Find a block of ones in a vector

2011 9 12
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Hi,
I have a simple question but no matlab command for this :). I have a vector containing zeros and ones. I want to find every beginning of a block containing only of ones. For example: 000110011100. I want to get 4 and 8 as the indices indicating the beginning of a block with only ones.
Thank you for your efforts.

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Fangjun Jiang
Fangjun Jiang 2011-9-12

0 个投票

a=[0 0 0 1 1 0 0 1 1 1 0 0]
ind=find(diff(a)==1)+1
Not too fast. This won't work if a starts with 1. Use this instead
a=[1 1 0 0 0 1 1 0 0 1 1 1 0 0]
ind=find(diff([0 a])==1)

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fcarl
fcarl 2011-9-12
Great :) diff is exactly which i was searching for :)
Andrei Bobrov
Andrei Bobrov 2011-9-12
ind = strfind([0 a],[0 1])

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fcarl
fcarl 2011-9-12

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I recognized this ;) the function was helpfull :)

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