How to create a cell array identical in size, but containing cell position in each cell?

I have a cell array, with different number of elements in each cell. I convert the cells to a 1xn matrix with

For example,

A = {[1,2,3,4]; [1,2,5]; [5,6,1,2,4]; [44]}

A = 4×1 cell array
    {[  1 2 3 4]}
    {[    1 2 5]}
    {[5 6 1 2 4]}
    {[       44]}

I want to create a new cell array which is identical in size to A containing cell number as element sof each of the cell such that the output would look like -

B = {[1,1,1,1,]; [2,2,2]; [3,3,3,3,3]; [4]}

B = 4×1 cell array
    {[  1 1 1 1]}
    {[    2 2 2]}
    {[3 3 3 3 3]}
    {[        4]}

How can I make this?

Answer 1

[G A]

A = {[1,2,3,4]; [1,2,5]; [5,6,1,2,4]; [44]}
B = cell(size(A));
for k = 1:length(A)
    B{k} = repmat(k,1,length(A{k}));
end