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Array
Atoms, lists, and tables are all arrays. All nouns in J are arrays. Atoms have 0 dimensions, lists have 1 dimension, and tables have 2 dimensions. This extends to higher dimension arrays.
The primitive $, discussed earlier with lists and tables also works with higher dimension arrays.
2 3 4 $ i. 24
0 1 2 3
4 5 6 7
8 9 10 11
12 13 14 15
16 17 18 19
20 21 22 23
The above is a 3-dimensional array. The blank line indicates the break between the 1st dimension and the 2nd and 3rd.
b =. 2 3 4 $ 'abcdef'
$ b
2 3 4
The monad i. also works with higher dimension arrays.
i. 2 3 4
0 1 2 3
4 5 6 7
8 9 10 11
12 13 14 15
16 17 18 19
20 21 22 23
The J terms atom, list, and table are analogous to the math terms of scalar, vector, and matrix.
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