unique function but with repeated groups

I have= [1 1 1 5 5 5 1 1]

I want first indices of each repeat values: [1 4 7]

i.e., the first group of repeated 1's start at index 1, the second group of repeated 5's start at index 4 and the third group of repeated 1s start at index 7

I am trying unique function, but it misses out the last group of 1s.

[~,ic,~]=unique([1 1 1 5 5 5 1 1], 'stable')

gives me [1 4] and not [1 4 7]

Answer 1

[Haneya Qureshi]

Figured it out!

G= [1 1 1 5 5 5 1 1]

temp = [0, diff(G(:)')==0,0];

index = strfind(temp,[1 0]);