make adjacent array element the same as current element

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

Answer 1

[Alan Moses]

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

[Darren Lim]

Thanks Alan! Works perfectly and elegantly :)