search for: julian_day

...ue of the difference between the time of the stage measurement and the hour of the pressure measurement is less than or equal to 30 minutes, then subtract the pressure measurement from the stage measurement (and put it in a new column in the stage data frame)." if ( stage$julian_day = baro$julian_day & |stage$time - baro$hour| <= 30 ) then (stage$stage.cm - baro$pressure) Can you help me? Thanks, JL [[alternative HTML version deleted]]

I have a file that reads like this: Species,Year,Julian_day Alnus_glutinosa, 1873, 123 Sorbus_aucuparia, 1873, 122 ....(more species...) Alnus_glutinosa, 1874, 134 Sorbus_aucuparia, 1874, 143 ....(more species and years) Is there a way to plot this as julian day over years so that each species get a different color? Also is it possible to convert this data...