thr3ads.net - R help - [R] slide show with R [Mar 2005]

If this information is useful, please help other people find it:
Share via:

George_Heine@blm.gov

2005-Mar-29 20:54 UTC

[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 at my2way.com
<>=<>=<>=<>=<>=<>=<>=<>=<>=<>=<>

Berton Gunter

2005-Mar-29 21:18 UTC

head link

[R] slide show with R

One possible strategy:

see ?readLines

Write a text file with your R commands. Then
write a little function that opens a connection to the file and runs a loop
to:

1)read a line from your file via readLines
2) cat() the line on your terminal
3) prompt via readline to execute it.

You'll have to get a little fancy to check for expressions that span several
lines and check for the end of file, but this should work, I think.

Cheers,

-- Bert Gunter
Genentech Non-Clinical Statistics
South San Francisco, CA
 
"The business of the statistician is to catalyze the scientific learning
process."  - George E. P. Box
 
 
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of 
> George_Heine at 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 at my2way.com
>
<>=<>=<>=<>=<>=<>=<>=<>=<>=<>=<>
> 
> ______________________________________________
> 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
>

Berton Gunter

2005-Mar-29 21:20 UTC

head link

[R] slide show with R

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

eval(parse(text=textline))



-- Bert Gunter
Genentech Non-Clinical Statistics
South San Francisco, CA
 
"The business of the statistician is to catalyze the scientific learning
process."  - George E. P. Box
 
 
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of 
> George_Heine at 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 at my2way.com
>
<>=<>=<>=<>=<>=<>=<>=<>=<>=<>=<>
> 
> ______________________________________________
> 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
>

Michaell Taylor

2005-Mar-29 21:30 UTC

head link

[R] slide show with R

Seems like emacs-ess would do the trick.  You can read in the entire
file - formatted or spaced as appropriate - execute one line or several
at a time and see the results in real time.

Obviously less a "slide show" than an R session, but that seems to be
what you want.  

A more "canned" slide show like approach might be something like
Sweave/Prosper.  This is considerably more work, loses the ability to
interact with the interpreter -- but does achieve a very slick slideshow
sort of look.

On Tue, 2005-03-29 at 14:54, George_Heine at blm.gov
wrote:> 
> 
> 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 at my2way.com
>
<>=<>=<>=<>=<>=<>=<>=<>=<>=<>=<>
> 
> ______________________________________________
> 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
> 
>

Greg Snow

2005-Mar-29 22:18 UTC

head link

[R] slide show with R

Another approach is to put your commands below into a text file.

Add a line like:

tmp <- readline('Press Enter to Continue:')

everywhere you want to pause.

Then do:

source('path/to/text/file', echo=T)

it will print out the commands and execute them, but everytime it gets
to the tmp <- ... line it will pause and wait for you to press enter
before continuing on.  you can discuss the lines that have just been
executed and the current plot, then press enter for the next chunk.

hope this helps,




Greg Snow, Ph.D.
Statistical Data Center
greg.snow at ihc.com
(801) 408-8111
>>> <George_Heine at blm.gov> 03/29/05 01:54PM >>>
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 at my2way.com 
<>=<>=<>=<>=<>=<>=<>=<>=<>=<>=<>

______________________________________________
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

Possibly Parallel Threads

Search for more seemingly similar threads

R help - Mar 2005 - slide show with R

[R] slide show with R

[R] slide show with R

[R] slide show with R

[R] slide show with R

[R] slide show with R

Possibly Parallel Threads