[R] help on ploting various lines

[Marc Schwartz (via MN)]

On Wed, 2006-06-21 at 11:55 -0500, Marc Schwartz (via MN) wrote:
> On Wed, 2006-06-21 at 12:22 -0400, Baoqiang Cao wrote:
> > Dear All,
> > 
> > I tried to plot a variety of lines(curves) on same figure. What I did
> > is,
> > plot(x=x1,y=y1)
> > lines(x=x2,y=y2)
> > lines(x=x3,y=y3)
> > ...
> > 
> > In my data, the maximum of y1 is much smaller than those maximums of
> > other y vectors. So, in the figure I got, there are some curves which
> > are not complete, I mean, they were cut off at the maximum of y1 at
> > the y axis. Could anybody point out some right commands I need use?
> > Thanks!
> > 
> > Best,
> >  Cao
> 
> You will want to use the 'xlim' and 'ylim' arguments in plot() to set
> the initial axis ranges for the scatter plot based upon the ranges of
> the combined x* or y* vectors. That way, the plot region ranges are set
> to include all of your values.
> 
> x.range <- range(x1, x2, x3)
> y.range <- range(y1, y2, y3)
> 
> plot(x1, y1, xlim = x.range, ylim = y.range)
> lines(x2, y2)
> lines(x3, y3)
> 
> See ?plot.default for more information.

One other note, which is to review:

  ?matplot

which also has help for matpoints() and matlines(), which will do the
common axis range adjustments for you. 

This will be helpful if you are going to be plotting a larger number of
points/lines in a single graphic.

HTH,

Marc