[R] Using pipe for input data

[Hayashi Soichi - shayas]

Hi. 

I have asked this question before and Aaron J. Mackey and Tony Plate gave me
some great insight but I still can't figure out how to do what I am trying
to accomplish. So let me ask again...

What I am trying to do is to make R read data from pipe (stdin).

Say I have following files on my directory

my.dat
       apple 1
       orange 2
       grape 3

my.R
       d <- read.table( stdin(), header=F, dec='.',
col.names=c("name","type"), na.strings=c("xxxx"))
       summary(d)

and When I run this command
       
       cat my.dat | R CMD BATCH --vanilla --slave my.R

I am expecting to see the summery report for the datasource my.dat

But here is what I actually see in my.Rout
	> d <- read.table( stdin(), header=F, dec='.',
col.names=c("name","type"), na.strings=c("xxxx"))
	0: summary(d)
	1: proc.time()
	2: Error in scan(file = file, what = what, sep = sep, quote = quote,
dec = dec,  :
	line 1 did not have 2 elements 
	Execution halted

If I execute the content of the my.R on regular R command line, I can
actually "type in" all datasource and creates the correct summery report. So
I don't know why I can make R to read the input from the piped datasource...

Has anybody done something like this? 

Thanks,
Soichi Hayashi




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