Hi again,
I was thinking that the interval would stop when there was a NA, ignore
subsequent NAs and only start a new interval when there was a new value. So
in the example below, the interval would stop at row 320, and a new interval
started at row 334.
> head (D, 20)
Salt time
319 35.63190 2004-07-26
320 35.66033 2004-07-27
321 NA 2004-07-28
322 NA 2004-07-29
323 NA 2004-07-30
324 NA 2004-07-31
325 NA 2004-08-01
326 NA 2004-08-02
327 NA 2004-08-03
328 NA 2004-08-04
329 NA 2004-08-05
330 NA 2004-08-06
331 NA 2004-08-07
332 NA 2004-08-08
333 NA 2004-08-09
334 35.57781 2004-08-10
335 35.59829 2004-08-11
Many thanks, Helene
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