Re: [R] external variable by inside-function routines modifications
Thanks all of you for your help!!!
2009/10/8 Bert Gunter :
> I am uncertain what you mean. Possibly...
>
> x <- 1
>> f <- function()x<<-2
>> f()
>> x
> [1] 2
>
> HOWEVER, this is very dangerous and most unwise as it depends on scoping
> rules and where f is called to determine exactly which "x" is being assigned
> the value of 2. So I think you would do well to reconsider what you are
> trying to do and recast it to work within R's recommended semantics, which
> is to explicitly assign modified values as the output of functions with the
> original values as arguments.
>
>
> Bert Gunter
> Genentech Nonclinical Biostatistics
>
>
>
> -Original Message-
> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
> Behalf Of Alex Bird
> Sent: Thursday, October 08, 2009 10:23 AM
> To: Henrique Dallazuanna
> Cc: r-help@r-project.org
> Subject: Re: [R] external variable by inside-function routines modifications
>
> Is it possible to do what you mentioned somehow outside of the
> function. I mean that there's some function and the only thing I can
> do is to point on the variable to be modified inside the function
> without any possibilities to modify the very function.
>
> 2009/10/8 Henrique Dallazuanna :
>> See assign, you can use '<<-' assignment:
>>
>> foo <- function(var) var <<- var + 1
>>
>> On Thu, Oct 8, 2009 at 2:14 PM, devol wrote:
>>>
>>> Dear all,
>>>
>>> could you please advice whether it is possible somehow to modify an
>>> external (from the point of some function view) variable by some
>>> function-internal operators. For example
>>>
>>>> var=1
>>>> foo<-function(var){var=var+1}
>>>> foo(var)
>>>> var
>>> [1] 1
>>>
>>> but the goal is to get the var equal to 2 in this specific case.
>>>
>>> Thanks!
>>> --
>>> View this message in context:
> http://www.nabble.com/external-variable-by-inside-function-routines-modifica
> tions-tp25803308p25803308.html
>>> Sent from the R help mailing list archive at Nabble.com.
>>>
>>> __
>>> 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.
>>>
>>
>>
>>
>> --
>> Henrique Dallazuanna
>> Curitiba-Paraná-Brasil
>> 25° 25' 40" S 49° 16' 22" O
>>
>
> __
> 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
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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] external variable by inside-function routines modifications
I am uncertain what you mean. Possibly...
x <- 1
> f <- function()x<<-2
> f()
> x
[1] 2
HOWEVER, this is very dangerous and most unwise as it depends on scoping
rules and where f is called to determine exactly which "x" is being assigned
the value of 2. So I think you would do well to reconsider what you are
trying to do and recast it to work within R's recommended semantics, which
is to explicitly assign modified values as the output of functions with the
original values as arguments.
Bert Gunter
Genentech Nonclinical Biostatistics
-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of Alex Bird
Sent: Thursday, October 08, 2009 10:23 AM
To: Henrique Dallazuanna
Cc: r-help@r-project.org
Subject: Re: [R] external variable by inside-function routines modifications
Is it possible to do what you mentioned somehow outside of the
function. I mean that there's some function and the only thing I can
do is to point on the variable to be modified inside the function
without any possibilities to modify the very function.
2009/10/8 Henrique Dallazuanna :
> See assign, you can use '<<-' assignment:
>
> foo <- function(var) var <<- var + 1
>
> On Thu, Oct 8, 2009 at 2:14 PM, devol wrote:
>>
>> Dear all,
>>
>> could you please advice whether it is possible somehow to modify an
>> external (from the point of some function view) variable by some
>> function-internal operators. For example
>>
>>> var=1
>>> foo<-function(var){var=var+1}
>>> foo(var)
>>> var
>> [1] 1
>>
>> but the goal is to get the var equal to 2 in this specific case.
>>
>> Thanks!
>> --
>> View this message in context:
http://www.nabble.com/external-variable-by-inside-function-routines-modifica
tions-tp25803308p25803308.html
>> Sent from the R help mailing list archive at Nabble.com.
>>
>> __
>> 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.
>>
>
>
>
> --
> Henrique Dallazuanna
> Curitiba-Paraná-Brasil
> 25° 25' 40" S 49° 16' 22" O
>
__
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
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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] external variable by inside-function routines modifications
On Oct 8, 2009, at 1:14 PM, devol wrote:
Dear all,
could you please advice whether it is possible somehow to modify an
external (from the point of some function view) variable by some
function-internal operators. For example
var=1
foo<-function(var){var=var+1}
foo(var)
var
[1] 1
Use functions the way they are designed to be used in R ... to return
values:
> var <- foo(var)
> var
[1] 2
>
but the goal is to get the var equal to 2 in this specific case.
Thanks!
--
View this message in context:
http://www.nabble.com/external-variable-by-inside-function-routines-modifications-tp25803308p25803308.html
Sent from the R help mailing list archive at Nabble.com.
__
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.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
__
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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Re: [R] external variable by inside-function routines modifications
Hi,
with assign,
foo <- function(var){
assign("var", var+1, envir = .GlobalEnv)
}
var =1
foo(2)
var
# [1] 3
HTH,
baptiste
2009/10/8 devol :
>
> Dear all,
>
> could you please advice whether it is possible somehow to modify an
> external (from the point of some function view) variable by some
> function-internal operators. For example
>
>> var=1
>> foo<-function(var){var=var+1}
>> foo(var)
>> var
> [1] 1
>
> but the goal is to get the var equal to 2 in this specific case.
>
> Thanks!
> --
> View this message in context:
> http://www.nabble.com/external-variable-by-inside-function-routines-modifications-tp25803308p25803308.html
> Sent from the R help mailing list archive at Nabble.com.
>
> __
> 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] external variable by inside-function routines modifications
Is it possible to do what you mentioned somehow outside of the
function. I mean that there's some function and the only thing I can
do is to point on the variable to be modified inside the function
without any possibilities to modify the very function.
2009/10/8 Henrique Dallazuanna :
> See assign, you can use '<<-' assignment:
>
> foo <- function(var) var <<- var + 1
>
> On Thu, Oct 8, 2009 at 2:14 PM, devol wrote:
>>
>> Dear all,
>>
>> could you please advice whether it is possible somehow to modify an
>> external (from the point of some function view) variable by some
>> function-internal operators. For example
>>
>>> var=1
>>> foo<-function(var){var=var+1}
>>> foo(var)
>>> var
>> [1] 1
>>
>> but the goal is to get the var equal to 2 in this specific case.
>>
>> Thanks!
>> --
>> View this message in context:
>> http://www.nabble.com/external-variable-by-inside-function-routines-modifications-tp25803308p25803308.html
>> Sent from the R help mailing list archive at Nabble.com.
>>
>> __
>> 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.
>>
>
>
>
> --
> Henrique Dallazuanna
> Curitiba-Paraná-Brasil
> 25° 25' 40" S 49° 16' 22" O
>
__
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] external variable by inside-function routines modifications
See assign, you can use '<<-' assignment:
foo <- function(var) var <<- var + 1
On Thu, Oct 8, 2009 at 2:14 PM, devol wrote:
>
> Dear all,
>
> could you please advice whether it is possible somehow to modify an
> external (from the point of some function view) variable by some
> function-internal operators. For example
>
>> var=1
>> foo<-function(var){var=var+1}
>> foo(var)
>> var
> [1] 1
>
> but the goal is to get the var equal to 2 in this specific case.
>
> Thanks!
> --
> View this message in context:
> http://www.nabble.com/external-variable-by-inside-function-routines-modifications-tp25803308p25803308.html
> Sent from the R help mailing list archive at Nabble.com.
>
> __
> 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.
>
--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
__
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] external variable by inside-function routines modifications
Dear all,
could you please advice whether it is possible somehow to modify an
external (from the point of some function view) variable by some
function-internal operators. For example
> var=1
> foo<-function(var){var=var+1}
> foo(var)
> var
[1] 1
but the goal is to get the var equal to 2 in this specific case.
Thanks!
--
View this message in context:
http://www.nabble.com/external-variable-by-inside-function-routines-modifications-tp25803308p25803308.html
Sent from the R help mailing list archive at Nabble.com.
__
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.
