The number of elements in array. If array is one-dimensional (1D), size(s) returns a 32-bit integer. If array is multidimensional, size(s) returns a 1D array in which each element is a 32-bit integer that represents the number of elements in the corresponding dimension of array. The order of elements in the return array corresponds to row-major order. Thus, vol is the first index, followed by page, row, and column. These names are index identifiers and have no other meaning.