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size

size(x)

Calculate the size of a matrix.

Try it yourself:

$1	size(2.3)
$2	size("hello world")
$3	a = [1, 2; 3, 4; 5, 6]
$4	size(a)
$5	size(1:6)

See also:

concat count det diag identity inv ones range squeeze subset trace transpose zeros