Finding consecutive zeros in an array. Not able to solve using diff command

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Jaya
Jaya on 24 Oct 2021
Commented: Jaya on 24 Oct 2021
I have an array like below
a=[0 0 1 1 -1 0 0 0 1 1 1 -1 0 0 1 -1] %in my actual code, there are many elements
There is a -1 after every set of 1s like an end marker. I want to find the largest number of consecutive zeros present. Here it would be 3.
I used diff(a) but in this case even 1-1=0 along with 0-0=0. I also tried manipulating the array with some math operations and then using diff(a) but no use.
Any idea on how to do this?

Accepted Answer

Stephen
Stephen on 24 Oct 2021
a = [0,0,1,1,-1,0,0,0,1,1,1,-1,0,0,1,-1];
d = diff([false,a==0,false]);
b = find(d>0);
e = find(d<0);
m = max(e-b)
m = 3

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