strings or char array?
Your notation would imply that you have 1x2 cell array, where each cell is itself a cell array (of size 4000x1 and 5000x1 respectively). Presumably each cell of these subcells are strings or char arrays?
Should each of the main two cell result in one char array (i.e one char array is the concatenation of the 4000 char array, and the other is the concatenation of 5000 char array), or should everything be concatenated together?
