find where number changes in a matrix

1 回表示 (過去 30 日間)
joseph Frank
joseph Frank 2013 年 3 月 23 日
I have a matrix of +1 and -1 values. I want to find where the number flips from 1 to -1 or vice versa where the change is a change from column to column.
X=[...
1 1 1 1;
1 -1 1 1;
1 1 1 -1;
1 1 1 1]
the answer should be [2,2],[2,3]and [3,4]. I tried
find(diff(X)==2);
find(diff(X)==-2);
Any help is appreciated

採用された回答

Cedric
Cedric 2013 年 3 月 23 日
>> [r,c] = find(diff(X,1,2)) ;
>> loc = [r, c+1]
loc =
2 2
2 3
3 4

その他の回答 (1 件)

the cyclist
the cyclist 2013 年 3 月 23 日
One way:
[i j] = find(abs([zeros(4,1),diff(X,[],2)])==2)

カテゴリ

Help Center および File ExchangeLoops and Conditional Statements についてさらに検索

タグ

Community Treasure Hunt

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

Start Hunting!

Translated by