How can I discretize data by their sign?
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I would like to discretize data by their sign and return the index of 'alternating sign'.
For example if I have a vector:
A = [-2,-1,5,-10,7,3,-9,-12,11];
Their signs are like:
s = sign(A)
[-1,-1,1,-1,1,1,-1,-1,1]
I would like to return:
[1,1,2,3,4,4,5,5,6]
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Accepted Answer
Stephen23
on 20 Sep 2022
A = [-2,-1,5,-10,7,3,-9,-12,11];
B = sign(A);
C = cumsum(logical([1,diff(B)]))
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More Answers (1)
Chunru
on 20 Sep 2022
A = [-2,-1,5,-10,7,3,-9,-12,11];
s = sign(A)
s1 = [1 diff(s)~=0]
y = cumsum(s1)
% [1,1,2,3,4,4,5,5,6]
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