editing in string array

a={'10','7','5','9','11','12','12','4'}

I want to put 0 at the starting of all those whose length is 1. How can I do this easily?

Answer 1

[KSSV]

a={'10','7','5','9','11','12','12','4'} ;
L = cellfun(@length,a) ;
idx = L==1 ;

a(idx) = strcat('0',a(idx)) ;

[ANKUR KUMAR]

Could you please help me to explain, when to use @cellfun and when to use @arrayfun

[KSSV]

cellfun works on the cells.....it is nothing but a for loop on each cell. arrayfun works on rows/ cols of matrices.

[Stephen23]

More accurately:

• cellfun applies the function to the contents of each cell of a cell array.
• arrayfun applies the function to each element of any array (which could be numeric, cell, etc).

Use whichever suits your purpose.