Function Reference
— Built-in Function: size (a, n)

Return the number 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