How do I exact all the indexes with a certain value?
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I wrote a loop that scan through the channel that contains all the trigger markers and I set those with intensity >3 to 1, else =0. Now I have this variable (marker) that contains the trigger markers at the intensity of 1. I would like to get the indexes of marker with an intensity of 1. How should I do that? Thanks,
marker = zeros(size(Inpt_RZ2_chn002.dat));
for mi = 1:length(Inpt_RZ2_chn002.dat)-1
if Inpt_RZ2_chn002.dat(mi) > 3
marker(mi) = 1;
else
marker(mi) = 0;
end
end
plot(marker)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1384184/image.png)
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Respuesta aceptada
Matt J
el 15 de Mayo de 2023
Editada: Matt J
el 15 de Mayo de 2023
Don't use a loop. Just do,
marker = Inpt_RZ2_chn002.dat > 3;
The logical vector marker already functions as an index vector, e.g.,
greaterThanThree = Inpt_RZ2_chn002.dat(marker)
3 comentarios
Matt J
el 15 de Mayo de 2023
Editada: Matt J
el 15 de Mayo de 2023
How do I get the indexes of all the ones into a new variable with only all the indexes of ones.
Why are the indices in logical form not enough?
x=(1:5)*10
marker=(x>30)
x(marker)
If you really do need numeric indices, use find()
find(marker)
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