MATLAB: How to cell array all data into a matrices

Question

suppose i have a cell array

 a={{1,2,3};12;{21,32,43}};

how to get all data in single matrix

 b=[1,2,3,12,21,32,43]'

Answer 1

Use horzcat and cell2mat:

b = cell2mat(horzcat(a{:}))

produces:

b =
       1     2     3    12    21    32    43

I didn’t initially see the transpose operator. To get it as a column vector, add the transpose:

b = cell2mat(horzcat(a{:}))'