[Cbc] Pass model and/or data to the executable via standard input

[Pietro Scionti]

John,
"import" was exactly the command I was toying around, but no variation of it seems to work.

I find "type" to be the windows equivalent of "cat", so I can list file contents on the standard output, and the pipe "|" seems to work identically on windows ("Reads the output from one command and writes it to the input of another command").
Indeed "type model.mod | glpsol -m /dev/stdin" works for GLPK; obviously this is not how I would use it since the whole point is to avoid the phsysical file, but what you write (ie the part from the pipe onwards :) ) replicates my need exactly.

You say you committed such a fix in the trunk; does this mean I only have to wait till the next release, then I can call my System.Diagnostics.Process with "cbc import stdin_lp solve solution output.out" and my lp model as an input stream?



Ted,
If i try to call "type model.lp | cbc -import -", this is the output i get:

command line - cbc -import - (default strategy 1)
Current default (if $ as parameter) for import is
Switching to line mode
Coin:No match for \* - ? for list of commands
No match for Problem: - ? for list of commands
No match for model - ? for list of commands
No match for *\ - ? for list of commands
Coin:Coin:Coin:No match for a: - ? for list of commands
No match for + - ? for list of commands
No match for x - ? for list of commands
Coin:Coin:No match for Subject - ? for list of commands
No match for To - ? for list of commands
Coin:No match for c: - ? for list of commands
No match for + - ? for list of commands
No match for x - ? for list of commands
No match for > - ? for list of commands
No match for -0 - ? for list of commands
Coin:Coin:No match for Bounds - ? for list of commands
Coin:No match for x - ? for list of commands
No match for free - ? for list of commands
Coin:Coin:Total time (CPU seconds):       0.07   (Wallclock seconds):       0.07

so it is trying to match every word in the file (!) to a cbc command.

If I try to call "type model.lp | cbc -import stdin", it says "Unable to open file .\stdin", so it's treating it a regular filename.

As for building GMPL into CBC, you correctly pointed out the licensing issues I want to avoid, but if/when you're able to replicate it under current compilers, it would be great, at least for future reference.


Thank you all very much,
Pietro



>Pietro,
>
>If you can do something like this (in linux) would that work?
>
>cat test.lp |bin/cbc -import stdin_lp -solve
>Welcome to the CBC MILP Solver
>
>command line - bin/cbc -import stdin_lp -solve (default strategy 1)
>Continuous objective value is 3.23684 - 0.00 seconds
>Cgl0004I processed model has 1 rows, 3 columns (0 integer) and 3 elements
>Cbc3007W No integer variables - nothing to do
>
>I have committed fixes to trunk - key thing is to import from stdin_lp
>(exact spelling needed)
>
>Does anyone know how to get GMPL working on Windows?
>
>John Forrest


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