How to extract the first and last position for each ones series ?
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For example
How to extract the first and last position for each ones series ?
X= [0 0 1 1 1 0 1 1 0 1 1 1 0 0 1 ]
%result
y =
3 5
7 8
10 12
15 15
Thanks
1 件のコメント
Cedric
2013 年 1 月 23 日
If it is for indexing something else afterwards, you can use that almost directly for logical indexing; you just have to typecast it to logical. E.g.
>> X = [0 0 1 1 1 0 1 1 0 1 1 1 0 0 1 ] ;
>> a = 1:15 ;
>> a(logical(X))
ans =
3 4 5 7 8 10 11 12 15
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その他の回答 (3 件)
Roger Stafford
2013 年 1 月 23 日
f = find([false,diff(x)~=0,false]);
y = [f(1:2:end)',f(2:2:end)'-1];
0 件のコメント
Azzi Abdelmalek
2013 年 1 月 23 日
You can use
x= [ 0 0 1 1 1 0 1 1 0 1 1 1 0 0 1 ]
y=[x(1) diff(x)] % to find the first column
x1=fliplr(x) % to find the second column by the first method, just by
% reversing x
0 件のコメント
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