Matrix

From CometPublic

Comet support matrices (multi-dimentional arrays). The comet declaration

   int m[1..10,10..100];

declares a 2-D matrix of integers with 10 rows and 91 columns. It can be accessed and modified as follows

   m[2,5] = x;
   int y = m[2,5];

You may initialize the matrix with a default value

   int m[1..10,10..100] = 1;

As with arrays matrices can also be populated at creation time if you know the dimension of the matrix

   int m[1..2,1..2] = [[1,2],[3,4]];

A reference to entire matrix can be created and assigned as follow

   int[,] w = m;

In the statement above, w and m are two aliases for the same matrix. Notice the use of the [,] notation next to w's type to indicate that w is a 2-D matrix of integers. All matrices are objects of the matrix type and therefore implement the following API

   class matrix{T} {
      void setName(string);
      int arity();
      int low(int);
      int up(int);
      int sz(int);
      range rng(int);
   }

The last four methods (low,up,sz,rng) take as an argument the dimension identifier that must range in 0..m.arity()-1.