Breaking and spliting vector into groups and averaging
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Hi,
I have a long one-dimensional time vector that I want to split in chunks and average each chunk. I have another logical vector (same length) of 0s and 1s that changes the sign to signal each chunk transition. How could I easily use the information on the logical vector to select each chunk of the time vector?
Thanks!
timevec = [0 2 3 4 5 0 9 3 4];
chunk = [0 0 0 1 1 1 1 0 0];
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Adam Danz
il 10 Mar 2021
Modificato: Adam Danz
il 10 Mar 2021
timevec = [0 2 3 4 5 0 9 3 4];
chunk = [0 0 0 1 1 1 1 0 0];
g = cumsum([1, diff(chunk)]~=0); % assuming 'chunk' is a row vector
groupMeans = splitapply(@mean, timevec, g)
5 Commenti
Adam Danz
il 11 Mar 2021
To define groups by the chunk vector resetting to 0,
chunk = [0 0 0 1 1 1 1 0 0 0 0 1]
g = cumsum(diff([1,chunk])==-1)
For the second question, do you mean this?
timevec = [0 2 3 4 5 0 9 3 4];
chunk = [0 0 0 1 1 1 1 0 0];
cond = logical([1 1 1 1 0 0 1 1 1]);
X = timevec(cond);
Y = chunk(cond);
g = cumsum([1, diff(Y)]~=0);
groupMeans = splitapply(@mean, X, g)
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