[Help-glpk] Tridimensional data

[Carlos Herrera]

hello world,

how I can write data in three dimension index in mathprog, for example

set post; /* 1..T */
set posy;   /* 1..m */
set posx;  /* 1..n */

param distance {t in post, i in posy, j in posx};
var y {t in post, i in posy, j in posx} binary >=0;

maximize z: sum{t in post, i in posi, j in posx} distance[t,i,j] * y[t,i,j];

data;

param distance: ???

thanks!!