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Single atom array
An array with a single atom is referred to as a singleton. All singletons with the same atom display the same way. However, the fact that they have different ranks affects how verbs act on them. This can be a pitfall for beginners. It is important to remember that if it displays like an atom, but does not behave like one, then check its rank.
atom =. 5
list =. 1 $ 5
atom
5
list NB. list looks like atom
5
atom + 23 23 23
28 28 28
list + 23 23 23 NB. but does not behave like atom
|length error
| list +23 23 23
# $ atom NB. rank of atom is 0
0
# $ list NB. rank of list is 1
1
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