Count the number of occurrences in a string vector

조회 수: 15(최근 30일)
buhmatlab 2020년 4월 7일
편집: Andrei Bobrov 2020년 4월 7일
I'm relatively new to Matlab because I only used Excel so far. For my project I used the COUNTIFS function and I'm wondering how to do this in Matlab.
Say I've got a column vector 300x1:
I want to create a vector of the same size that counts and sums up each entry.
If my entries are A;A;B;A;B;B;C;A;C the new vector should look like: 1;2;1;3;2;3;1;4;2
Thank you so much!

채택된 답변

Andrei Bobrov
Andrei Bobrov 2020년 4월 7일
편집: Andrei Bobrov 2020년 4월 7일
s = string({'A';'A';'B';'A';'B';'B';'C';'A';'C'});
out = zeros(numel(s),1);
[~,~,c] = unique(s);
for i = 1:max(c)
lo = c == i;
out(lo) = 1:sum(lo);
[~,~,c] = unique(s);
z = c == (1:max(c)); % or use here: z = bsxfun(@eq,c,1:max(c));
out = sum(cumsum(z).*z,2);
I'm use R2016b.
  댓글 수: 1
buhmatlab 2020년 4월 7일
This works perfectly! I wonder how long it would have taken for me to figure this out...

댓글을 달려면 로그인하십시오.

추가 답변(0개)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by