Find the position of the first non-zero value in a matrix
조회 수: 20 (최근 30일)
이전 댓글 표시
Hello, I have the matrix of the image below and I want the position of the first non-zero value of the columns 2 until the end
i used the cumsum expression, it finds the first non-zero values:
out = mymatrix(cumsum(cumsum(mymatrix~=0)) == 1)
but when I do the find((mymatrix(cumsum(cumsum(mymatrix~=0)) == 1)) the result is not the desirable
Has someone any idea?
thanks in advance!
댓글 수: 0
채택된 답변
KSSV
2021년 4월 30일
A = rand(10) ;
idx = randperm(10*10,80);
A(idx) = 0 ;
iwant = zeros(1,10) ;
for i = 1:10
iwant(i) = find(A(:,i),1) ;
end
iwant
댓글 수: 3
KSSV
2021년 5월 1일
Hi yes you are right, sometimes it will not run. When there is no non-zero element in a column the positon will be empty and in that case it will trhrow werror.
I am creating a demo random data for shwoing the solution to problem. To keep zeros randomly, I have used randperm. You can apply the solution to your data striaghtaway.
추가 답변 (0개)
참고 항목
제품
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!