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gams:getting_the_index_position_of_the_largest_element_of_a_set [2007/03/19 13:52] (current)
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 +====== Getting the index position of the largest element of a set ======
 +I have a problem of choosing indexes for the maximum value of a set.
 +''​Set i /i1*i5/, j /​j1*j10/''​ ''​a(i,​j)''​ is a set of value on i and j. Let  <​code>​Maxa = smax((i,j), a(i,​j));</​code>​ How do I get the index for i and j which lead to value ''​Maxa''?​
 +
 +Try: <​code>​
 +sets i /i1 * i5/,
 +     j /j1 * j4/,
 +     ​posmax(i,​j) '​position of largest element';​
 +parameter a(i,j) 'some data',
 +          maxa   '​largest element of a';
 +a(i,​j)=uniformint (1,100);
 +maxa = smax((i,j), a(i,j) ) ;
 +posmax(i,j) = a(i,j) = maxa ;
 +option decimals=0;
 +display a, maxa, posmax;
 +</​code>​
 +<​code>​
 +E x e c u t i o n
 +
 +----     23 PARAMETER a  some data
 +            j1          j2          j3          j4
 +i1          18          85          56          31
 +i2          30          23          35          86
 +i3           ​7 ​         51         ​100 ​         58
 +i4         ​100 ​         77          14          64
 +i5          16          26          67          44
 +
 +----     23 PARAMETER maxa                 ​= ​         100  largest elements of a
 +
 +----     23 SET posmax ​ position of largest element
 +            j1          j3
 +i3                     YES
 +i4         YES
 +</​code>​
  
IMPRESSUM / LEGAL NOTICEPRIVACY POLICY gams/getting_the_index_position_of_the_largest_element_of_a_set.txt ยท Last modified: 2007/03/19 13:52 (external edit)