For Loop Index Problems

[josgau33]

Hello,

I am having a simple problem with the for loop and its index. Basically,
here is a simple program to illustrate the problem I am having.

i=1;
a=[1 2 3 8 8 8 3 2 1];

for i=1:length(a)
i
  while a(1,i)==8
  i=i+1;
  i
  end
i
i=i+1;
i
end

This gives the output shown below:
i =  1
i =  1
i =  2
i =  2
i =  2
i =  3
i =  3
i =  3
i =  4
i =  4
i =  5
i =  6
i =  7
i =  7
i =  8
i =  5
i =  6
i =  7
i =  7
i =  8
i =  6
i =  7
i =  7
i =  8
i =  7
i =  7
i =  8
i =  8
i =  8
i =  9
i =  9
i =  9
i =  10

So from here, we can see that... When a=8, the while loop is entered, and i
equals 7 when it leaves the while loop... We then see that i=7 right outside
of the while loop, and that after i=i+1, i now equals 8. But then, the next
iteration of the for loop sets i equal to 5, which was the next iteration
originally (before the while loop was entered).

My question is... Is there any way to avoid the resetting of the index? Is
there some sort of for loop where the user is allowed to control the index,
and not the computer. If not, can anybody show me modifications to the code
that would solve this problem? I cannot seem to figure it out on my own.
Suggestions would be helpful too. Thank you,

Joseph Gauthier
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