R help - Nov 2007 - biplot

Hi,

I am wondering how to draw biplot with the same scales on both plots?
For example, if the two plots have much different scales, generally
the two x-y's are scaled so that the two plots are sitting in the
center automatically. How to disable this?

Thanks


-- 
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.

"Did you always know?"
"No, I did not. But I believed..."
---Matrix III

On Mon, 2007-11-19 at 13:51 -0500, Weiwei Shi wrote:
> Hi,
> 
> I am wondering how to draw biplot with the same scales on both plots?
> For example, if the two plots have much different scales, generally
> the two x-y's are scaled so that the two plots are sitting in the
> center automatically. How to disable this?
> 
> Thanks
Hi WeiWei

To solve your problem you must use the options xlim, ylim in your biplot


par(mfrow=c(2,1))
biplot(...,xlim=c(minimun,maximun),ylim=c(minimun,maximun),...)
biplot(...,xlim=c(minimun,maximun),ylim=c(minimun,maximun),...)

-- 
Bernardo Rangel Tura, M.D,MPH,Ph.D
National Institute of Cardiology
Brazil

Also check the asp= parameter in plot.default and plot.window; this sets
the aspect ratio so that 1 unit in x is the same physicla length as 1
unit in y. I don;t know whether it is respeced by your particular
biplot, though.
>>> Bernardo Rangel Tura <tura at centroin.com.br> 20/11/2007
10:51:12
>>>
On Mon, 2007-11-19 at 13:51 -0500, Weiwei Shi wrote:
> Hi,
> 
> I am wondering how to draw biplot with the same scales on both
plots?
> For example, if the two plots have much different scales, generally
> the two x-y's are scaled so that the two plots are sitting in the
> center automatically. How to disable this?
> 
> Thanks
Hi WeiWei

To solve your problem you must use the options xlim, ylim in your
biplot


par(mfrow=c(2,1))
biplot(...,xlim=c(minimun,maximun),ylim=c(minimun,maximun),...)
biplot(...,xlim=c(minimun,maximun),ylim=c(minimun,maximun),...)

-- 
Bernardo Rangel Tura, M.D,MPH,Ph.D
National Institute of Cardiology
Brazil

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