R help - Jul 2005 - Plot zooming i.e. changing ylim according to xlim

Dear R-gurus,

I would like to zoom in a plot, e.g. I select a region on the x-axis and 
then I would like the ranges on the y-axis to change accordingly.

Is it possible to do this with existing functions, or do I have to 
invent some data selection before plotting?

See below a short example, where I select ylim with trial and error, 
which I want to avoid.

Cheers, Henrik Andersson
--------------------------------------------------------------------
## Example -- in reality more numbers, no function
x <- seq(0,20)
y <- exp(-x)

plot(y~x,type='l')

## Zoom in the end, to see what's happenning

plot(y~x,type='l',xlim=c(19,20))

## Try other ylim

plot(y~x,type='l',xlim=c(19,20),ylim=c(0,1))

## Not enough

plot(y~x,type='l',xlim=c(19,20),ylim=c(0,1E-8))

## Better
---------------------------------------------
Henrik Andersson
Netherlands Institute of Ecology -
Centre for Estuarine and Marine Ecology
P.O. Box 140
4400 AC Yerseke
Phone: +31 113 577473
h.andersson at nioo.knaw.nl
http://www.nioo.knaw.nl/ppages/handersson

Search the archives for zoom and you will find plenty of answers on this
question.

RSiteSearch("zoom")

Tom
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch]On Behalf Of Henrik Andersson
> Sent: Tuesday, 26 July 2005 4:16 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Plot zooming i.e. changing ylim according to xlim
> 
> 
> Dear R-gurus,
> 
> I would like to zoom in a plot, e.g. I select a region on the 
> x-axis and 
> then I would like the ranges on the y-axis to change accordingly.
> 
> Is it possible to do this with existing functions, or do I have to 
> invent some data selection before plotting?
> 
> See below a short example, where I select ylim with trial and error, 
> which I want to avoid.
> 
> Cheers, Henrik Andersson
> --------------------------------------------------------------------
> ## Example -- in reality more numbers, no function
> x <- seq(0,20)
> y <- exp(-x)
> 
> plot(y~x,type='l')
> 
> ## Zoom in the end, to see what's happenning
> 
> plot(y~x,type='l',xlim=c(19,20))
> 
> ## Try other ylim
> 
> plot(y~x,type='l',xlim=c(19,20),ylim=c(0,1))
> 
> ## Not enough
> 
> plot(y~x,type='l',xlim=c(19,20),ylim=c(0,1E-8))
> 
> ## Better
> ---------------------------------------------
> Henrik Andersson
> Netherlands Institute of Ecology -
> Centre for Estuarine and Marine Ecology
> P.O. Box 140
> 4400 AC Yerseke
> Phone: +31 113 577473
> h.andersson at nioo.knaw.nl
> http://www.nioo.knaw.nl/ppages/handersson
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! 
http://www.R-project.org/posting-guide.html

>>Dear R-gurus,
>>
>>I would like to zoom in a plot, e.g. I select a region on the 
>>x-axis and 
>>then I would like the ranges on the y-axis to change accordingly.
>>
>>Is it possible to do this with existing functions, or do I have to 
>>invent some data selection before plotting?
>>
>>See below a short example, where I select ylim with trial and error, 
>>which I want to avoid.
Mulholland, Tom wrote:
 > Search the archives for zoom and you will find plenty of answers on 
this question.
 >
 > RSiteSearch("zoom")
 >
 > Tom

I looked there already, but I could only find interactive zooming, which 
  is also nice, but I want a non-interactive function that automagically 
changes the y-axis to fit only the data specified in the part of the 
x-axis, or the other way around. I guess that was not very clear from my 
first post.

- Henrik

Hi

Not avoiding trial and error but you can do it interactively by point 
clicking on a plot.
> replot
function (x, y, type = "l") 
{
    body <- locator(2)
    plot(x, y, xlim = range(body$x), ylim = range(body$y), type = 
type)
}
>
HTH

Best regards
Petr Pikal



On 26 Jul 2005 at 10:16, Henrik Andersson wrote:
> Dear R-gurus,
> 
> I would like to zoom in a plot, e.g. I select a region on the x-axis
> and then I would like the ranges on the y-axis to change accordingly.
> 
> Is it possible to do this with existing functions, or do I have to
> invent some data selection before plotting?
> 
> See below a short example, where I select ylim with trial and error,
> which I want to avoid.
> 
> Cheers, Henrik Andersson
> --------------------------------------------------------------------
> ## Example -- in reality more numbers, no function x <- seq(0,20) y
<-
> exp(-x)
> 
> plot(y~x,type='l')
> 
> ## Zoom in the end, to see what's happenning
> 
> plot(y~x,type='l',xlim=c(19,20))
> 
> ## Try other ylim
> 
> plot(y~x,type='l',xlim=c(19,20),ylim=c(0,1))
> 
> ## Not enough
> 
> plot(y~x,type='l',xlim=c(19,20),ylim=c(0,1E-8))
> 
> ## Better
> ---------------------------------------------
> Henrik Andersson
> Netherlands Institute of Ecology -
> Centre for Estuarine and Marine Ecology
> P.O. Box 140
> 4400 AC Yerseke
> Phone: +31 113 577473
> h.andersson at nioo.knaw.nl
> http://www.nioo.knaw.nl/ppages/handersson
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html
Petr Pikal
petr.pikal at precheza.cz

Well
 here is the better shot

x <- seq(0,20)
y <- exp(-x)
plot(x,y, type="l")
intervalx<-c(19,20)
intervaly<-y[x%in%intervalx]
plot(x,y, xlim=range(intervalx), ylim=range(intervaly), type="l")
 
HTH

Petr


On 26 Jul 2005 at 11:13, Henrik Andersson wrote:
> >>Dear R-gurus,
> >>
> >>I would like to zoom in a plot, e.g. I select a region on the 
> >>x-axis and 
> >>then I would like the ranges on the y-axis to change accordingly.
> >>
> >>Is it possible to do this with existing functions, or do I have to
> >>invent some data selection before plotting?
> >>
> >>See below a short example, where I select ylim with trial and
error,
> >> which I want to avoid.
> Mulholland, Tom wrote:
>  > Search the archives for zoom and you will find plenty of answers on
>  
> this question.
>  >
>  > RSiteSearch("zoom")
>  >
>  > Tom
> 
> I looked there already, but I could only find interactive zooming,
> which 
>   is also nice, but I want a non-interactive function that
>   automagically 
> changes the y-axis to fit only the data specified in the part of the
> x-axis, or the other way around. I guess that was not very clear from
> my first post.
> 
> - Henrik
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html
Petr Pikal
petr.pikal at precheza.cz

On 7/26/05, Henrik Andersson <h.andersson at nioo.knaw.nl>
wrote:
> Dear R-gurus,
> 
> I would like to zoom in a plot, e.g. I select a region on the x-axis and
> then I would like the ranges on the y-axis to change accordingly.
> 
> Is it possible to do this with existing functions, or do I have to
> invent some data selection before plotting?
> 
> See below a short example, where I select ylim with trial and error,
> which I want to avoid.
> 
> Cheers, Henrik Andersson
> --------------------------------------------------------------------
> ## Example -- in reality more numbers, no function
> x <- seq(0,20)
> y <- exp(-x)
> 
> plot(y~x,type='l')
> 
> ## Zoom in the end, to see what's happenning
> 
> plot(y~x,type='l',xlim=c(19,20))
I tend to use constructs like 

plot(y~x,type='l', subset = x > 15)

(18 is not very interesting).

Deepayan