清空筛选条件
清空筛选条件

How to Convert vector elements to zero for certain N length when its values gets negative?

1 次查看（过去 30 天）
Sagar Dhage
Sagar Dhage 2014-8-6
评论： Sagar Dhage 2014-8-7
I have a column vector F= (0; 0; 0; 0; 5; 7; 12; 11; 23; 32; 22; 10; 8; -6 0; -8; 1; 4; 8; -5; 0; 0; 0; 6; 8; 9; 13; 14; 12; 23; 34; 22; 16; 17; 4; -5 ; -6; 5; 7; 0; 0; 0)
I want to convert values of F when it gets negative (in this case -6 and -5) till N (lets N=8)
so result would be F= (0; 0; 0; 0; 5; 7; 12; 11; 23; 32; 22; 10; 8; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 6; 8; 9; 13; 14; 12; 23; 34; 22; 16; 17; 4; 0; 0; 0; 0; 0; 0; 0) how to do this?

请先登录，再回答此问题。

采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2014-8-6
F(F<0 & F>=-8)=0
  3 个评论
显示 1更早的评论
Azzi Abdelmalek
Azzi Abdelmalek 2014-8-6
编辑：Azzi Abdelmalek 2014-8-6
F= [0; 0; 0; 0; 5; 7; 12; 11; 23; 32; 22; 10; 8; -6 ;0; -8; 1; 4; 8; -5; 0; 0; 0; 6; 8; 9; 13; 14; 12; 23; 34; 22; 16; 17; 4; -5 ; -6; 5; 7; 0; 0; 0]
idx=find(F<0,1)
n=numel(F);
while ~isempty(idx)
F(idx:min(idx+7,n))=0;
idx=find(F'<0,1);
end

请先登录，再进行评论。

更多回答（3 个）

Yu Jiang
Yu Jiang 2014-8-6
编辑：Yu Jiang 2014-8-6
while ~isempty(find(F<0))
id1 = find(F<0,1);
id2 = min(id1 + 7, length(F));
F(id1:id2) = 0;
end
Roger Stafford
Roger Stafford 2014-8-6
I am not sure what you mean in your remark "till N (lets N=8)". Do you mean that a maximum of N successive negative values in F are to be converted to 0 with all the possible remaining negative values, if any, unaffected? If so, the example you should have used ought to have demonstrated that behavior. In any case, here is code that would accomplish such a task:
F(find(F<0,N)) = 0;
  1 个评论
Sagar Dhage
Sagar Dhage 2014-8-6
N is next 8 values from -6 and -5. I want to convert all positive and negative values to 0 for this N=8 length. that is all values in old should be zero. your formula converts only negative.

请先登录，再进行评论。

Roger Stafford
Roger Stafford 2014-8-6
I think I understand you now. How about this:
n = length(F);
for k = 1:n
if F(k) < 0
F(k:min(k+N-1,n)) = 0;
end
end

类别

在 Help Center 和 File Exchange 中查找有关 Report Generator Utilities 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