diff -r d59bea55db9b -r c445c931472f examples/netgen.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/netgen.c	Mon Dec 06 13:09:21 2010 +0100
@@ -0,0 +1,141 @@
+/* netgen.c */
+
+/* This main program generates 50 original NETGEN instances of the
+   minimum cost flow problem and writes them in DIMACS format to the
+   current directory. */
+
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <glpk.h>
+
+static int parm[50][15] =
+{    {13502460, 101,
+      5000, 2500, 2500, 25000, 1, 100, 250000, 0, 0, 0, 100, 1, 1000,
+   },{4281922, 102,
+      5000, 2500, 2500, 25000, 1, 100, 2500000, 0, 0, 0, 100, 1, 1000,
+   },{44820113, 103,
+      5000, 2500, 2500, 25000, 1, 100, 6250000, 0, 0, 0, 100, 1, 1000,
+   },{13450451, 104,
+      5000, 2500, 2500, 25000, -100, -1, 250000, 0, 0, 0, 100, 1, 1000,
+   },{14719436, 105,
+      5000, 2500, 2500, 25000, 101, 200, 250000, 0, 0, 0, 100, 1, 1000,
+   },{17365786, 106,
+      5000, 2500, 2500, 12500, 1, 100, 125000, 0, 0, 0, 100, 1, 1000,
+   },{19540113, 107,
+      5000, 2500, 2500, 37500, 1, 100, 375000, 0, 0, 0, 100, 1, 1000,
+   },{19560313, 108,
+      5000, 2500, 2500, 50000, 1, 100, 500000, 0, 0, 0, 100, 1, 1000,
+   },{2403509, 109,
+      5000, 2500, 2500, 75000, 1, 100, 750000, 0, 0, 0, 100, 1, 1000,
+   },{92480414, 110,
+      5000, 2500, 2500, 12500, 1, 100, 250000, 0, 0, 0, 100, 1, 1000,
+   },{4230140, 111,
+      5000, 2500, 2500, 37500, 1, 100, 250000, 0, 0, 0, 100, 1, 1000,
+   },{10032490, 112,
+      5000, 2500, 2500, 50000, 1, 100, 250000, 0, 0, 0, 100, 1, 1000,
+   },{17307474, 113,
+      5000, 2500, 2500, 75000, 1, 100, 250000, 0, 0, 0, 100, 1, 1000,
+   },{4925114, 114,
+      5000, 500, 4500, 25000, 1, 100, 250000, 0, 0, 0, 100, 1, 1000,
+   },{19842704, 115,
+      5000, 1500, 3500, 25000, 1, 100, 250000, 0, 0, 0, 100, 1, 1000,
+   },{88392060, 116,
+      5000, 2500, 2500, 25000, 1, 100, 250000, 0, 0, 0, 0, 1, 1000,
+   },{12904407, 117,
+      5000, 2500, 2500, 12500, 1, 100, 125000, 0, 0, 0, 0, 1, 1000,
+   },{11811811, 118,
+      5000, 2500, 2500, 37500, 1, 100, 375000, 0, 0, 0, 0, 1, 1000,
+   },{90023593, 119,
+      5000, 2500, 2500, 50000, 1, 100, 500000, 0, 0, 0, 0, 1, 1000,
+   },{93028922, 120,
+      5000, 2500, 2500, 75000, 1, 100, 750000, 0, 0, 0, 0, 1, 1000,
+   },{72707401, 121,
+      5000, 50, 50, 25000, 1, 100, 250000, 50, 50, 0, 100, 1, 1000,
+   },{93040771, 122,
+      5000, 250, 250, 25000, 1, 100, 250000, 250, 250, 0, 100, 1, 1000,
+   },{70220611, 123,
+      5000, 500, 500, 25000, 1, 100, 250000, 500, 500, 0, 100, 1, 1000,
+   },{52774811, 124,
+      5000, 1000, 1000, 25000, 1, 100, 250000, 1000, 1000, 0, 100, 1,
+      1000,
+   },{22492311, 125,
+      5000, 1500, 1500, 25000, 1, 100, 250000, 1500, 1500, 0, 100, 1,
+      1000,
+   },{35269337, 126,
+      5000, 500, 500, 12500, 1, 100, 125000, 500, 500, 0, 100, 1, 1000,
+   },{30140502, 127,
+      5000, 500, 500, 37500, 1, 100, 375000, 500, 500, 0, 100, 1, 1000,
+   },{49205455, 128,
+      5000, 500, 500, 50000, 1, 100, 500000, 500, 500, 0, 100, 1, 1000,
+   },{42958341, 129,
+      5000, 500, 500, 75000, 1, 100, 750000, 500, 500, 0, 100, 1, 1000,
+   },{25440925, 130,
+      5000, 500, 500, 12500, 1, 100, 250000, 500, 500, 0, 100, 1, 1000,
+   },{75294924, 131,
+      5000, 500, 500, 37500, 1, 100, 250000, 500, 500, 0, 100, 1, 1000,
+   },{4463965, 132,
+      5000, 500, 500, 50000, 1, 100, 250000, 500, 500, 0, 100, 1, 1000,
+   },{13390427, 133,
+      5000, 500, 500, 75000, 1, 100, 250000, 500, 500, 0, 100, 1, 1000,
+   },{95250971, 134,
+      1000, 500, 500, 25000, 1, 100, 250000, 500, 500, 0, 100, 1, 1000,
+   },{54830522, 135,
+      2500, 500, 500, 25000, 1, 100, 250000, 500, 500, 0, 100, 1, 1000,
+   },{520593, 136,
+      7500, 500, 500, 25000, 1, 100, 250000, 500, 500, 0, 100, 1, 1000,
+   },{52900925, 137,
+      10000, 500, 500, 25000, 1, 100, 250000, 500, 500, 0, 100, 1, 1000,
+   },{22603395, 138,
+      5000, 500, 500, 25000, 1, 100, 250000, 500, 500, 0, 100, 1, 50,
+   },{55253099, 139,
+      5000, 500, 500, 25000, 1, 100, 250000, 500, 500, 0, 100, 1, 250,
+   },{75357001, 140,
+      5000, 500, 500, 25000, 1, 100, 250000, 500, 500, 0, 100, 1, 500,
+   },{10072459, 141,
+      5000, 500, 500, 25000, 1, 100, 250000, 500, 500, 0, 100, 1, 2500,
+   },{55728492, 142,
+      5000, 500, 500, 25000, 1, 100, 250000, 500, 500, 0, 100, 1, 5000,
+   },{593043, 143,
+      5000, 500, 500, 25000, 1, 100, 250000, 500, 500, 0, 0, 1, 1000,
+   },{94236572, 144,
+      5000, 500, 500, 25000, 1, 10, 250000, 500, 500, 0, 100, 1, 1000,
+   },{94882955, 145,
+      5000, 500, 500, 25000, 1, 1000, 250000, 500, 500, 0, 100, 1, 1000,
+   },{48489922, 146,
+      5000, 500, 500, 25000, 1, 10000, 250000, 500, 500, 0, 100, 1,
+      1000,
+   },{75578374, 147,
+      5000, 500, 500, 25000, -100, -1, 250000, 500, 500, 0, 100, 1,
+      1000,
+   },{44821152, 148,
+      5000, 500, 500, 25000, -50, 49, 250000, 500, 500, 0, 100, 1, 1000,
+   },{45224103, 149,
+      5000, 500, 500, 25000, 101, 200, 250000, 500, 500, 0, 100, 1,
+      1000,
+   },{63491741, 150,
+      5000, 500, 500, 25000, 1001, 1100, 250000, 500, 500, 0, 100, 1,
+      1000,
+   }
+};
+
+typedef struct { double rhs; } v_data;
+typedef struct { double cap, cost; } a_data;
+
+int main(void)
+{     glp_graph *G;
+      int k;
+      char fname[100+1];
+      G = glp_create_graph(sizeof(v_data), sizeof(a_data));
+      for (k = 1; k <= 50; k++)
+      {  sprintf(fname, "netgn%03d.min", parm[k-1][1]);
+         glp_netgen(G, offsetof(v_data, rhs), offsetof(a_data, cap),
+            offsetof(a_data, cost), &parm[k-1][-1]);
+         glp_write_mincost(G, offsetof(v_data, rhs), -1,
+            offsetof(a_data, cap), offsetof(a_data, cost), fname);
+      }
+      glp_delete_graph(G);
+      return 0;
+}
+
+/* eof */