No attached file. R-help is very fussy about what kind of file it will accept, A txt or pdf is the best bet. On the other hand it usually is best to include any code and sample data in the actual e-mail. Use the function dput() as the best way to supply data. On Thursday, November 22, 2018, 11:15:00 a.m. EST, Romy Rehschuh via R-help <r-help@r-project.org> wrote: 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 ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.