[R] how to ajust y-axis values in plot() ?

[S Ellison]

>   I want to plot( 11:20 ) in a plot.
>  if i just type the code above, the y value  will be from 11 to 20, now i want the
> value from a given range like  0 to 40, how can i do it?
See the ylim= argument to plot.default; eg
plot(x, y, ylim=c(0,40))

Also look at ?par and note that plot() and other things often take many of par's arguments.


> Actually, the qustion is founded when i already plot a plot like plot(11:20) , but
> when i abline(h=40), i found it will go out of the plot even after i used
> abline(h=40,xpd=T).
Um, yes. A horizontal line at y=40 would not even be inside the plot window if the plot region is scaled to c(11,20). Where did you expect/want the line to appear? 

S


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