Subtracting vector elements, with an if condition?

Hey guys,

I need to subtract every element in my array with the element next to it and before it, then if the result of the subtraction is 0 on either subtraction, I need a new array where the elements which weren't 0 are keep their original values, but the elements which were 0 stay 0. Is this possible?

a=[1 2 3 4 5 6 7 7 7 7 7 8 9 10 11 12 13];

b=[1 2 3 4 5 6 0 0 0 0 0 8 9 10 11 12 13];

Thanks in advance!

Answer 1

[Stephen23]

a = [1 2 3 4 5 6 7 7 7 7 7 8 9 10 11 12 13];
b = a;
d = diff(a)==0;
b([false,d] | [d,false]) = 0

[Sanshu Bhutiani]

This works really well! Thank you!

Answer 2

[Walter Roberson]

b = a;
mask = b(1:end-1) = b(2:end);
b([false,mask]|[mask|false]) = 0;

Answer 3

[Sanshu Bhutiani]

Thanks everybody for the answers, it's really appreciated :).