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# make adjacent array element the same as current element

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Darren Lim on 27 Jan 2021
Commented: Darren Lim on 2 Feb 2021
Dear Community ,
I have an array : say [ 0 0 1 0 0 0 1 1 1 0 0 0 1 0 ]
If the array has 1 , i want to make it such that the neighbouring element (left and right ) will turn into 1 .
sample before [ 0 0 1 0 0 0 1 1 1 0 0 0 1 0 ]
sample after [ 0 1 1 1 0 1 1 1 1 1 0 1 1 1 ]
Is there any way to do this without a for loop ? any function that works like transformAdjArrayOnes()? Thanks in advance!
Darren
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### Accepted Answer

Alan Moses on 29 Jan 2021
You may refer to the piece of code below that uses the find function to achieve your goal without using a loop.
function y = transformAdjArrayOnes(a)
y = a; %copying the input array
loc = find(a==1); %finding locations of 1
y(loc+1) = 1; %making right adjacent element to 1
y(loc-1) = 1; %making left adjacent element to 1
end
You may call the above function with your sample array as follows:
>> a = [ 0 0 1 0 0 0 1 1 1 0 0 0 1 0 ]
a =
0 0 1 0 0 0 1 1 1 0 0 0 1 0
>> transformAdjArrayOnes(a)
ans =
0 1 1 1 0 1 1 1 1 1 0 1 1 1
##### 1 CommentShowHide None
Darren Lim on 2 Feb 2021
Thanks Alan! Works perfectly and elegantly :)

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