Wouldnt
any_command | more
work fine?
matt_tm
2010-10-01 08:21:31
Probably the guy is inside R, so bash commands are not possible at that stage.
Benoit
2010-10-01 08:22:31
Forgot to make it clear: I am using R in bash in interactive mode, bash commands don't work there.
gojira
2010-10-01 08:36:36
A:
“the bash” has no lines, your terminal has.
You can set the number of lines of your terminal in the settings of that application.
Benoit
2010-10-01 08:21:47
Still, how do I prevent the output from scrolling away if the output has more lines than the currently set number of lines of the terminal? Do you seriously suggest setting the number of lines of the currently used shell according to the length of R's output?
gojira
2010-10-01 08:41:30
+1
A:
A way to do this in R is also to redirect to a file:
sink("a_file.txt")
...your_commands...
sink()
Benoit
2010-10-01 08:54:17
A:
It might be possible to wrap your expression in capture.output, and then page the result to the terminal.
pager <- function(cmd,nlines=10){
output = capture.output(cmd)
pages = seq(1,length(output),by=nlines)
for(p in pages){
f = p
l = min(p+nlines-1,length(output))
cat(paste(output[f:l],"\n"))
readline("*more*")
}
return(invisible(0))
}
Usage: pager(ls()), then hit Return (not space or anything else) at each 'more' prompt.
currently it doesn't return the value. Oh and it fails if there's no output. But you can fix these :)
Or use emacs with ESS and let it all scroll back...
Spacedman
2010-10-01 09:21:05
+1
A:
I think the page() function is like having | less in an R session. It allows two representations of the object; i) a version you'd get from dput(), and ii) a version you'd get if you print()-ed the object.
dat <- data.frame(matrix(rnorm(2000), ncol = 5))
page(dat, method = "print")
Gavin Simpson
2010-10-01 09:23:02
A:
Your question is unclear. If you're talking about using R interactively and accidentally running a command which spits out a huge number of lines, run something like this in your R session: options(max.print=4000)
atp
2010-10-03 12:39:04