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Find places before or after zeros in vector

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Christian S.
Christian S. on 26 Aug 2021
Commented: Christian S. on 27 Aug 2021
Hi MATLAB-Community,
I'm searching for an elegant way to mark the places before and after zeros in a Vector.
e.g.:
a = 0 0 0 1 1 1 0 0 1 1 1 0 1 1 1 0 1 1 0
before = 0 0 0 1 0 0 0 0 1 0 0 0 1 0 0 0 1 0 0
after = 0 0 0 0 0 1 0 0 0 0 1 0 0 0 1 0 0 1 0
Has anybody an Idea that can help me with that Problem?
Thanks in advance!
Cheers
Christian

Accepted Answer

Ive J
Ive J on 26 Aug 2021
Edited: Ive J on 26 Aug 2021
a = [0 0 0 1 1 1 0 0 1 1 1 0 1 1 1 0 1 1 0];
before = [0 0 0 1 0 0 0 0 1 0 0 0 1 0 0 0 1 0 0];
after = [0 0 0 0 0 1 0 0 0 0 1 0 0 0 1 0 0 1 0];
da = [diff(a), 0];
bcheck = circshift(da > 0, 1);
acheck = da < 0;
all(bcheck == before)
ans = logical
1
all(acheck == after)
ans = logical
1
This may not cover leading and trailing zeros, though before and after zeros may not make sense in that case.

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