Represent the two dimensional matrix using a 1D matrix and convert a(x,y)coordinante to a value in this array

if 2Da[3][4] = {00,01,02,03,10,11,12,13,20,21,22,23} is a two dimensional array, then the equivalent one dimensional array is 1Da[12] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11}

2Da[2,2] = 1Da[10] = 1Da[2*4+2]
2Da[2,0] = 1Da[8] = 1Da[2*4+0]
2Da[x,y] = 1Da[x*(2nd dim of 2Da)+y]