[R] asp and ylim

[Gabor Grothendieck]

Try lattice:

library(lattice)
xyplot(y ~ x, ylim = c(0.5, 0.7), aspect = "iso")


On Sun, Jul 20, 2008 at 5:58 PM, David Epstein
<David.Epstein at warwick.ac.uk> wrote:
>
> On 20 Jul, 2008, at 22:00, Rolf Turner wrote:
>>
>>        I just tried
>>
>>         > set.seed(42)
>>         > x <- runif(10)
>>         > y <- runif(10)
>>         > plot(x,y,ylim=c(-1,2),asp=1)
>>
>>        and it seemed to give results as expected/desired.
>>
>>                cheers,
>>
>>                        Rolf Turner
>>
>
>
> I tried plot(x,y,ylim=c(0.5,0.7),asp=1) on your data above and it failed to
> restrict the y-coordinates to between 0.5 and 0.7.  In fact, the behaviour
> is independent of whether I insert the ylim=c(0.5,0.7) argument or omit it.
> So that's definitely not what I want to happen. Nor does the behaviour
> accord with the advertised behaviour seen from help(plot.window). I want the
> smallest y-coord seen on the plot to be .5 and the largest to be .7. I want
> points outside that range not to be displayed. This seems to be what
> help(plot.window) promises.
>
> When I added to your plot command the argument xlim=c(0,1), then that xlim
> instruction was also ignored. It seems that there is an unstated set of
> rules for how the plot should react to xlim and ylim settings when asp is
> set. I wonder if anyone knows what they are. I suppose one could always read
> the source. For example, one might guess from these examples discussed so
> far that asp=1 forces the forces the window to be square, but that is not
> the case. And the command plot(x,y,xlim=c(-6,-1),ylim=c(-1,2),asp=1) on your
> data suddenly decides that it ought to behave the way I think is
> reasonable---namely the plot is empty---in contrast to all the other
> examples where it has insisted on displaying ALL the points (x[i],y[i]),
> ignoring the values of xlim and ylim.
>
> It's fine by me to have xlim and ylim perform idiosyncratically. But can I
> achieve the degree of control I would like, perhaps using a different
> technique, or different tags?
>
> David
>
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