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gams:getting_the_index_position_of_the_largest_element_of_a_set

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Getting the index position of the largest element of a parameter

I have a problem of choosing indexes for the maximum value of a parameter. Let a(i,j) be a parameter with Sets i /i1*i5/, j /j1*j10/. Let

Maxa = smax((i,j), a(i,j));

How do I get the index for i and j which lead to value Maxa?

Try:

Set 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;
----     13 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


----     13 PARAMETER maxa                 =          100  largest element of a

----     13 SET posmax  position of largest element

            j1          j3

i3                     YES
i4         YES
IMPRESSUM / LEGAL NOTICEPRIVACY POLICY gams/getting_the_index_position_of_the_largest_element_of_a_set.1590419288.txt.gz · Last modified: 2020/05/25 17:08 by Lutz Westermann