Hello I have a big dataset where i have pulled out some periods of time acording to a herd-number (see below): CHR_NR DATO_TEST SALMO_INDEX didiffdatoperiode 11377 2003-06-20 7.9 29 11377 2003-09-01 4.3 59 11377 2004-02-24 5.1 78 where the variable 'diffdatoperiode' is the period in days and represents the x-value and 'CHR_NR' is the herd number. These periods corresponds to a sum of periods in the variable 'diffdato1', and each of these periods have an y-value represented by the variable 'SALMO_INDEX': CHR_NR DATO_TEST SALMO_INDEX diffdato diffdato1 11377 2003-05-22 17.0 14 15 11377 2003-06-06 18.8 15 14 11377 2003-07-04 20.1 14 17 11377 2003-07-21 32.9 17 14 11377 2003-08-04 19.9 14 14 11377 2003-08-18 10.5 14 14 11377 2003-12-08 20.5 27 29 11377 2004-01-06 28.6 29 8 11377 2004-01-14 28.6 8 8 11377 2004-01-22 19.0 8 7 11377 2004-01-29 19.0 7 7 11377 2004-02-05 14.4 7 7 11377 2004-02-12 14.4 7 12 So, 29 = 15 +14, 59 = 17 + 14 + 14 +14 and 78 = 29 + 8 + 8+ +7 +7 +7 + 12. So i need a plot where the y-axis is the 'SALMO_INDEX' corresponding to the values in 'diffdato1', and the x-axis is the 'diffdato' and 'difdato1' at the same time. So the periods in 'diffdato1' is kind of like "sub"-x values to the periods in 'diffdato'. So the plot should be created like if the three values 29, 59 and 78 each had a x-axis, but together in one x-axis. It's a little bit hard to expalin. Hope you can help me -- View this message in context: http://www.nabble.com/Making-plot-with-%22sub%22-X-values-tp21996730p21996730.html Sent from the R help mailing list archive at Nabble.com.