glpk

问题 I am new in ampl and I want to use if condition in ampl with the following information: I have a binary variable X[p,r], where {p in P, r in R}. Now I want to make a new constraint such that the variable R[p,r] is used where X[p,r]=0. I do not know how I can write it or even if the ampl can handle it or not, I tried the following constraint but they did not work: s.t. a1{r in R, p in P and X[p,r]=0}: s.t. a2{r in R p in P and X[p,r]=0}; s.t. a2{r in R ,p in P, and X[p,r]=0}; s.t. a2{r in R, p

问题 I am trying to install sparkTable in R 3.1.0 which depends on Rglpk . I manually installed GPLK on the system and added the libs folder to LD_LIBRARY_PATH before going into R for the install.packages("sparkTable") procedure. I get this error during the installation process. Any ideas? * installing *source* package ‘Rglpk’ ... ** package ‘Rglpk’ successfully unpacked and MD5 sums checked ** libs /bin/sh: line 0: cd: GLPK: No such file or directory make: *** [GLPK.ts] Error 1 ERROR: compilation

问题 Are there any Mixed Integer Linear Programming(MILP) solver for Python? Can GLPK python solve MILP problem? I read that it can solve Mixed integer problem. I am very new to linear programming problem. So i am rather confused and cant really differentiate if Mixed Integer Programming is different from Mixed Integer Linear programming(MILP). 回答1: Pulp is a python modeling interface that hooks up to solvers like CBC(open source), CPLEX (commercial), Gurobi(commercial), XPRESS-MP(commercial) and