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
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