[R] how to create a simple loop ?

[Edouard Tallent]

I have a 5-row matrix called “data”. There are headers.
it look like this :
Row 1   Row2    Row3    Row4    Row5
Line1     …            …            …            …
Line2     …            …            …            …
Line3     …            …            …            …
…
Line 1838             …            …            …            …
 I want to calculate several simple arithmetic means for Row5, that is from 
Line173 to Line193, from Line434 to Line455, from Line699 to Line724, from 
Line955 to Line977
 A simple way is to individually compute these means. The first one (Line173 to 
Line193) is then obtained by :
>mean(data[173:193,5], na.rm = TRUE)
That’s right ! But, I aim to automate this calculation by creating a loop.
I tried many things, but I have been unsuccessful at using the ‘for’ loop 
function.
Please, don’t explain things too hard as it is often the case that people 
wants to help but gets into too much sophistication.
Someone can write that little code for this example ? Or suggest functions ?
Thanks for your help.
Cheers,
Édouard.

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