CODEWITHSUNDEEP
matlab
interstellar
interstellar

Reputation: 399

Counting occurrences of a character in a string within a cell

I'm having trouble figuring out how to count the occurrences of a character in a string within a cell. For example, I have a file that contains information like so:

type
m
mmNs
SmNm

and I'm trying to determine how many m's are in each line. To do this, I've tried this code:

sampleddata = dataset('file','sample.txt','Delimiter','\t');
muts = sampleddata.type;
fileID = fopen('number_occur.txt','w');
for j = 1:3
    mutations = muts(j)
    M = length(find(mutations == 'm'));
    fprintf(fileID, '%1f\n',M)
end
fclose(fileID)

However, I get an error that informs me: "Undefined operator '==' for input arguments of type 'cell'." Does anyone know how to overcome this problem?

Upvotes: 0

Views: 110

Answers (1)

GameOfThrows
GameOfThrows

Reputation: 4510

Gonna post a result here in case you did not find a way to do it. There are loads of ways to do it, I am just going to put one of them.

Basically, you want a regex to do string matches:

a = {'type';
'm';
'mmNs';
'SmNm';
'mmmmM'} %//Load in Data,
pattern = 'm'; %//The pattern you are looking for is 'm', it could be anything really, a number of specific word or a specific pattern
lines = regexp(a, pattern, 'tokens'); %// look for this pattern in each line
result = cellfun('length',lines); %//count the size of matched patterns, so each time it matches, the size should increase by 1.

This gives the result in a matrix form:

result =

 0
 1
 2
 2
 4

Upvotes: 2

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