Re: [R] deparse(substitute(foo))
See ?match.call
On 7/27/06, Armstrong, Whit [EMAIL PROTECTED] wrote:
I see that plot.default uses deparse(substitute(x)) to extract the
character name of an argument and put it on the vertical axis.
Hence:
foo - 1:10
plot( foo )
will put the label foo on the vertical axis.
However, for a function that takes a ... list as an input, I can only
extract the first argument name:
x - 1:10
y - 10:20
foo - function(...) {
print(deparse(substitute(...)))
}
foo(x,y)
returns:
foo(x,y)
[1] x
and when I try to convert the list to a local variable and then extract
names, that doesn't work either:
x - 1:10
y - 10:20
foo - function(...) {
x - list(...)
print(deparse(substitute(names(x
}
foo(x,y)
returns:
foo(x,y)
[1] names(list(c(1, 2, 3, 4, 5, 6, 7, 8, 9, 10), c(10, 11, 12, 13,
[2] 14, 15, 16, 17, 18, 19, 20)))
Can someone suggest a way to extract the variable names when they are
passed as a list via ... ?
Thanks,
Whit
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Re: [R] deparse(substitute(foo))
On Thu, 2006-07-27 at 08:18 -0400, Armstrong, Whit wrote:
I see that plot.default uses deparse(substitute(x)) to extract the
character name of an argument and put it on the vertical axis.
Hence:
foo - 1:10
plot( foo )
will put the label foo on the vertical axis.
However, for a function that takes a ... list as an input, I can only
extract the first argument name:
x - 1:10
y - 10:20
foo - function(...) {
print(deparse(substitute(...)))
}
foo(x,y)
returns:
foo(x,y)
[1] x
and when I try to convert the list to a local variable and then extract
names, that doesn't work either:
x - 1:10
y - 10:20
foo - function(...) {
x - list(...)
print(deparse(substitute(names(x
}
foo(x,y)
returns:
foo(x,y)
[1] names(list(c(1, 2, 3, 4, 5, 6, 7, 8, 9, 10), c(10, 11, 12, 13,
[2] 14, 15, 16, 17, 18, 19, 20)))
Can someone suggest a way to extract the variable names when they are
passed as a list via ... ?
Thanks,
Whit
Try this:
x - 1:10
y - 10:20
foo - function(...) {
sapply(match.call()[-1], deparse)
}
foo(x, y)
[1] x y
HTH,
Marc Schwartz
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] deparse(substitute(foo))
That works perfectly.
Thanks,
Whit
-Original Message-
From: Marc Schwartz [mailto:[EMAIL PROTECTED]
Sent: Thursday, July 27, 2006 8:41 AM
To: Armstrong, Whit
Cc: r-help@stat.math.ethz.ch
Subject: Re: [R] deparse(substitute(foo))
On Thu, 2006-07-27 at 08:18 -0400, Armstrong, Whit wrote:
I see that plot.default uses deparse(substitute(x)) to extract the
character name of an argument and put it on the vertical axis.
Hence:
foo - 1:10
plot( foo )
will put the label foo on the vertical axis.
However, for a function that takes a ... list as an input, I can
only extract the first argument name:
x - 1:10
y - 10:20
foo - function(...) {
print(deparse(substitute(...)))
}
foo(x,y)
returns:
foo(x,y)
[1] x
and when I try to convert the list to a local variable and then
extract names, that doesn't work either:
x - 1:10
y - 10:20
foo - function(...) {
x - list(...)
print(deparse(substitute(names(x
}
foo(x,y)
returns:
foo(x,y)
[1] names(list(c(1, 2, 3, 4, 5, 6, 7, 8, 9, 10), c(10, 11, 12, 13,
[2] 14, 15, 16, 17, 18, 19, 20)))
Can someone suggest a way to extract the variable names when they are
passed as a list via ... ?
Thanks,
Whit
Try this:
x - 1:10
y - 10:20
foo - function(...) {
sapply(match.call()[-1], deparse)
}
foo(x, y)
[1] x y
HTH,
Marc Schwartz
This e-mail message is intended only for the named recipient(s) above. It may
contain confidential information. If you are not the intended recipient you are
hereby notified that any dissemination, distribution or copying of this e-mail
and any attachment(s) is strictly prohibited. If you have received this e-mail
in error, please immediately notify the sender by replying to this e-mail and
delete the message and any attachment(s) from your system. Thank you.
__
R-help@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
and provide commented, minimal, self-contained, reproducible code.
