I'm trying to write a Rscript program capable of reading several tables from
the
standard input. The problem is that the tables aren't in files because they are
coming from another process that is generating them. From the R-console the
following works pretty well:
|> f <- stdin()
|> t <- read.table(f)
|> t2 <- read.table(f)
|> t
uno dos
01 3 4
02 5 6
03 7 8
|> t2
uno dos
01 9 10
02 11 12
03 13 14
|> t + t2
uno dos
01 12 14
02 16 18
03 20 22
Being aware of the differences between stdin(), and file("stdin"), I wrote a
Rscript program that is aimed at doing the same as the shown interactive
session:
#! /usr/bin/Rscript
f <- file("stdin")
t <- read.table(f)
t2 <- read.table(f)
print (t + t2)
When I try this script, it always ends in error, as follows:
FIRST TRY:
$ ./addT.R
uno dos
01 3 4
02 5 6
03 7 8
<-I introduced an emtpy line here
uno dos
Error en scan(file, what, nmax, sep, dec, quote, skip, nlines, na.strings, :
la linea 4 no tiene 3 elementos
Calls: read.table -> scan
Ejecución interrumpida
SECOND TRY
$ ./addT.R
uno dos
01 3 4
02 5 6
03 7 8
<-I introduced the EOF terminator (^D) here
Error en isOpen(file, "rt") : conexión inválida
Calls: read.table -> isOpen
Ejecución interrumpida
Do you have any comments on this?
Thanks,
-- Sergio.
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