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make adjacent array element the same as current element

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Darren Lim
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

Accepted Answer

Alan Moses
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

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