>> disp([char(str) num2str(arr,' %d')])
A 1
B 2
C 3
>>
disp only takes a single argument and have to dereference the cell array and combine into character string array. To be able to concatenate to the numeric array, have to convert them to string as well.
Looping and fprintf is often just as simple to handle each row at a time.
For the latter ?, Matlab doesn't care whether the inputs to colon are characters...
>> ['A':'C'].'
ans =
A
B
C
>>
