CODEWITHSUNDEEP
matlab
user2458552
user2458552

Reputation: 419

counting number of strings in a vector in matlab

suppose I have a vector of string as follows

'1 2'
'1'
'1'
'1'
'1'
'1'
'1'
'1'
'1'
'1'

how can I obtain the frequency of the strings from this vector? Unique() isnt working and gives the error Error using cell/unique Input A must be a cell array of strings.

Upvotes: 0

Views: 152

Answers (2)

Divakar
Divakar

Reputation: 221574

Though kyamagu's answer looks like the simplest to follow, I am bringing this for the love of bsxfun and vectorization -

all_nums = char(INPUT_CELLARRAY);
unique_nums = unique(all_nums,'rows');
t1 = all_nums-'0';
t2 = permute(unique_nums-'0',[3 2 1]);
strings = cellstr(unique_nums)
count = squeeze(sum(all(bsxfun(@eq,t1,t2),2),1))

Output

strings = 

    '1'
    '1 2'


count =

     9
     1

Upvotes: 1

kyamagu
kyamagu

Reputation: 551

I guess you contain a non-char element in your vector. You should first convert your vector to a valid cellstr.

string_vector = your_vector(cellfun(@ischar, your_vector));
[unique_strings, ~, indices] = unique(string_vector);
frequencies = accumarray(indices(:), 1);

Upvotes: 4

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