Thank you. The answers provides the right direction and a code was written accordingly.
One more request, if the label of axis X wants to be drawn from 5 to 1 (left to right) rather than 1 to 5, is it fine to change axis (4, at = NULL) ? If so, which value should be input ? Thanks again. Elaine code plot(1:5,axes=FALSE) axis(1) axis(4) box() On Wed, Aug 25, 2010 at 5:39 PM, Jim Lemon <j...@bitwrit.com.au> wrote: > On 08/25/2010 09:12 AM, elaine kuo wrote: > >> Dear List, >> >> I have a richness data distributing across 20 N to 20 S latitude. (120 >> E-140 >> E longitude). >> >> >> I would like to draw the richness in the north hemisphere and a regression >> line in the plot >> (x-axis: latitude, y-axis: richness in the north hemisphere). >> The above demand is done using plot. >> >> Then, south hemisphere richness and regression are required to be >> generated >> using >> the same y-axis above but an x-axis on the left side of the y-axis. >> (The higher latitude in the south hemisphere, the left it would move) >> >> Please kindly share how to design the south plot and regression line for >> richness. >> Also, please advise if any more info is in need. >> >> Hi Elaine, > Changing the position of the axes is easily done by changing the "side" and > "pos" arguments of the "axis" function. If you want to move the y-axis to > the right (or as you state it, the x axis to the left): > > # y axis on the left > plot(1:5,axes=FALSE) > axis(1) > axis(2) > # add a y axis one third of the way to the right > xylim<-par("usr") > axis(2,pos=xylim[1]+diff(xylim[1:2])/3) > # add another y axis two thirds of the way > axis(4,pos=xylim[2]-diff(xylim[1:2])/3) > # add one more on the right > axis(4) > > You can move the x axis up and down using the same tricks. > > Jim > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list 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.