Re: [R] Extracting the name of an object into a character string and vice versa
On Dec 12, 2008, at 8:41 AM, Gabor Grothendieck wrote:
Its a FAQ:
http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-I-turn-a-string-into-a-variable_003f
On Fri, Dec 12, 2008 at 8:30 AM, Philip Whittall
wrote:
I am still struggling to map a character string to an object name and
vice versa in R.
I thought the as.name() function might work, but observe the
following
behaviour ...
attach(warpbreaks)
levels(tension)
[1] "L" "M" "H"
levels(as.name("tension"))
NULL
objectname<-as.name("tension")
objectname
tension
levels(objectname)
NULL
So even though it sets up a symbol, this symbol isn't recognised as
an
object name by functions such as levels().
I need 2 functions, call them A and B such that A("tension") yields
the
object name tension which is recognised by functions and
B(tension) yields the character result "tension".
I see that your first request was satisfied. Your second one, that for
a method to get as a character object the name of an object did not
seem to get addressed. If tension is an R object (or a function call),
try:
---a vector
> tension <- vector()
> as.character(bquote(tension))
[1] "tension"
--- a function with no arguments
> as.character(bquote(ls()))
[1] "ls"
--- a function ( in this case the Extract or indexing function) with
arguments
> as.character(bquote(fit$terms))
[1] "$" "fit" "terms"
--
David Winsemius
Any suggestions would be greatly appreciated,
Philip
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Re: [R] Extracting the name of an object into a character string and vice versa
paste()
?paste
- Original Message -
From: "Philip Whittall"
To:
Sent: Friday, December 12, 2008 1:30 PM
Subject: Re: [R] Extracting the name of an object into a character string
and vice versa
I am still struggling to map a character string to an object name and
vice versa in R.
I thought the as.name() function might work, but observe the following
behaviour ...
attach(warpbreaks)
levels(tension)
[1] "L" "M" "H"
levels(as.name("tension"))
NULL
objectname<-as.name("tension")
objectname
tension
levels(objectname)
NULL
So even though it sets up a symbol, this symbol isn't recognised as an
object name by functions such as levels().
I need 2 functions, call them A and B such that A("tension") yields the
object name tension which is recognised by functions and
B(tension) yields the character result "tension".
Any suggestions would be greatly appreciated,
Philip
This message should be regarded as confidential. If you have received this
email in error please notify the sender and destroy it immediately.
Statements of intent shall only become binding when confirmed in hard copy
by an authorised signatory. The contents of this email may relate to
dealings with other companies within the Detica Group plc group of
companies.
Detica Limited is registered in England under No: 1337451.
Registered offices: Surrey Research Park, Guildford, Surrey, GU2 7YP,
England.
[[alternative HTML version deleted]]
__
R-help@r-project.org 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.
__
R-help@r-project.org 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.
Re: [R] Extracting the name of an object into a character string and vice versa
Its a FAQ:
http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-I-turn-a-string-into-a-variable_003f
On Fri, Dec 12, 2008 at 8:30 AM, Philip Whittall
wrote:
>
> I am still struggling to map a character string to an object name and
> vice versa in R.
> I thought the as.name() function might work, but observe the following
> behaviour ...
>
>> attach(warpbreaks)
>> levels(tension)
> [1] "L" "M" "H"
>> levels(as.name("tension"))
> NULL
>> objectname<-as.name("tension")
>> objectname
> tension
>> levels(objectname)
> NULL
>
> So even though it sets up a symbol, this symbol isn't recognised as an
> object name by functions such as levels().
>
> I need 2 functions, call them A and B such that A("tension") yields the
> object name tension which is recognised by functions and
> B(tension) yields the character result "tension".
>
> Any suggestions would be greatly appreciated,
>
> Philip
>
>
>
>
>
>
>
>
>
> This message should be regarded as confidential. If you have received this
> email in error please notify the sender and destroy it immediately.
> Statements of intent shall only become binding when confirmed in hard copy by
> an authorised signatory. The contents of this email may relate to dealings
> with other companies within the Detica Group plc group of companies.
>
> Detica Limited is registered in England under No: 1337451.
>
> Registered offices: Surrey Research Park, Guildford, Surrey, GU2 7YP, England.
>
>
>
>[[alternative HTML version deleted]]
>
> __
> R-help@r-project.org 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.
>
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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] Extracting the name of an object into a character string and vice versa
I am still struggling to map a character string to an object name and
vice versa in R.
I thought the as.name() function might work, but observe the following
behaviour ...
> attach(warpbreaks)
> levels(tension)
[1] "L" "M" "H"
> levels(as.name("tension"))
NULL
> objectname<-as.name("tension")
> objectname
tension
> levels(objectname)
NULL
So even though it sets up a symbol, this symbol isn't recognised as an
object name by functions such as levels().
I need 2 functions, call them A and B such that A("tension") yields the
object name tension which is recognised by functions and
B(tension) yields the character result "tension".
Any suggestions would be greatly appreciated,
Philip
This message should be regarded as confidential. If you have received this
email in error please notify the sender and destroy it immediately.
Statements of intent shall only become binding when confirmed in hard copy by
an authorised signatory. The contents of this email may relate to dealings
with other companies within the Detica Group plc group of companies.
Detica Limited is registered in England under No: 1337451.
Registered offices: Surrey Research Park, Guildford, Surrey, GU2 7YP, England.
[[alternative HTML version deleted]]
__
R-help@r-project.org mailing list
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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.
