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Dear all, 
It would appear so: 
"Andy " <myfakeemailaddress@gmail.com> wrote in message <i43df8$ba6$1@fred.mathworks.com>... 
> You also have to be careful with a for loop since the total length may not be as long at the end (after removing spots) when it was when you initialized the loop. 
"Andy " <myfakeemailaddress@gmail.com> wrote in message <i43hvm$rc0$1@fred.mathworks.com>... 
"Sean " <sean.dewolski@nospamplease.umit.maine.edu> wrote in message <i43itl$r5n$1@fred.mathworks.com>... 
"Akim " <aaa@bbb.ccc> wrote in message <i43bor$n7h$1@fred.mathworks.com>... 
Sean, I see your point. Since the while loop recalculates length(x) on each loop iteration, you won't accidentally index outside the bounds of x. I would argue, however, that both of these loops are quite dangerous in that they present a silent error: it seems the intent is to eliminate every 100th element of x. But of course this is not what either loop does. 
Thanks all for your help. 
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