[R] Plot in cartesian plane

[Charles C. Berry]

On Wed, 18 Aug 2010, Pablo Cerdeira wrote:

> Hi all,
>
> I'm trying to plot this two curves in a single cartesian plane, but when I
> plot the first one, the plot appears with no negative "y" value. When I plot
> the second curve, it almost does not apear in the graph.
>
> I was trying the plot.window but with no success.
>
> Can someone help me with this?

The answer is in

 	?par

but it requires a bit of deduction.  Start with the description of yaxs, 
which refers to xaxs. Notice what the xaxs paragraph says about xlim. If 
you can figure out that there is also a ylim arg, then you are pretty much 
finished. Something like

 	plot( f, -10, 10, ylim=c(-100,100) )

will reveal both curves.

xlim and ylim also appear briefly in R-Intro ni Appendix A.

FWIW, one can use xlim and ylim to 'zoom in' on a section of a plot.

HTH,

Chuck

>
> If possible, I'd like to plot this curves in a perfect cartesian plane.
>
> f = function(x) {
>  x^2
> }
> f2 = function(x) {
>  -x^2
> }
>
> plot(f,-10,10)
> abline(h=0, v=0, col = "gray60")
> curve(f2,col="orange", add=T)
>
> Thanks in advanced!
>
>
> *pablo de camargo cerdeira*
> pablo.cerdeira at gmail.com | pablo at fgv.br
> Phone: +55-(21)-3799-6065
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Charles C. Berry                            (858) 534-2098
                                             Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	            UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901