly coupled
problems you can't beat threads that way, and for very parallel
On Mar 16, 7:11 pm, Mike OS mosul...@math.sdsu.edu wrote:
Jason and Dan,
Thank you for the info and suggestions. It took a while, but we got
it running.
One thing that I'm experiencing seems odd.
I created an account, logged in, made a worksheet.
When I save and quit the worksheet, I
On Fri, 16 Mar 2012 at 04:11PM -0700, Mike OS wrote:
When I save and quit the worksheet, I go back to my home page.
If I click sign out, nothing happens.
Are you using Firefox? This happens with some recent versions of
Firefox. Does that same thing happen with another browser?
Dan
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Hi Nathann,
Thanks! I spent some time with the graph and milp support today, and it's
exactly what I was looking for. Do you have an idea of how the current
implementations scale with the size of the graph? Any interest in adding
support for parallel algorithms? I'm interested in the underlying
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