How can I count the occurrences of each element in a matrix in MATLAB?
조회 수: 22 (최근 30일)
이전 댓글 표시
I'm trying to figure out how to count how often certain numbers appear in a specific column of my matrix (each number is coded for a different category). Very new to MATLAB, any help is appreciated!
댓글 수: 0
채택된 답변
Geoff Hayes
2017년 5월 25일
Tracy - one way is to use ismemeber (though this can be "slow"). For example, suppose your column array is constructed as
c = randi(15, 25, 1); % so generate 25 random numbers from 1 to 15
m = [10 15]; % m is the set of integers that you trying to match on
sum(ismember(c,m))
Since ismember(c,m) returns a logical array of ones (indicating a match in m) and zeros (indicating no match) then we can sum up all the ones to determine how many elements of c are in m.
Note that the above is only valid for integers.
댓글 수: 0
추가 답변 (0개)
참고 항목
카테고리
Help Center 및 File Exchange에서 Logical에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!