finding nonzero elements in matrix

1 次查看（过去 30 天）
Tilek Zhumabek
Tilek Zhumabek 2020-2-10
编辑： KSSV 2020-2-11
Hello,
I have a matrix with the values of either zero or one; I want to find non zero elements in every coloumn and locate the indices of each non zero element in every coloumn of a new matrix. For example, let's say my original matrix looks like this:
a =
0 1 1
0 0 1
1 1 1
I want the indices of non zero element in a new matrix look like this:
b =
0 1 1
0 0 2
3 3 3
How can I do it? I tried with the find function but without any success.
Thanks in advance,
Tilek

请先登录，再回答此问题。

采纳的回答

KSSV
KSSV 2020-2-10
编辑：KSSV 2020-2-10
iwant = zeros(size(A)) ;
for i = 1:size(A,1)
if any(A(i,:))
iwant(i,A(i,:)~=0) = i ;
end
end

更多回答（1 个）

Steven Lord
Steven Lord 2020-2-10
Use implicit expansion.
A = [0 1 1; 0 0 1; 1 1 1];
R = (1:size(A, 1)).';
B = A.*R
  3 个评论
显示 1更早的评论
KSSV
KSSV 2020-2-11
+1 ...I tried without using loop....it didn't flash in my mind that time.
KSSV
KSSV 2020-2-11
编辑：KSSV 2020-2-11
@Tilek Zhumabek this is the best answer compared to mine. You should accept this answer.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 MATLAB 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by