[R] detecting measurement of specific id in column in R

[Rui Barradas]

Hello,

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Hope this helps,

Rui Barradas

Às 09:33 de 22/11/2018, Romy Rehschuh via R-help escreveu:
> Dear all,
> 
> I hope this is the right way to ask questions.
> I have a problem with R regarding the detection of the measurement of a
> specific sample_id (see example file attached). I have to substract the
> "IN" values (means the air which goes into the chambers) from the values of
> "d13C", "ppm_CO2" and "ppm_13CO2" for every single chamber (=sample ID).
> The "IN" values have to be the ones which were measured* before *the
> measurements of the single chambers in time. I measured "IN" once and then
> up to 10 chambers in a row to safe time, then "IN" again, but it can change.
> Therefore, searching for the closest "IN" does not work.
> 
> Do you have any suggestions? Would it be possible to write a loop for this?
> I would really much appreciate your help!
> 
> Best, Vicci
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