Keep pairs of corresponding elements in 2 vectors based on conditions
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fadams18
el 14 de Mzo. de 2023
Editada: Dyuman Joshi
el 16 de Mzo. de 2023
I have the problem here: Using this image below: I want to check for several conditions
the orange and green marks are annotations on a signal. If we consider vectors orange, and green which contain the points needed to make the annotations.
The point is to have perfect pairs and ignore all others. i.e. orange(i) and green(i) is a pair if orange(i)<green(i)
so all values in vector orange are lower than their corresponding elements in vector green.
I want to check the following conditions.
I started but some conditions dont work, thats why i need help.
Condition 1: orange must always begin, so if a green begins I delete that green point. [done]
condition 2: if 2 or more greens come before an orange, delete all unecessary green to keep a pair.
condition 3: similarly if several orange exist delete them to keep a pair.
so in the end I want to have a perfect system of pairs, where orange starts a pair. like this:
orange=[212929;213223;213482;213740;214013;214790];
green= [212765;213301;213822;214090;214240;214426;214941];
if green(1)<orange(1)
green=green(2:end);
end
lenss =min(length(orange),length(green));
i = 1;
while i <= lenss
if abs(green(i)-orange(i)) <0
green(i) = [];
i=1;
continue;
else
i=1+1;
continue;
end
end
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Respuesta aceptada
Jan
el 14 de Mzo. de 2023
Editada: Jan
el 14 de Mzo. de 2023
orange = [212929;213223;213482;213740;214013;214790];
green = [212765;213301;213822;214090;214240;214426;214941];
[x, s] = sort([orange.', green.']);
index = strfind(s <= numel(orange), [true, false]);
ok_orange = x(index)
ok_green = x(index + 1)
The idea: sort all elements. If their sorting index is greater than the number of orange elements, they are green. So s <= numel(orange) is a logical vector, which is TRUE for orange and FALSE for green. Now find the neighboring [true, false] pairs.
5 comentarios
Jan
el 16 de Mzo. de 2023
@Dyuman Joshi: Since 1999. I used some other languages in the 15 years before.
Dyuman Joshi
el 16 de Mzo. de 2023
Editada: Dyuman Joshi
el 16 de Mzo. de 2023
Wow, just shy of my time on this planet!
What prompted you to try out MATLAB at that time and to stick with it for so long and continue using it? (If you don't mind me asking)
(I feel like this would be an interesting conversation to have with the MATLAB Answers community!)
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