So how to count no. of repeated letters occur in certain array>
for example i have a array
a
a
a
c
b
c
c
d
a
how can i know how may a,b,c,and occur? i want an output like this:
Alphabet count
a 4
c 3
b 1
d 1
so how can i do that? thanks
arr = {'a' 'a' 'a' 'c' 'b' 'c' 'c' 'd' 'a'}
%// map letters with numbers and count them
count = hist(cellfun(@(x) x - 96,arr))
%// filter result and convert to cell
countCell = num2cell(count(find(count)).') %'
%// get sorted list of unique letters
letters = unique(arr).' %'
%// output
outpur = [letters countCell]
The solution in the duplicate answer is very neat, applied to your desired output:
[letters,~,subs] = unique(arr)
countCell = num2cell(accumarray(subs(:),1,[],@sum))
output = [letters.' countCell]
It appears to me, that your input array rather looks like:
arr = ['a'; 'a'; 'a'; 'c'; 'b'; 'c'; 'c'; 'd'; 'a']
so change the last line to:
output = [cellstr(letters) countCell]
output =
'a' [4]
'b' [1]
'c' [3]
'd' [1]
