MATLAB: How to get the least used character in the text file

mode

    a= textread('GreatExpectations.txt','%c');
    [m]=length(a);
    most_used_letter=char(mode(0+a))

Best Answer

    %Sample text; equivalent to your a
    txt='this is a sample text.';
    uniqueChars=unique(txt(isletter(txt)));
    charCount=arrayfun(@(c) sum(txt==c), uniqueChars);
    % Now printing results
    fprintf('Char   count\n');
    fprintf(' %c     %d\n',[uniqueChars;charCount])
    fprintf('\nThe least Used Characters are:\n')
    fprintf('%c\n',uniqueChars(charCount==min(charCount)))
    fprintf('\nThe most Used Characters are:\n')
    fprintf('%c\n',uniqueChars(charCount==max(charCount)))
Once you run it you well get this:
Char   count
 a     2
 e     2
 h     1
 i     2
 l     1
 m     1
 p     1
 s     3
 t     3
 x     1
The least Used Characters are:
h
l
m
p
x
The most Used Characters are:
s
t
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