This might be a quite basic question, however, I did not find any suggestions so far.
I am running the Scip Opt Suite on OSX and everything runs well so far. No I wanted to start to model my first mathematical problem in zimpl, however I do not know how to start.
However, in the user's guide there is just prescribed how to load existing zpl-files, but not how to create on files.
Do you have any suggestions or any further threads dealing with that task?
Kind Regards
In the zimpl package root, there's an example directory. The .zpl files in example are a great starting point for writing your own zimpl inputs. Also, zimpl's author wrote this pdf that walks through the process of writing a formulation to solve a Sudoku puzzle using zimpl.
Related
I would like to write a presolved problem into a file. Is there any way to do it?
write problem does not do it for me, it gives me the original problem that I read with SCIP.
The context is that I am working on SAT problems. The presolving phase of SCIP reduces the number of constraints and variables of the problem, effectively making the problem a little smaller. I would like to take a look at the presolved problem and compare it with the original problem and make some observations.
Yes, it is very easy, just use write transproblem.
The SCIP interactive shell also tells you all the possible commands that you can use, e.g. if you just type write in the SCIP shell, you see all available write commands
I want to find my mistake in GAMS model. I don't have any errors , but my model doesn't work well
Is there any debugging tools in GAMS ?( like debugger tools in other software, e.g MATLAB)
Best
Unfortunately, I have not come across any.
If you have no errors in GAMS, it rather points to a modelling problem rather than a GAMS one. GAMS is like any other programming/modelling software, what you put in is what you get out. However, there are some commands and some intuitive ways you can find out the problem with your model:
One common way is by using the display and $stop commands. If you have loops within your GAMS code, it is best to track the progress of the loop by displaying some key variables either to your .lst file or using put utility (also a nice tool). I use the put utility, and write the code to display key variables at each point of my code to identify where things may have gone wrong.
The $stop command terminates your GAMS code at the line in which it is written.
Hope this helps.
I plan to make an evolutionary program to make redcode warriors for CoreWars. However, I have absolutely no idea how to run the code generated without having to manually open the program and put in the Warriors. Since I hope to have the evolutionary program run through several warriors per minute at least, I'd rather not have to play the role of administrator that much. I'm using the ARES simulator, but as for my research on running warriors through it with a script, I haven't found anything.
I'm really just looking for something like:
SomeSimulator.exe --warrior1 megalordthedestroyer.red --warrior2 tinathebabybunny.red
So I found a python module that supports both parsing redcode and running pmars simulations. With a little bit of patching I'm able to hook this up to my evolutionary factory and automate it all.
The link: https://github.com/rodrigosetti/corewar
I have a problem with several references in my VB.NET project.
For example I have this line of code:
Dim m As New Chilkat.Email
It comes from the library "ChilkatDotNet45.dll".
When I click on "References" and locate this dll, I can see that it has the settings "Use local copy" and "Do not include interop types".
When I switch to Release mode, the compiler tells me that "Chilkat.EMail" is not defined.
I have this problem with several DLLs, so it is not specific to Chilkat.
Can somebody tell me what I did wrong?
Thank you.
One of the standard approaches to solving any programming-related issue is trying to reduce the scope of the investigation. If you have a big project, in which something doesn't work, try to create a smaller project, and try to replicate desired functionality in it. Reduce as much as possible, down to a brand new project with maybe 5-10 lines of code in it.
If you were unable to solve your problem after making a reduced test case, now it's good time to post it on StackOverflow. I am usually reducing problems while writing a question on SO (not before, as one might think), constantly thinking "ok, is it minimized enough"; and this is how 90% of the questions never get posted - I often find a solution along the way of reducing my question to bare bones. :)
In your case, can you build a simplified project which has this problem and post a link here? We could then try switching Debug to Release on our machines and see if the we can reproduce. There are too many options to do the guesswork.
Recently (about a month ago) I was trying to introduce new constructs to my company's in-house extension language, and struggling with a couple of reduce-reduce errors. While I eventually solved this problem, digging into the y.output file was no picnic.
As an experiment, I tried using Bison's --graph=<file> option to output a DOT file (note that our standard build uses Byacc, not Bison). As I'm on a 'turnkey' Linux box, I didn't have a Graphviz installation and could not easily install from RPMs (working on Red Hat Enterprise Linux 4). Instead, I built it from source.
As an initial experiment, I tried to run dotty with an output of Postscript. Now our internal language is your average home-grown, Turing-complete, dynamically typed scripting language, but I was unprepared for what followed. The dotty run took over four hours (2GHz dual core AMD64 box)! And when it was done, the graph that was rendered was not what I would call readable.
So, quite simply, I'm looking for advice. Are there a set of switches which would improve the outcome over the 'default' approach I took? I'm looking for experience in
optimizing 'render' time
improving readability of the graph
possible advice on better graphical viewers
I imagine you've already seen this link, but just for completeness, there is a list of viewers etc. at: http://graphviz.org/resources/ or see https://web.archive.org/web/20131005020548/http://graphviz.org/Resources.php for an archived copy.