清空筛选条件
清空筛选条件

how find last row<>0

2 次查看（过去 30 天）
piero
piero 2023-8-12
评论： piero 2023-8-12
a=[3 4 5 0 3 4 0;4 5 0 0 0 0 0;0 0 0 0 0 0 0]
a =
3 4 5 0 3 4 0
4 5 0 0 0 0 0
0 0 0 0 0 0 0
i want to know the last rows wich element are ==0 ..solution idx=2!
i try this solution :find(sum(a,2)==0)-1 but it's no good because example :the sum 3 3 0 -3 -3 0 =0 but is not correct
  2 个评论
Dyuman Joshi
Dyuman Joshi 2023-8-12
Ran in:
Your phrasing is not clear (atleast to me).
a=[3 4 5 0 3 4 0;4 5 0 0 0 0 0;0 0 0 0 0 0 0]
a = 3×7
3 4 5 0 3 4 0 4 5 0 0 0 0 0 0 0 0 0 0 0 0
As you said, the output for the above array is 2, what is the logic behind that?
piero
piero 2023-8-12
a=flip(a)
for i=1:height(a)
if sum(a(i,:),2)>0 and sum(a(i+1,:),2)==0
memRow=i;
break;
end
end
t's similar this code but i don't to use loop and sum
I want to store the idx of the last row where there is at least one number <>0

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Matt J
Matt J 2023-8-12
idx = find(~any(a,2),1,'last')-1

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 2-D and 3-D Plots 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