how to repeat a block of code with a for loop?

How do I repeat a block of code with a for loop? My code doesn't depend on the number of iterations (it isn't n^2 where n = [1 2 3 4]) instead,

I am trying to write:

loop(1) = 1;
for ii = 1:100
  loop(ii) = loop(ii)+1;
  _blah blah blah code_
end

[dpb]

Think we need more specific example of what blah... is and what it is that you're trying to repeat.

As your code snippet is written there's nothing that wouldn't work(+) but it's not clear that it's of much use, either...

(+) "Work" as in run without a compilation error. What the result would be compared to what would be wanted is something else again. Of course, one would normally preallocate loop here before the for construct as

loop=zeros(100,1);  % explicitly allocate array

or equivalently,

loop(100,1)=0;  % automagically allocates array