[R] "pairs" with same xlim and ylim scale

[Dejian Zhao]

When "pairs" draws plots, "lower.panel" invokes "f.xy". Maybe there is 
something in "f.xy" incompatible with "pairs". You can read the code of 
"pairs" to see what happens.

"pairs" has two methods, as you can see in the help message (?pairs). 
According to your code, pairs is supposed to invoke "Default S3 method".
 > methods(pairs)
[1] pairs.default  pairs.formula*
    Non-visible functions are asterisked
Therefore, you should check the code of the function "pairs.default" to 
see how error occurs. Just type "pairs.default" at the R command prompt 
and enter, you can get the source code of "pairs.default".



On 2010-9-2 15:15, Shi, Tao wrote:
> Hi Dejian,
>
> You're right on this!  Do you know how to pass those two argument into
> lower.panel?  Thanks!
>
> ...Tao
>
>
> ________________________________
> From: Dejian Zhao<zhaodj at ioz.ac.cn>
> To:r-help at r-project.org
> Sent: Tue, August 31, 2010 6:10:16 PM
> Subject: Re: [R] "pairs" with same xlim and ylim scale
>
> I think you have successfully passed the "xlim" and "ylim" into the
> function pairs1. Compare the two graphs produced by the codes you
> provided, you can find the xlim and ylim in the second graph have been
> reset to the assigned value. It seems that the program halted in
> producing the second plot after adding xlim and ylim. According to the
> error message, the two added parameters were not used in lower.panel, or
> the customized function f.xy.
>
> On 2010-9-1 2:26, Shi, Tao wrote:
>    
>> Hi list,
>>
>> I have a function which basically is a wrapper of pairs with some useful panel
>> functions.  However, I'm having trouble to pass the "xlim" and "ylim" into the
>> function so the x and y axes are in the same scale and 45 degree lines are
>> exactly diagonal.   I've looked at some old posts, they didn't help much.  I
>>      
> [[elided Yahoo spam]]
>    
>> Thanks!
>>
>> ...Tao
>>
>>
>> pairs1<- function(x, ...) {
>>       f.xy<- function(x, y, ...) {
>>               points(x, y, ...)
>>               abline(0, 1, col = 2)
>>       }
>>
>>       panel.cor<- function(x, y, digits=2, prefix="", cex.cor) {
>>            usr<- par("usr"); on.exit(par(usr))
>>            par(usr = c(0, 1, 0, 1))
>>            r<- abs(cor(x, y, method="p", use="pairwise.complete.obs"))
>>            txt<- format(c(r, 0.123456789), digits=digits)[1]
>>            txt<- paste(prefix, txt, sep="")
>>            if(missing(cex.cor)) cex<- 0.8/strwidth(txt)
>>            text(0.5, 0.5, txt, cex = cex * r)
>>        }
>>
>>        panel.hist<- function(x, ...) {
>>            usr<- par("usr"); on.exit(par(usr))
>>            par(usr = c(usr[1:2], 0, 1.5) )
>>            h<- hist(x, plot = FALSE)
>>            breaks<- h$breaks; nB<- length(breaks)
>>            y<- h$counts; y<- y/max(y)
>>            rect(breaks[-nB], 0, breaks[-1], y, col="cyan", ...)
>>        }
>>
>>       pairs(x, lower.panel=f.xy, upper.panel=panel.cor, diag.panel=panel.hist,
>> ...)
>> }
>>
>>
>>      
>>> x<- rnorm(100, sd=0.2)
>>> x<- cbind(x=x-0.1, y=x+0.1)
>>> pairs1(x)
>>> pairs1(x, xlim=c(-1,1), ylim=c(-1,1))
>>>
>>>        
>> Error in lower.panel(...) :
>>     unused argument(s) (xlim = c(-1, 1), ylim = c(-1, 1))
>>
>>
>>
>>      [[alternative HTML version deleted]]
>>
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>> and provide commented, minimal, self-contained, reproducible code.
>>
>>      
> ______________________________________________
> R-help at r-project.org  mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
> ______________________________________________
> R-help at r-project.org  mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>