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C++ API

Built-in Function: size (a)

Built-in Function: size (a, dim)

Return the number of rows and columns of a.

With one input argument and one output argument, the result is returned in a row vector. If there are multiple output arguments, the number of rows is assigned to the first, and the number of columns to the second, etc. For example:

size ([1, 2; 3, 4; 5, 6])
  ⇒ [ 3, 2 ]

[nr, nc] = size ([1, 2; 3, 4; 5, 6])
   ⇒ nr = 3
   ⇒ nc = 2

If given a second argument, size will return the size of the corresponding dimension. For example,

size ([1, 2; 3, 4; 5, 6], 2)
   ⇒ 2

returns the number of columns in the given matrix.

See also: numel, ndims, length, rows, columns.

Package: octave