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n4644986
2012 Oct 22
2
Assigning values to several consecutives rows in a sequence while leaving some empty
...the same
value) while leaving some of the rows empty (when a certain condition is not
fulfilled).
My data are locations (xy coordinates), the date/time at which they were
measured, and the time span between measures. Somehow simplified, they look
like this:
<http://r.789695.n4.nabble.com/file/n4646956/image1.png>
I'd like to assign a value to every sequence of locations that are measured
within a time span of 4 hours, and make my data look like this:
<http://r.789695.n4.nabble.com/file/n4646956/image2.png>
I've tried several algorithms with a loop "for" plus "...