[R] R plot

[(Ted Harding)]

On 17-Oct-08 09:01:08, Benoit Boulinguiez wrote:
> Hi,
> Personally I always use xlim and ylim with the plot or points
> function like that:
> 
> plot( X,Y,pch=16,col=2,cex.axis=1.5,cex.lab=1.5,
>       xlim=c(0,1.05*max(X)),ylim=c(0,1.05*max(Y))
>       )
> 
> Regards/Cordialement
> Benoit Boulinguiez 

I think (from his original post) that Haoda already knows about
the use of xlim and ylim. What he finds annoying is "keeping track"
of what they should be!

Here, I'm afraid, I am inclined to agree with him. For example,
if you want to plot say 10 time series, with different time-ranges
and different value-ranges, all on the one graph, and they have
to be obtained separately (even by reading in from 10 different
data files), then the only way I have found is to wait until all
the objects are available, then compute the min and max of the
x-range and the y-range of each, and finally base xlim on the
min of the min x-ranges and the max of the max x-ranges (and
similarly for ylim). Of course you could alternatively do this
cumulatively as you go along, and even build the process into
a function. But it is a lot of "admin" along the way, and it can
get complicated.

This sort of thing has caused me a lot of extra work on many
occasions, which would have been unnecessary if plots could
"re-size" themselves when asked to go outside existing ranges.
I grin and bear it, because that's how things work; but I have
to admit that I don't like it!

Best wishes to all,
Ted.


> -----Message d'origine-----
> De : r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
> De
> la part de Wacek Kusnierczyk
> Envoyé : vendredi 17 octobre 2008 10:47
> À : Haoda Fu
> Cc : R help
> Objet : Re: [R] R plot
> 
> Haoda Fu wrote:
>> All -
>>
>>
>> When I plot something like
>>
>> a<-rnorm(5)
>> b<-rnorm(5)
>> plot(a,b,col = "red")
>> points(10,-10)
>>
>> The last point is missing because it is out of range of the first 
>> plot.
>>
>> I just try to switch from Matlab to R. In Matlab, it always can 
>> automatic adjust the xlim and ylim for such case.
>>
>> Is it possible auto adjust in R? Otherwise keep tracking xlim and ylim
>> is really annoying.
>>
>>   
> 
> if you know the range in advance, you can specify it using the xlim and
> ylim
> parameters to plot.  you can also use them in points (it doesn't cause
> an
> error), but it does not seem to have the desired effect of reshaping
> the
> plot.
> 
> it's perhaps a pity it works this way, but you have to get used to it. 
> or drop r if you find matlab better.
> 
> 
> vQ
> 
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> ______________________________________________
> R-help at r-project.org mailing list
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> PLEASE do read the posting guide
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E-Mail: (Ted Harding) <Ted.Harding at manchester.ac.uk>
Fax-to-email: +44 (0)870 094 0861
Date: 17-Oct-08                                       Time: 10:31:03
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