MATLAB: How to find which group of array belong to a certain position in a string

arraycell arrayMATLABstrings

Let's say I have 30 string. First I want to divide it into 5 string in each group. Second I want to find which group contain string between position ex, 11 to 23 from the original string? How do I do that?
aaSeq = 'MQRSPLEKASVFSKLFFSWTRPILRKGYRQ'; %my string
a = cellstr(reshape(aaSeq,5,[])')' %I divide into 5 string in each group

Best Answer

>> seq = 'MQRSPLEKASVFSKLFFSWTRPILRKGYRQ';
>> mat = reshape(aaSeq,5,[]).'
mat =
MQRSP
LEKAS
VFSKL
FFSWT
RPILR
KGYRQ
>> idx = reshape(1:numel(seq),5,[]).'
idx =
    1    2    3    4    5
    6    7    8    9   10
   11   12   13   14   15
   16   17   18   19   20
   21   22   23   24   25
   26   27   28   29   30
>> [grp,~] = find(any(idx>=11&idx<=23,2))
grp =
   3
   4
   5
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