Finding the indexes of first zero value in rows of a matrix?

3 次查看（过去 30 天）
Marmar
Marmar 2017-11-27
评论： Marmar 2017-11-28
Hi all, I have a matrix full of zero and one. However, I just want to have a vector including the index (Column number) of the first zero in each row. Any suggestion and help really appreciated.

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2017-11-28
index_first_row_zero = sum( cumprod(logical(YourMatrix), 2), 2) + 1;
Note: in the case where none of the entries are 0, this returns one more than the width. You did not define the desired output for this case.
index_last_nonzero = size(YourMatrix,2) - sum( cumprod( ~logical(YourMatrix), 2, 'reverse'), 2);
Note: in the case where all of the entries are 0, this returns 0. You did not define the desired output for this case.

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Creating and Concatenating Matrices 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