[R] identify with mfcol=c(1,2)

[Greg Snow]

I tried your code, first I removed the reference to the global
variable data$Line, then it works if I finish identifying by either
right clicking (I am in windows) and choosing stop, or using the stop
menu.  It does as you say if I press escape or use the stop sign
button (both stop the whole evaluation rather than just the
identifying).

On Tue, Apr 3, 2012 at 8:52 AM, John Sorkin <jsorkin at grecc.umaryland.edu> wrote:
> I would like to have a figure with two graphs. This is easily accomplished using mfcol:
>
> oldpar <- par(mfcol=c(1,2))
> plot(x,y)
> plot(z,x)
> par(oldpar)
>
> I run into trouble if I try to use identify with the two plots. If, after identifying points on my first graph I hit the ESC key, or hitting stop menu bar of my R session, the system stops the identification process, but fails to give me my second graph. Is there a way to allow for the identification of points when one is plotting to graphs in a single graph window? My code follows.
>
> plotter <- function(first,second) {
>  # Allow for two plots in on graph window.
>  oldpar<-par(mfcol=c(1,2))
>
>  #Bland-Altman plot.
>  plot((second+first)/2,second-first)
>  abline(0,0)
>  # Allow for indentification of extreme values.
>  BAzap<-identify((second+first)/2,second-first,labels = seq_along(data$Line))
>  print(BAzap)
>
>  # Plot second as a function of first value.
>  plot(first,second,main="Limin vs. Limin",xlab="First (cm^2)",ylab="Second (cm^3)")
>  # Add identity line.
>  abline(0,1,lty=2,col="red")
>  # Allow for identification of extreme values.
>  zap<-identify(first,second,labels = seq_along(data$Line))
>  print(zap)
>  # Add regression line.
>  fit1<-lm(first~second)
>  print(summary(fit1))
>  abline(fit1)
>  print(summary(fit1)$sigma)
>
>  # reset par to default values.
>  par(oldpar)
>
> }
> plotter(first,second)
>
>
> Thanks,
> John
>
>
>
>
>
>
> John David Sorkin M.D., Ph.D.
> Chief, Biostatistics and Informatics
> University of Maryland School of Medicine Division of Gerontology
> Baltimore VA Medical Center
> 10 North Greene Street
> GRECC (BT/18/GR)
> Baltimore, MD 21201-1524
> (Phone) 410-605-7119
> (Fax) 410-605-7913 (Please call phone number above prior to faxing)
>
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