Dear all,
I have some device measurements and the time stamps I get from it have the 
below format:

MyStruct$TimeStamps[1,]
> [1] 2011.000   10.000    6.000   16.000   23.000   30.539

I can convert them easily with ISOdate() to a number and do the calculations I 
need.

One of my problems is that I want to gather my measurements to piles of 
duration (let's say) 5 minutes.
Afterwards I will apply a function to these piles.
As the device is not super-precise please find below the time needed for one 
operation to complete (in seconds)
.....

1.10
1.90
1.34
1.23
1.56
1.22
1.34
....

as you understand I can not say that 5 minutes measurements are specific to X 
consecutive measurements but differ. How I can ask from R to do the summation 
and whenever there is a 5 minute data set to split it so to apply it into a 
function?

I would like to thank you in advance for your help

B.R
Alex

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