traverse the list of array elements

i've code the following for traversing

 function traverse
  clc;
  a=[ 1 2 2 3 3 4 4 4 4]
  for i=1:length(a)
    if(a(i)==a(i+1))
        fprintf('\nmatch\n %d and %d',a(i),a(i+1));
    else
        fprintf('\nnot a match\n');
    end
end

but the following error occurs

      Attempted to access a(10); index out of bounds because numel(a)=9.

tell me the way to sort it out...

Answer 1

[Azzi Abdelmalek]

Use

for i=1:length(a)-1

[pammy]

thank u