[R] Plotting a simple subset

[Gabor Grothendieck]

To be fair none of Introduction to R, ?plot nor the reference card
really cover this without substantial digging.  

# test data
x <- 1:10
y <- x*x

plot(x[x > 5], y[x > 5])

# or 

plot(y ~ x, subset = x > 5)

# We can have combine conditions like this: 

plot(y ~ x, subset = x > 5 & y < 50)

# also if your intention was really set the plot limits rather than
# condition on the data then you can use xlim= and ylim=, e.g.

plot(y ~ x, xlim = c(5, max(x)))


Read over all of these: ?plot, ?plot.formula, ?plot.default, ?"&", ?">",
?c, ?max noting that plot dispatches plot.formula if you specify a formula
in plot and that subset= is an argument to the latter.


On 7/8/05, Berton Gunter <gunter.berton at gene.com> wrote:
> Please first read "An Introduction to R" (one of the pdf manuals that ships
> with R) before posting these sorts of questions, as it is written
> specifically to help you get started (I think fairly clearly).
> 
> Other (links to) learning resources may be found on the CRAN website. Please
> take advantage of them. One that you may find particularly helpful is:
> 
> Newbies (and others!) may find useful the R Reference Card made available by
> Tom Short and Rpad at http://www.rpad.org/Rpad/Rpad-refcard.pdf  or through
> the "Contributed" link on CRAN (where some other reference cards are also
> linked). It categorizes and organizes a bunch of R's basic, most used
> functions so that they can be easily found. For example, paste() is under
> the "Strings" heading and expand.grid() is under "Data Creation." For
> newbies struggling to find the right R function as well as veterans who
> can't quite remember the function name, it's very handy.
> 
> Yes, the initial learning curve is steep. However, if you do any serious
> data analysis and/or plotting, I promise that you will find it well worth
> your while.
> 
> -- Bert Gunter
> Genentech Non-Clinical Statistics
> South San Francisco, CA
> 
> "The business of the statistician is to catalyze the scientific learning
> process."  - George E. P. Box
> 
> 
> 
> > -----Original Message-----
> > From: r-help-bounces at stat.math.ethz.ch
> > [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Michael Hopkins
> > Sent: Friday, July 08, 2005 8:50 AM
> > To: r-help at stat.math.ethz.ch
> > Subject: [R] Plotting a simple subset
> >
> >
> >
> > Hi all
> >
> > Just converting from Stata to R and struggling a little to
> > come to terms
> > with the new philosophy/command line.
> >
> > E.g. I want to plot x against y if x < 5
> >
> > In Stata: graph x y, if( x < 5 )
> >
> > How do I do this in R?  Have tried most of the obvious options without
> > success.
> >
> > Can I have multiple subsets? I.e. In Stata: if( x < 5 && y > 3 )
> >
> > TIA
> >
> > Michael
> >
> >
> > _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
> > _/_/_/_/_/_/_/
> >
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> >      _/    _/   _/   _/
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> >
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> > ______________________________________________
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> >
> 
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