MATLAB: How to count the number of each character from a text file (and the frequency of it)

characterdoit4meletterno attempttext file

Create a function that takes a text file as input and returns a vector of size 26 with the frequency in percent of each character a, b, . . . z (not sensitive to case.) The frequency must be computed as the number of occurences divided by the total number of characters from a to z that occur, multiplied by one hundred. All other letters such as ø and ä as well as all symbols must be ignored.

Best Answer

s=importdata('file.txt')
str=upper(s(:))
str=[str{:}]
AZ='A':'Z'
long=sum(ismember(str,AZ));
for k=1:numel(AZ)
  freq(k,1)=100*sum(ismember(str,AZ(k)))/long
end
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