RE: [R] slide show with R

From: Berton Gunter <gunter.berton_at_gene.com>
Date: Wed 30 Mar 2005 - 07:20:31 EST


Oops, I should have said that you can execute the text line via the construction:

eval(parse(text=textline))

"The business of the statistician is to catalyze the scientific learning process." - George E. P. Box    

> -----Original Message-----
> From: r-help-bounces@stat.math.ethz.ch
> [mailto:r-help-bounces@stat.math.ethz.ch] On Behalf Of
> George_Heine@blm.gov
> Sent: Tuesday, March 29, 2005 12:54 PM
> To: R-Help
> Subject: [R] slide show with R
>
>
>
>
>
> Trying to use R to build an interactive "slide show", to be
> displayed on a
> projector. The purpose of the presentation is to show how one could
> construct a simple graph using R. It is meant as a general
> overview rather
> than as detailed instruction.
>
> For example, something like the following sequence of commands. At
> lecture time, I want the interpreter to read these commands
> one at a time
> from a file, display and execute the command, (or two or
> three commands)
> and then wait for another prompt.
>
> pale.yellow="#ffff99"
> par(bg=pale.yellow)
> plot(c(0,2*pi),c(-1,1),type="n",ylab="",yaxt="n")
> mirror<-function(t) { c(t,rev(2*max(t)-t)) }
> z<-log(1:1000)/log(1000)
> zz<-z*pi/2
> zzz<-mirror(mirror(zz))
> polygon(zzz,sin(25*zzz)*sin(zzz),border="blue")
> polygon(zzz,sin(5*zzz)*sin(zzz),border="green")
> polygon(zzz,sin(zzz),lwd=2)
> points(zzz,rep(0,length(zzz)),col="red",pch="|")
>
>
> Wrapping the following around each command works, sort of :
>
> a<-expression(<command>)
> x<-readline(a)
> eval(a)
>
> However, this doesn't work properly for the function
> definition, and it
> gets very clumsy to display two or three lines as a block and then
> evaluate.
>
> Any help would be much appreciated.
>
>
> <>=<>=<>=<>=<>=<>=<>=<>=<>=<>=<>
> George Heine, PhD
> Mathematical Analyst
> National IRM Center
> U.S. Bureau of Land Management
> voice (303) 236-0099
> fax (303) 236-1974
> cell (303) 905-5382
> pager gheine@my2way.com
> <>=<>=<>=<>=<>=<>=<>=<>=<>=<>=<>
>
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R-help@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 Received on Wed Mar 30 07:32:32 2005

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