how to read a letter from a string in a cell?

how to read a letter from a string in a cell?

Answer 1

[dpb]

Just as in any other cell addressing; use the indexed addressing mode--

>> whos s  % just happened to be in workspace at the moment...
  Name        Size            Bytes  Class    Attributes
  s         222x1             16706  cell               
>> s(1)       % the first cell
ans = 
    '-40.01'
>> s{1}       % the first cell content
ans =
  -40.01
>> s{1}(4)    % the fourth character in the cell content..
ans =
.
>>