On Friday, January 20, 2017 at 12:31:40 PM UTC, [email protected] wrote: > > Thanks, I'm going to install the newest version of Sage. and `dsdp` is > supported also by default in the cvxopt of sage? >
no, dsdp is not supported by default. Do you need to solve semidefinite optimisation problems (SDP)? What are the optimisation problems you are solving? Sage does have a much better (mixed integer) linear programming interface http://doc.sagemath.org/html/en/thematic_tutorials/linear_programming.html#linear-programming http://doc.sagemath.org/html/en/reference/numerical/sage/numerical/mip.html than the one via cvxopt; it has many backends available, including backends to commercial solvers such as CPLEX etc. It also has a similar interface for SDP, see http://doc.sagemath.org/html/en/reference/numerical/sage/numerical/sdp.html (although the only backend available ATM is cvxopt) > > On Friday, January 20, 2017 at 1:26:16 PM UTC+1, Dima Pasechnik wrote: >> >> 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.
