[R] shQuote and cat

Dear R-users, It is my understanding that cat(shQuote(a.string)) should print the origintal a.string. Is this right? I am not sure cat() correctly prints strings which are generated by triple-shQuote(): > shQuote(shQuote("a")) [1] "\"\\\"a\\\"\"" > cat(shQuote(shQuote(shQuote("a"))), '\n') "\"\

[R] operating on arrays of unknown dimensionality

Dear R-users, I am looking for a way to assign to slices of arrays where dimensionality of the array is not a-priory known. Specifically, I would like to be able to generalize the following example of dimensionality 2 to an arbitrary diminsionality: In this example we create an array x, a smal

[R] stopifnot message mutation

Dear R-users, Could someone please explain why the message printed by function stopifnot2, see below, is different from that of stopifnot itself? Thank you for your help, Vadim > stopifnot2 <- function(...) stopifnot(...) > stopifnot(F) Error: F is not TRUE > stopifnot2(F) Error: ..1 is not TR

Re: [R] stopifnot message mutation

Vadim From: Charles C. Berry [EMAIL PROTECTED] Sent: Friday, August 15, 2008 2:27 PM To: Vadim Organovich Cc: r-help@r-project.org Subject: Re: [R] stopifnot message mutation On Fri, 15 Aug 2008, Vadim Organovich wrote: > Dear R-users, > > Could someone please explain why the message prin

[R] writintg wrappers around save()

Dear R-users, I am trying to write a wrapper function around save() that will report the file which is being saved to. So I thought that the followintg would do the trick, but it doesn't. I understand that 'y' is somehow not visible inside save.verbose, but don't know how to fix this. save.ve

[R] computing on expressions

Dear R-users, Suppose I have an expression: expr = expression(a>0) and now I want to modify it to expression(a>0 & b>0). The following doesn't work: expr = expression(expr & b>0) What would be a good way of doing this? Thanks, Vadim Note: This email is for t

Re: [R] computing on expressions

Thanks! Here is a less verbose variation based on suggestion by Phil Spector: parse(text=paste(expression(a>0), "& b>0")) From: Henrique Dallazuanna [EMAIL PROTECTED] Sent: Friday, October 03, 2008 11:08 AM To: Vadim Organovich Cc:

[R] making array of lists

Dear R Users, Given two vectors, say a = seq(2) and b = seq(3), I want to make an 2*3 array, where (i,j) element is list(a=a[i], b=b[j]). I tried the outer() function but it generates an error message that I don't understand, see below. What do I do wrong? The expan.grid function is not