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Latest activity by LUYANG ZHANG
  • LUYANG ZHANG created a post,

    Question about converting a matrix to indicator matrix in gurobi


    Hi, suppose I have a matrix/vector containing decision variable x, such as v =  [x_1, 2*x_2, x_3+x_4,...], now I want to convert it into a binary matrix such as k_i = 0 if v_i = 0, k_i = 1 if v_i >...

  • LUYANG ZHANG commented,

    Hi Jaromil, thanks for replying. Here is the log info for barrier: Read MPS format model from file /project/large_scale_lp/MPS/1_day_out_SellerID1000_500.mps Reading time = 483.99 seconds : 2642357...

  • LUYANG ZHANG created a post,

    Wrong algo of dual simplex


    Hi team, I'm using GUROBI to solve a large-size MPS file which is roughly about 60G. This problem contains  26423572 rows, 265646022 columns, 962620739 nonzeros I tried with three methods, which ar...