Table

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A table is a two dimensional array of atoms. Tables cannot be written directly as a constant as can an atom or a list, but instead must be created with a primitive. The dyad $ (shape) can create tables. The left argument indicates the count of items in each dimension and the right argument provides items to populate the table.

   2 3 $ 7	NB. a 2 by 3 table of 7's
7 7 7
7 7 7
   2 3 $ 7 8 9 10 11 12
 7  8  9
10 11 12
   2 3 $ 7 8	NB. cycle through atoms to get enough
7 8 7
8 7 8
   3 4 $ 'abcdefghijklmnopqrstuv'
abcd
efgh
ijkl

The monad $ (shape of) gives the shape of its argument. The shape is the list of the count of atoms in each dimension of the argument.

   a =. 2 3 $ 7
   $ a
2 3

The monad i. (integers), introduced earlier for creating a list of integers, can be used to create tables of integers.

   i.5		NB. list of 5 integers
0 1 2 3 4
   i. 2 3	NB. 2 by 3 table of integers
0 1 2
3 4 5

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