There is something broken in your sage installation; for me the following works:
c=vector(RDF,[-4,-5]) G=matrix(RDF,[[2,1],[1,2],[-1,0],[0,-1]]) h=vector(RDF,[3,3,0,0]) sol=linear_program(c,G,h,solver='glpk') sol['x'] ouput is GLPK Simplex Optimizer, v4.60 4 rows, 2 columns, 6 non-zeros * 0: obj = 0.000000000e+00 inf = 0.000e+00 (2) * 2: obj = -9.000000000e+00 inf = 0.000e+00 (0) OPTIMAL LP SOLUTION FOUND (1.0, 1.0) In fact, BUILD_GLPK is set to 1 in the patch applied to cvxopt's setup.py at the time sage's cvxopt package is built, see build/pkgs/cvxopt/patches/setup.py.patch We will add a test in the docs, cf. https://trac.sagemath.org/ticket/22217 that I just opened. On Friday, January 20, 2017 at 12:11:37 PM UTC, Dima Pasechnik wrote: > > > > On Friday, January 20, 2017 at 11:44:46 AM UTC, [email protected] wrote: >> >> When I run a program it tells me that >> `ValueError: invalid option (solver = 'glpk'): cvxopt.glpk is not >> installed`. >> >> Then I try to install cvxopt with glpk from source. That is, change >> BUILD_GLPK to 1 in the setup.py and then `python setup.py install` in the >> sage shell. But it gives me error that >> `error: command 'gcc' failed with exit status 1`. >> > > This actually should be fixed properly, in the sense that both glpk and > cvxopt are standard Sage packages, and so nothing should prevent > BUILD_GLPK=1 in cvxopt settings. > > In fact, I am under impression that it was working in the past, see (very > old) > https://trac.sagemath.org/ticket/9598 and > https://trac.sagemath.org/ticket/6456 > > > -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
