Jagged array

In C# and Java jagged arrays can be created with the following code:

int[][] c; c = new int[2][]; // creates 2 rows c[0] = new int[5]; // 5 columns for row 0 c[1] = new int[3]; // create 3 columns for row 1

In C and C++, a jagged array can be created (on the stack) using the following code:

int jagged_row0[] = {0,1}; int jagged_row1[] = {1,2,3}; int *jagged[] = { jagged_row0, jagged_row1 };

In C/C++, jagged arrays can also be created (on the heap) with an array of pointers:

int *jagged[5]; jagged[0] = malloc(sizeof(int) * 10); jagged[1] = malloc(sizeof(int) * 3);

In C++/CLI, jagged array can be created with the code:

using namespace System; int main() { array<array<double> ^> ^ Arrayname = gcnew array <array<double> ^> (4); // array contains 4 //elements return 0; }

In Fortran, a jagged array can be created using derived types with allocatable component(s):

type :: Jagged_type integer, allocatable :: row(:) end type Jagged_type type(Jagged_type) :: Jagged(3) Jagged(1)%row = [1] Jagged(2)%row = [1,2] Jagged(3)%row = [1,2,3]

In Python, jagged arrays are not native but one can use list comprehensions to create a multi-dimensional list which supports any dimensional matrix:

multi_list_3d = [[[] for i in range(3)] for i in range(3)] # Produces: [[[], [], []], [[], [], []], [[], [], []]] multi_list_5d = [[[] for i in range(5)] for i in range(5)] # Produces: [[[], [], [], [], []], [[], [], [], [], []], [[], [], [], [], []], [[], [], [], [], []], [[], [], [], [], []]]