Wolfgang Grond
2021-Apr-09 12:21 UTC
[R] Assigning several lists to variables whose names are contained in other variables
Greg, here I get the error message: Error my_function(val) : cannot find function my_function. Am 9. April 2021 12:35:40 MESZ schrieb Greg Minshall <minshall at umich.edu>:>Wolfgang, > >> result <- assign(paste("subnet_",? val, sep = "") >> >> result <- my_function(val) > >i don't understand why you are twice assigning to =result=. also, the >first assignment doesn't seem well formatted (t's missing a value?). > >did you mean something like > >: assign(paste("subnet_",? val, sep = ""), my_function(val)) > >(which i would think should work)? > >cheers, Greg > >______________________________________________ >R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see >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.- Numberland - Dr. Wolfgang Grond Diplomphysiker, TQM-Assessor (EFQM) Six Sigma Green Belt Ingenieurb?ro / Engineering Consultancy Lohfeld 20, DE-95326 Kulmbach, Germany Phone: +49 9221 6919131 Fax: +49 9221 6919156 Mail: grond at numberland.com URL: http://www.numberland.com [[alternative HTML version deleted]]
Rui Barradas
2021-Apr-09 13:43 UTC
[R] Assigning several lists to variables whose names are contained in other variables
Hello,
my_function seems to be a function you have defined somewhere in your code.
In your original post you mention it 3 times, this is the first one:
subnet_MYSUBNET <- my_function(MYSUBNET)
So Ivan's and Greg's code should work, they use a function you
haven't
posted but is assumed to exist.
Note: if you are more comfortable with for loops than with *apply, I
would rewrite Ivan's for loop solution as
results <- vector("list", length = nrow(datatable))
for(val in datatable$column) {
results[[as.character(val)]] <- my_function(val)
}
To keep extending a vector or list object in a loop is inefficient, this
creates the list with the right length beforehand.
Hope this helps,
Rui Barradas
?s 13:21 de 09/04/21, Wolfgang Grond escreveu:> Greg,
>
> here I get the error message:
>
> Error my_function(val) :
>
> cannot find function my_function.
>
> Am 9. April 2021 12:35:40 MESZ schrieb Greg Minshall <minshall at
umich.edu>:
>> Wolfgang,
>>
>>> result <- assign(paste("subnet_",? val, sep =
"")
>>>
>>> result <- my_function(val)
>>
>> i don't understand why you are twice assigning to =result=. also,
the
>> first assignment doesn't seem well formatted (t's missing a
value?).
>>
>> did you mean something like
>>
>> : assign(paste("subnet_",? val, sep = ""),
my_function(val))
>>
>> (which i would think should work)?
>>
>> cheers, Greg
>>
>> ______________________________________________
>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> 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.
>
>
> -
> Numberland - Dr. Wolfgang Grond
> Diplomphysiker, TQM-Assessor (EFQM)
> Six Sigma Green Belt
> Ingenieurb?ro / Engineering Consultancy
> Lohfeld 20, DE-95326 Kulmbach, Germany
> Phone: +49 9221 6919131
> Fax: +49 9221 6919156
> Mail: grond at numberland.com
> URL: http://www.numberland.com
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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
2021-Apr-09 15:22 UTC
[R] Assigning several lists to variables whose names are contained in other variables
On 4/9/21 5:21 AM, Wolfgang Grond wrote:> Greg, > > here I get the error message: > > Error my_function(val) : > > cannot find function my_function.I'm guessing that you are following someone else's blog and have failed one of two things: - understand that what was meant by the author was that you were assumed to have a function in mind to use for a programming strategy being illustrated - or you were copying and pasting only part of a blog and failed to paste in the code from above where there was earlier code defining `my_function`> > Am 9. April 2021 12:35:40 MESZ schrieb Greg Minshall <minshall at umich.edu>: >> Wolfgang, >> >>> result <- assign(paste("subnet_",? val, sep = "") >>> >>> result <- my_function(val) >> i don't understand why you are twice assigning to =result=. also, the >> first assignment doesn't seem well formatted (t's missing a value?). >> >> did you mean something like >> >> : assign(paste("subnet_",? val, sep = ""), my_function(val)) >> >> (which i would think should work)? >> >> cheers, Greg >> >> ______________________________________________ >> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see >> 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. > > - > Numberland - Dr. Wolfgang Grond > Diplomphysiker, TQM-Assessor (EFQM) > Six Sigma Green Belt > Ingenieurb?ro / Engineering Consultancy > Lohfeld 20, DE-95326 Kulmbach, Germany > Phone: +49 9221 6919131 > Fax: +49 9221 6919156 > Mail: grond at numberland.com > URL: http://www.numberland.com > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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.