Originally posted by: JPatrick

Hi,  

When I try to define a int parameter value using:

int Blanks [Tests,Days]=...;

string NumberOfWeeks = Blanks[1,Days];
int W = NumberOfWeeks.lastIndexOf("10");

Blanks is a matrix with zeros and ones and I am trying to find the index of the highest value d in  "Days" for which Blanks[1,d] contains a 1 in it.  The error message I get is

"sytnax error, unexpected '(', expecting ';'

I also tried using last-index-of instead and go the message

"expecting a tuple and got a string"

JP

Hi,

let me give you an example :

range Tests=1..4;
range Days=1..3;

int Blanks [Tests,Days]=[[0, 0, 1],[1, 1, 0],[0, 0 ,0],[1,1,1]];

int maxOfDaysWith1[t in Tests]=max(d in Days:Blanks[t,d]==1) d;

execute
{
writeln(Blanks);
writeln(maxOfDaysWith1);
}

which gives

[[0 0 1]
         [1 1 0]
         [0 0 0]
         [1 1 1]]
 [3 2 -9007199254740991 3]

regards

Originally posted by: JPatrick

That works.  Thanks.

Originally posted by: JPatrick

On a separate question....  when a constraint is violated OPL will tell me by giving me something like 

Constraint#0#1#2 

I understand that the numbers refer to the indices of the constraint.  What I am wondering about is the ordering if the indices are not numbers. For instance, I have indices that consist of a list of initials.  Does OPL maintain the order in which the list was read into it from Excel?  Does it order them alphabetically so that #0 would refer to the first initials in an alphabetized list?