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How to find out point of change of sequence of ones and zeros?

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Hello,
I have this matrice:
1 NaN 3.28000000000000
1 NaN 3.32000000000000
1 NaN 3.36000000000000
1 NaN 3.40000000000000
0 0.0320040000000000 3.44000000000000
0 0.0697230000000000 3.48000000000000
0 0.124815600000000 3.52000000000000
0 0.158877000000000 3.56000000000000
and I would like to have another column where would be just the number where the first column changes from 1 to 0.
Result should be like this:
1 NaN 3.28000000000000
1 NaN 3.32000000000000
1 NaN 3.36000000000000
1 NaN 3.40000000000000 3.40000000000000
0 0.0320040000000000 3.44000000000000
0 0.0697230000000000 3.48000000000000
0 0.124815600000000 3.52000000000000
0 0.158877000000000 3.56000000000000

Risposta accettata

Jan
Jan il 27 Lug 2021
Modificato: Jan il 28 Lug 2021
What do you expect in the other rows of the 4th column? All rows must have the same number of columns, according to the definition of a matrix. If zeros are fine:
index = find(A(:, 1) == 0, 1) - 1; % [EDITED, -1 appended]
if any(index)
A(index, 4) = A(index, 3);
end
  5 Commenti
Jan
Jan il 28 Lug 2021
Now you post another input, but do not mention, what you expect as output.
  • If you still want to use the first change from 1 to 0, use the code of my answer.
  • If you want to find all changes from 1 to 0:
index = strfind(A(:, 1).', [1, 0]);
B = A(index, 3);
% Alternative:
index = diff(A(:,1)) < 0;

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