Insert string into cell array beside data

I would like to insert string for indexing beside data currently i have just data [1;2;4;.....] but it has special position as own has so if i want to sort those easily, had better insert specific string in there. It has some rules, "R" 10times, then "C" 10times finally "L" also ten times... and repeat and repeat......

How can I insert specific repeated string(char)...

Answer 1

[dpb]

You can build character string sequences by memory manipulation just the same as numeric ones:

>> c='RCL';                             % the initial characters to replicate
>> N=10;                                % the replication count for each
>> c=reshape(repmat(c.',1,N).',1,[])    % a pattern of N of the substring
c =
RRRRRRRRRRCCCCCCCCCCLLLLLLLLLL
>>

Now just replicate that as needed and concatenate with the rest into a cell array.

M=3;  % say, whatever is multiplier need for final length
c=repmat(c.',M,1);

ADDENDUM

For brevity of presentation I purposely left the above as a row vector; the conversion to cellstr array should be obvious but just to make sure...

>> c=cellstr(reshape(repmat(c.',1,N).',[],1));
>> whos c
Name       Size            Bytes  Class    Attributes
c         30x1              1860  cell               
>>

Is the column cellstring array needed... NB: reordered the reshape to '[],1' so cellstr is working on a column character string array.