⍴ — Shape or Reshape — Keystroke ALT+r — Character 9076

Note: This is ALT+r; ALT+SHIFT+R will generate the symbol root (√).

Reshape

Z←L⍴R

returns an array of shape L whose items are taken from R in row major order, repeated as necessary.

L is a scalar or vector of non-negative integers, and R is an arbitrary array.

If the right argument is empty, the result consists of ×/⍴L copies of the fill item of R.

For example, in origin-1

2 3⍴⍳6
1 2 3
4 5 6
2 3⍴⍳0
0 0 0
0 0 0

The idea for the latter enhancement was taken from Dyalog APL.

The symbol ⍴ used with no left argument returns the size or dimensions of a scalar, string, vector, array or matrix.

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