Change sequence of consecutive trues to falses, in logical array

1 回表示 (過去 30 日間)
Enrico Gambini
Enrico Gambini 2022 年 10 月 13 日
編集済み: Bruno Luong 2022 年 10 月 13 日
Hello guys!
I would like to find a fast procedure to change from true to false the consecutive trues in a logical array excluding only the first and the last true in the sequence.
For instance:
x=[true;false;false;true;true;true;true;true];
Desired output array should be:
output=[true;false;false;true;false;false;false;true];
Hope the question is clear.
Thank you!

採用された回答

Bruno Luong
Bruno Luong 2022 年 10 月 13 日
編集済み: Bruno Luong 2022 年 10 月 13 日
x=[true;false;false;true;true;true;true;true;false;true]'
x = 1×10 logical array
1 0 0 1 1 1 1 1 0 1
x & ~([false,x(1:end-1)]&[x(2:end),false])
ans = 1×10 logical array
1 0 0 1 0 0 0 1 0 1

その他の回答 (1 件)

Chunru
Chunru 2022 年 10 月 13 日
x=[true;false;false;true;true;true;true;true]'
x = 1×8 logical array
1 0 0 1 1 1 1 1
output = x;
dx = diff(x(1:end-1))
dx = 1×6
-1 0 1 0 0 0
output1 = output(2:end-1);
output1(output1 & (dx==0)) = false;
% Desired output array should be:
output(2:end-1) = output1;
output
output = 1×8 logical array
1 0 0 1 0 0 0 1
% Desired
[true;false;false;true;false;false;false;true]'
ans = 1×8 logical array
1 0 0 1 0 0 0 1
  1 件のコメント
Enrico Gambini
Enrico Gambini 2022 年 10 月 13 日
Thank you for the answer!
It does not work if a false is present after the last true of each sequence, for instance, if I had a vector like this:
x=[true;false;false;true;true;true;true;true;false;true]'
x = 1×10 logical array
1 0 0 1 1 1 1 1 0 1
output = x;
dx = diff(x(1:end-1))
dx = 1×8
-1 0 1 0 0 0 0 -1
output1 = output(2:end-1);
output1(output1 & (dx==0)) = false;
% Desired output array should be:
output(2:end-1) = output1;
output
output = 1×10 logical array
1 0 0 1 0 0 0 0 0 1
%Desired should be
[1,0,0,1,0,0,0,1,0,1]
ans = 1×10
1 0 0 1 0 0 0 1 0 1
I really need to automate this procedure and be sure it is robust, since I am dealing with very large array.
Thank you

サインインしてコメントする。

カテゴリ

Help Center および File ExchangeMultidimensional Arrays についてさらに検索

製品


リリース

R2021a

Community Treasure Hunt

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

Start Hunting!

Translated by