lukpank / go-glpk Goto Github PK

When I read in the LP below with the ReadLP method, I get as result x_1 = 2, x_2 = 0, x_3 = 2, x_4 = 0 which is clearly wrong when looking at the LP.

\* Problem: Unknown *\

Maximize
obj: 0 x_1

Subject To
r_1: + x_2 + x_1 = 2
r_2: - x_2 = 0
r_3: + x_4 + x_3 = 2
r_4: - x_3 = 0
r_5: + x_3 + x_1 <= 10
r_6: + x_4 + x_2 <= 8

End

When I don't read in the LP but create a Prob datastructure it seems to work.

I have succeeded in installing and building your go-glpk package, linking to libglpk.a
This static library is recompiled afresh using gcc and recent glpk version 4-64, and the check was successful: "OPTIMAL LP SOLUTION FOUND" on examples\plan.mps and examples\murtagh.mps and

Unfortunately, the (very thorough) test_glpk didn't succeed:

$ go test
glp_free: ptr = 0000000000982D10; invalid pointer
Error detected in file ..\src\env\alloc.c at line 59
exit status 3
FAIL github.com/lukpank/go-glpk/glpk 13.750s

I probably have to ask glpk specialists...

If I try a normal go build . or go test ./... command I get the error below:

fatal error: glpk.h: No such file or directory #include <glpk.h> #2

I have glpk installed on my machine:

$ glpk
GLPSOL--GLPK LP/MIP Solver 5.0
No input problem file specified; try glpk --help

In addition to that I tried downloading the source code of the library and overriding the path to the glpk.h file but I get a different error:

$ CGO_ENABLED=1 CGO_CFLAGS="-I/path/to/glpk-5.0/src/" go build .
/usr/local/go/pkg/tool/darwin_arm64/link: running clang failed: exit status 1
ld: library not found for -lglpk
clang: error: linker command failed with exit code 1 (use -v to see invocation)

I have no idea how to proceed. Has anyone had success with using this library on M1 Mac?

Hi,
I'm running go-glpk but it generates a lot of noise to the stdout when solving. Is there a way to disable this?
Thanks

Can't figure out a solution.