Write model files failed

[syan-cn]

I want to save .lp file of my model, but I can't find a successful way. I tried the follwing methods for the cpmp example in the official document.

.wirteLP()

m.writeLP()

and

m.writeLP('model.lp')

These two methods creat files named LP.lp or model.lp automatically. But in the file, the name of variables aren't the assigned name in the code and the constraints aren't completed or maybe wrong.

Minimize
  obj: 1.6000000000000000e+01 x2 + 1.4000000000000000e+01 x3 + 1.9000000000000000e+01 x4 + 4.0000000000000000e+00 x5 + 2.3000000000000000e+01 x8
	 + 1.8000000000000000e+01 x9 + 4.0000000000000000e+00 x10 + 1.6000000000000000e+01 x11 + 7.0000000000000000e+00 x12 + 1.9000000000000000e+01 x13
	 + 7.0000000000000000e+00 x14 + 2.1000000000000000e+01 x15 + 6.0000000000000000e+00 x16 + 1.5000000000000000e+01 x17 + 1.4000000000000000e+01 x20
	 + 1.0000000000000000e+01 x21 + 1.0000000000000000e+01 x22 + 2.5000000000000000e+01 x23 + 2.2000000000000000e+01 x24 + 2.0000000000000000e+00 x25
	 + 2.4000000000000000e+01 x27 + 1.0000000000000000e+01 x29 + 2.0000000000000000e+00 x30 + 2.2000000000000000e+01 x31 + 2.5000000000000000e+01 x32
	 + 2.5000000000000000e+01 x33 + 2.1000000000000000e+01 x34 + 1.5000000000000000e+01 x35 + 1.5000000000000000e+01 x36 + 3.4000000000000000e+01 x37
	 + 1.5000000000000000e+01 x38 + 2.5000000000000000e+01 x39 + 2.7000000000000000e+01 x41 + 2.5000000000000000e+01 x42 + 2.5000000000000000e+01 x43
	 + 1.8000000000000000e+01 x44 + 2.7000000000000000e+01 x45 + 1.6000000000000000e+01 x47 + 1.3000000000000000e+01 x49 + 4.0000000000000000e+00 x50
	 + 1.7000000000000000e+01 x51 + 2.8000000000000000e+01 x53 + 2.2000000000000000e+01 x54 + 2.2000000000000000e+01 x56 + 1.5000000000000000e+01 x57
	 + 1.0000000000000000e+00 x58 + 2.3000000000000000e+01 x59 + 2.9000000000000000e+01 x60 + 1.1000000000000000e+01 x61 + 7.0000000000000000e+00 x62
	 + 3.0000000000000000e+01 x63 + 1.2000000000000000e+01 x64 + 3.6000000000000000e+01 x65 + 1.3000000000000000e+01 x66 + 6.0000000000000000e+00 x68
	 + 3.8000000000000000e+01 x69 + 7.0000000000000000e+00 x71 + 2.1000000000000000e+01 x72 + 1.6000000000000000e+01 x73 + 3.3000000000000000e+01 x74
	 + 2.9000000000000000e+01 x75 + 1.5000000000000000e+01 x76 + 2.1000000000000000e+01 x77 + 1.8000000000000000e+01 x78 + 2.7000000000000000e+01 x79
	 + 7.0000000000000000e+00 x81 + 3.0000000000000000e+01 x82 + 2.1000000000000000e+01 x83 + 1.3000000000000000e+01 x84 + 1.7000000000000000e+01 x86
	 + 3.3000000000000000e+01 x87 + 2.8000000000000000e+01 x88 + 1.2000000000000000e+01 x89 + 1.1000000000000000e+01 x90 + 1.4000000000000000e+01 x92
	 + 1.5000000000000000e+01 x93 + 7.0000000000000000e+00 x94 + 1.4000000000000000e+01 x96 + 1.9000000000000000e+01 x97 + 2.6000000000000000e+01 x98
	 + 2.3000000000000000e+01 x99 + 2.1000000000000000e+01 x100 + 1.7000000000000000e+01 x101 + 2.5000000000000000e+01 x102 + 1.9000000000000000e+01 x103
	 + 2.1000000000000000e+01 x106 + 8.0000000000000000e+00 x107 + 2.0000000000000000e+01 x108 + 4.4000000000000000e+01 x109 + 1.3000000000000000e+01 x110
	 + 3.5000000000000000e+01 x111 + 2.7000000000000000e+01 x113 + 2.3000000000000000e+01 x114 + 1.0000000000000000e+00 x115 + 2.1000000000000000e+01 x116
	 + 1.4000000000000000e+01 x117 + 2.3000000000000000e+01 x119 + 3.0000000000000000e+01 x120 + 1.2000000000000000e+01 x121 + 8.0000000000000000e+00 x122
	 + 3.0000000000000000e+01 x123 + 1.2000000000000000e+01 x124 + 3.6000000000000000e+01 x125 + 1.3000000000000000e+01 x126 + 8.0000000000000000e+00 x128
	 + 2.4000000000000000e+01 x129 + 6.0000000000000000e+00 x130 + 2.6000000000000000e+01 x131 + 2.4000000000000000e+01 x132 + 8.0000000000000000e+00 x133
	 + 8.0000000000000000e+00 x134 + 1.5000000000000000e+01 x135 + 1.4000000000000000e+01 x137 + 1.0000000000000000e+01 x138 + 1.2000000000000000e+01 x140
	 + 1.3000000000000000e+01 x141 + 3.4000000000000000e+01 x142 + 1.8000000000000000e+01 x143 + 1.2000000000000000e+01 x144 + 1.7000000000000000e+01 x145
	 + 1.3000000000000000e+01 x146 + 4.3000000000000000e+01 x147 + 1.6000000000000000e+01 x148 + 1.6000000000000000e+01 x149 + 3.5000000000000000e+01 x150
	 + 1.0000000000000000e+01 x152 + 2.8000000000000000e+01 x153 + 1.5000000000000000e+01 x154 + 2.9000000000000000e+01 x155 + 6.0000000000000000e+00 x156
	 + 3.0000000000000000e+01 x158 + 9.0000000000000000e+00 x159 + 1.2000000000000000e+01 x160 + 2.5000000000000000e+01 x161 + 1.0000000000000000e+01 x162
	 + 2.0000000000000000e+00 x164 + 2.8000000000000000e+01 x165 + 1.2000000000000000e+01 x166 + 2.4000000000000000e+01 x168 + 2.3000000000000000e+01 x169
	 + 2.2000000000000000e+01 x170 + 1.6000000000000000e+01 x171 + 1.6000000000000000e+01 x172 + 2.5000000000000000e+01 x173 + 3.1000000000000000e+01 x174
	 + 1.5000000000000000e+01 x175 + 2.3000000000000000e+01 x176 + 1.6000000000000000e+01 x178 + 2.7000000000000000e+01 x179 + 1.6000000000000000e+01 x180
	 + 1.9000000000000000e+01 x181 + 1.0000000000000000e+01 x183 + 1.3000000000000000e+01 x184 + 1.7000000000000000e+01 x185 + 2.5000000000000000e+01 x187
	 + 1.9000000000000000e+01 x188 + 1.2000000000000000e+01 x189 + 3.2000000000000000e+01 x190 + 1.9000000000000000e+01 x192 + 1.7000000000000000e+01 x193
	 + 2.2000000000000000e+01 x195 + 1.5000000000000000e+01 x196 + 1.6000000000000000e+01 x197 + 1.4000000000000000e+01 x198 + 1.1000000000000000e+01 x199
	 + 2.3000000000000000e+01 x201 + 3.4000000000000000e+01 x202 + 2.0000000000000000e+01 x204 + 2.5000000000000000e+01 x205 + 2.5000000000000000e+01 x207
	 + 2.2000000000000000e+01 x208 + 1.7000000000000000e+01 x209 + 2.0000000000000000e+00 x211 + 1.6000000000000000e+01 x212 + 3.1000000000000000e+01 x213
	 + 9.0000000000000000e+00 x214 + 2.3000000000000000e+01 x215 + 1.6000000000000000e+01 x217 + 1.9000000000000000e+01 x219 + 7.0000000000000000e+00 x220
	 + 2.9000000000000000e+01 x221 + 8.0000000000000000e+00 x222 + 2.9000000000000000e+01 x223 + 2.1000000000000000e+01 x224 + 3.0000000000000000e+00 x225
	 + 3.7000000000000000e+01 x227 + 1.6000000000000000e+01 x228 + 4.3000000000000000e+01 x229 + 1.5000000000000000e+01 x230 + 2.0000000000000000e+00 x232
	 + 4.0000000000000000e+01 x233 + 1.0000000000000000e+01 x235 + 3.7000000000000000e+01 x236 + 1.5000000000000000e+01 x237 + 2.1000000000000000e+01 x238
	 + 1.0000000000000000e+01 x239 + 2.3000000000000000e+01 x241 + 6.0000000000000000e+00 x242 + 1.0000000000000000e+01 x244 + 3.2000000000000000e+01 x245
	 + 2.1000000000000000e+01 x246 + 2.2000000000000000e+01 x247 + 1.4000000000000000e+01 x248 + 8.0000000000000000e+00 x249 - 8.0000000000000000e+00 x250
	 + 1.7000000000000000e+01 x251 + 1.7000000000000000e+01 x252 + 1.8000000000000000e+01 x253 + 4.3000000000000000e+01 x254 - 8.0000000000000000e+00 x255
	 + 4.2000000000000000e+01 x256 + 1.2000000000000000e+01 x257 + 2.4000000000000000e+01 x259 + 1.7000000000000000e+01 x260 + 1.2000000000000000e+01 x261
	 + 2.1000000000000000e+01 x262 + 1.7000000000000000e+01 x263 + 1.2000000000000000e+01 x264 + 1.3000000000000000e+01 x265 + 1.9000000000000000e+01 x266
	 + 1.6000000000000000e+01 x267 + 2.3000000000000000e+01 x268 + 2.9000000000000000e+01 x270 + 2.5000000000000000e+01 x271 + 2.5000000000000000e+01 x273
	 + 1.8000000000000000e+01 x274 + 7.0000000000000000e+00 x275 + 1.7000000000000000e+01 x276 + 1.0000000000000000e+01 x277
Subject To
Bounds
  x0 = 0.0000000000000000e+00
  x1 = 0.0000000000000000e+00
  x2 = 0.0000000000000000e+00
  x3 = 0.0000000000000000e+00
  x4 = 0.0000000000000000e+00
  x5 = 0.0000000000000000e+00
  x6 <= 1.0000000000000000e+00
  x7 <= 1.0000000000000000e+00
  x8 <= 1.0000000000000000e+00
  x9 <= 1.0000000000000000e+00
  x10 <= 1.0000000000000000e+00
  x11 = 0.0000000000000000e+00
  x12 <= 1.0000000000000000e+00
  x13 <= 1.0000000000000000e+00
  x14 <= 1.0000000000000000e+00
  x15 <= 1.0000000000000000e+00
  x16 <= 1.0000000000000000e+00
  x17 <= 1.0000000000000000e+00
  x18 <= 1.0000000000000000e+00
  x19 = 0.0000000000000000e+00
  x20 <= 1.0000000000000000e+00
  x21 <= 1.0000000000000000e+00
  x22 <= 1.0000000000000000e+00
  x23 = 0.0000000000000000e+00
  x24 = 0.0000000000000000e+00
  x25 <= 1.0000000000000000e+00
  x26 <= 1.0000000000000000e+00
  x27 = 0.0000000000000000e+00
  x28 <= 1.0000000000000000e+00
  x29 <= 1.0000000000000000e+00
  x30 <= 1.0000000000000000e+00
  x31 <= 1.0000000000000000e+00
  x32 <= 1.0000000000000000e+00
  x33 <= 1.0000000000000000e+00
  x34 <= 1.0000000000000000e+00
  x35 <= 1.0000000000000000e+00
  x36 = 0.0000000000000000e+00
  x37 <= 1.0000000000000000e+00
  x38 <= 1.0000000000000000e+00
  x39 <= 1.0000000000000000e+00
  x40 = 0.0000000000000000e+00
  x41 = 0.0000000000000000e+00
  x42 = 0.0000000000000000e+00
  x43 = 0.0000000000000000e+00
  x44 = 0.0000000000000000e+00
  x45 = 0.0000000000000000e+00
  x46 = 0.0000000000000000e+00
  x47 = 0.0000000000000000e+00
  x48 = 0.0000000000000000e+00
  x49 = 0.0000000000000000e+00
  x50 = 0.0000000000000000e+00
  x51 = 0.0000000000000000e+00
  x52 <= 1.0000000000000000e+00
  x53 <= 1.0000000000000000e+00
  x54 <= 1.0000000000000000e+00
  x55 <= 1.0000000000000000e+00
  x56 <= 1.0000000000000000e+00
  x57 <= 1.0000000000000000e+00
  x58 <= 1.0000000000000000e+00
  x59 <= 1.0000000000000000e+00
  x60 <= 1.0000000000000000e+00
  x61 <= 1.0000000000000000e+00
  x62 <= 1.0000000000000000e+00
  x63 <= 1.0000000000000000e+00
  x64 <= 1.0000000000000000e+00
  x65 <= 1.0000000000000000e+00
  x66 <= 1.0000000000000000e+00
  x67 <= 1.0000000000000000e+00
  x68 <= 1.0000000000000000e+00
  x69 = 0.0000000000000000e+00
  x70 <= 1.0000000000000000e+00
  x71 <= 1.0000000000000000e+00
  x72 = 0.0000000000000000e+00
  x73 <= 1.0000000000000000e+00
  x74 = 0.0000000000000000e+00
  x75 <= 1.0000000000000000e+00
  x76 <= 1.0000000000000000e+00
  x77 <= 1.0000000000000000e+00
  x78 <= 1.0000000000000000e+00
  x79 <= 1.0000000000000000e+00
  x80 = 1.0000000000000000e+00
  x81 <= 1.0000000000000000e+00
  x82 = 0.0000000000000000e+00
  x83 <= 1.0000000000000000e+00
  x84 = 1.0000000000000000e+00
  x85 <= 1.0000000000000000e+00
  x86 <= 1.0000000000000000e+00
  x87 <= 1.0000000000000000e+00
  x88 <= 1.0000000000000000e+00
  x89 <= 1.0000000000000000e+00
  x90 <= 1.0000000000000000e+00
  x91 = 0.0000000000000000e+00
  x92 = 0.0000000000000000e+00
  x93 = 0.0000000000000000e+00
  x94 = 0.0000000000000000e+00
  x95 = 0.0000000000000000e+00
  x96 = 0.0000000000000000e+00
  x97 = 0.0000000000000000e+00
  x98 = 0.0000000000000000e+00
  x99 = 0.0000000000000000e+00
  x100 = 0.0000000000000000e+00
  x101 = 0.0000000000000000e+00
  x102 = 0.0000000000000000e+00
  x103 = 0.0000000000000000e+00
  x104 = 0.0000000000000000e+00
  x105 = 0.0000000000000000e+00
  x106 = 0.0000000000000000e+00
  x107 = 0.0000000000000000e+00
  x108 = 0.0000000000000000e+00
  x109 = 0.0000000000000000e+00
  x110 = 0.0000000000000000e+00
  x111 = 0.0000000000000000e+00
  x112 <= 1.0000000000000000e+00
  x113 <= 1.0000000000000000e+00
  x114 <= 1.0000000000000000e+00
  x115 <= 1.0000000000000000e+00
  x116 <= 1.0000000000000000e+00
  x117 <= 1.0000000000000000e+00
  x118 <= 1.0000000000000000e+00
  x119 <= 1.0000000000000000e+00
  x120 <= 1.0000000000000000e+00
  x121 <= 1.0000000000000000e+00
  x122 <= 1.0000000000000000e+00
  x123 <= 1.0000000000000000e+00
  x124 <= 1.0000000000000000e+00
  x125 <= 1.0000000000000000e+00
  x126 <= 1.0000000000000000e+00
  x127 <= 1.0000000000000000e+00
  x128 <= 1.0000000000000000e+00
  x129 <= 1.0000000000000000e+00
  x130 <= 1.0000000000000000e+00
  x131 <= 1.0000000000000000e+00
  x132 <= 1.0000000000000000e+00
  x133 <= 1.0000000000000000e+00
  x134 <= 1.0000000000000000e+00
  x135 <= 1.0000000000000000e+00
  x136 = 1.0000000000000000e+00
  x137 <= 1.0000000000000000e+00
  x138 <= 1.0000000000000000e+00
  x139 <= 1.0000000000000000e+00
  x140 <= 1.0000000000000000e+00
  x141 <= 1.0000000000000000e+00
  x142 <= 1.0000000000000000e+00
  x143 <= 1.0000000000000000e+00
  x144 <= 1.0000000000000000e+00
  x145 <= 1.0000000000000000e+00
  x146 = 1.0000000000000000e+00
  x147 <= 1.0000000000000000e+00
  x148 <= 1.0000000000000000e+00
  x149 <= 1.0000000000000000e+00
  x150 <= 1.0000000000000000e+00
  x151 <= 1.0000000000000000e+00
  x152 <= 1.0000000000000000e+00
  x153 <= 1.0000000000000000e+00
  x154 <= 1.0000000000000000e+00
  x155 <= 1.0000000000000000e+00
  x156 <= 1.0000000000000000e+00
  x157 <= 1.0000000000000000e+00
  x158 <= 1.0000000000000000e+00
  x159 <= 1.0000000000000000e+00
  x160 <= 1.0000000000000000e+00
  x161 <= 1.0000000000000000e+00
  x162 <= 1.0000000000000000e+00
  x163 = 0.0000000000000000e+00
  x164 = 0.0000000000000000e+00
  x165 = 0.0000000000000000e+00
  x166 = 0.0000000000000000e+00
  x167 = 0.0000000000000000e+00
  x168 = 0.0000000000000000e+00
  x169 = 0.0000000000000000e+00
  x170 = 0.0000000000000000e+00
  x171 = 0.0000000000000000e+00
  x172 = 0.0000000000000000e+00
  x173 = 0.0000000000000000e+00
  x174 = 0.0000000000000000e+00
  x175 = 0.0000000000000000e+00
  x176 = 0.0000000000000000e+00
  x177 = 0.0000000000000000e+00
  x178 = 0.0000000000000000e+00
  x179 = 0.0000000000000000e+00
  x180 = 0.0000000000000000e+00
  x181 = 0.0000000000000000e+00
  x182 = 0.0000000000000000e+00
  x183 = 0.0000000000000000e+00
  x184 = 0.0000000000000000e+00
  x185 = 0.0000000000000000e+00
  x186 = 0.0000000000000000e+00
  x187 = 0.0000000000000000e+00
  x188 = 0.0000000000000000e+00
  x189 = 0.0000000000000000e+00
  x190 = 0.0000000000000000e+00
  x191 = 0.0000000000000000e+00
  x192 = 0.0000000000000000e+00
  x193 = 0.0000000000000000e+00
  x194 <= 1.0000000000000000e+00
  x195 <= 1.0000000000000000e+00
  x196 <= 1.0000000000000000e+00
  x197 <= 1.0000000000000000e+00
  x198 <= 1.0000000000000000e+00
  x199 = 0.0000000000000000e+00
  x200 = 0.0000000000000000e+00
  x201 <= 1.0000000000000000e+00
  x202 <= 1.0000000000000000e+00
  x203 = 0.0000000000000000e+00
  x204 = 0.0000000000000000e+00
  x205 = 0.0000000000000000e+00
  x206 = 0.0000000000000000e+00
  x207 = 0.0000000000000000e+00
  x208 = 0.0000000000000000e+00
  x209 = 0.0000000000000000e+00
  x210 <= 1.0000000000000000e+00
  x211 <= 1.0000000000000000e+00
  x212 <= 1.0000000000000000e+00
  x213 = 0.0000000000000000e+00
  x214 <= 1.0000000000000000e+00
  x215 = 0.0000000000000000e+00
  x216 <= 1.0000000000000000e+00
  x217 <= 1.0000000000000000e+00
  x218 <= 1.0000000000000000e+00
  x219 <= 1.0000000000000000e+00
  x220 <= 1.0000000000000000e+00
  x221 = 0.0000000000000000e+00
  x222 <= 1.0000000000000000e+00
  x223 <= 1.0000000000000000e+00
  x224 <= 1.0000000000000000e+00
  x225 <= 1.0000000000000000e+00
  x226 <= 1.0000000000000000e+00
  x227 <= 1.0000000000000000e+00
  x228 <= 1.0000000000000000e+00
  x229 <= 1.0000000000000000e+00
  x230 <= 1.0000000000000000e+00
  x231 = 0.0000000000000000e+00
  x232 = 0.0000000000000000e+00
  x233 = 0.0000000000000000e+00
  x234 <= 1.0000000000000000e+00
  x235 <= 1.0000000000000000e+00
  x236 <= 1.0000000000000000e+00
  x237 <= 1.0000000000000000e+00
  x238 <= 1.0000000000000000e+00
  x239 <= 1.0000000000000000e+00
  x240 <= 1.0000000000000000e+00
  x241 = 0.0000000000000000e+00
  x242 <= 1.0000000000000000e+00
  x243 <= 1.0000000000000000e+00
  x244 <= 1.0000000000000000e+00
  x245 = 0.0000000000000000e+00
  x246 <= 1.0000000000000000e+00
  x247 <= 1.0000000000000000e+00
  x248 <= 1.0000000000000000e+00
  x249 <= 1.0000000000000000e+00
  x250 <= 1.0000000000000000e+00
  x251 <= 1.0000000000000000e+00
  x252 <= 1.0000000000000000e+00
  x253 <= 1.0000000000000000e+00
  x254 <= 1.0000000000000000e+00
  x255 <= 1.0000000000000000e+00
  x256 <= 1.0000000000000000e+00
  x257 <= 1.0000000000000000e+00
  x258 <= 1.0000000000000000e+00
  x259 <= 1.0000000000000000e+00
  x260 <= 1.0000000000000000e+00
  x261 <= 1.0000000000000000e+00
  x262 = 0.0000000000000000e+00
  x263 <= 1.0000000000000000e+00
  x264 <= 1.0000000000000000e+00
  x265 <= 1.0000000000000000e+00
  x266 <= 1.0000000000000000e+00
  x267 <= 1.0000000000000000e+00
  x268 <= 1.0000000000000000e+00
  x269 <= 1.0000000000000000e+00
  x270 <= 1.0000000000000000e+00
  x271 = 0.0000000000000000e+00
  x272 <= 1.0000000000000000e+00
  x273 <= 1.0000000000000000e+00
  x274 <= 1.0000000000000000e+00
  x275 <= 1.0000000000000000e+00
  x276 <= 1.0000000000000000e+00
  x277 <= 1.0000000000000000e+00
  x278 <= 1.0000000000000000e+00
End

.wirteProblem()

m.writeProblem()

and

m.writeProblem('model_problem.lp')

These two methods creat files named model.cip or model.lp automatically. But the files are empty and the right content is outputed in the console.

[jurgen-lentz]

Can you please show me your code? Where did you exactly used the method in cpmp?

[syan-cn]

Can you please show me your code? Where did you exactly used the method in cpmp?

In the Use-Case 1: The Automatic Mode, I use these methods after .optimize().

m, *conss = build_model(n_locations, n_clusters, distances, demands, capacities)
m.optimize()
m.writeLP()

[jurgen-lentz]

Firstly, writeLP writes the current LP relaxation (see scipopt/PySCIPOpt#632). This is the reason why "the constraints aren't completed".

Secondly, the reason why writeProblem() outputs the right content on the console is because of the method m.redirectOutput() called in the cell before. You only need to delete the call of the method and writeProblem() will succeed.

[syan-cn]

Firstly, writeLP writes the current LP relaxation (see scipopt/PySCIPOpt#632). This is the reason why "the constraints aren't completed".

Secondly, the reason why writeProblem() outputs the right content on the console is because of the method m.redirectOutput() called in the cell before. You only need to delete the call of the method and writeProblem() will succeed.

Thank you very much! I just think wirteLP() method used to write .lp file. And writeProblem() succeed after I delete m.redirectOutput().