R help - Oct 2013 - Looping over names of multiple data frames in an R for() loop XXXX

Hi everybody,

I thought I was using the get() fn correctly here to loop over multiple
data frame names in an R for() loop. Can someone advise?

> miss<-c("#NULL!","999")
> d<-c("d1","d2","d3","d4")
>
> for(i in 1:4){
+
+ miss1<-ifelse(i<=2,miss[1],miss[2])
+ miss1
+
+
get(d[i])<-read.csv(paste("C:\\DATA\\Data\\Original\\",dsn[i],sep=""),
+ na.strings=c(miss1,"999999999"))
+
+ head(get(d[i]))
+
+
write.csv(get(d[i]),paste("C:\\DATA\\Data\\",dsn[i],sep=""),
+ na=".")
+
+ }
Error in get(d[i]) <- read.csv(paste("C:\\DATA\\Data\\Original\\",
dsn[i],
:
  could not find function "get<-"
>
Thanks!

Dan

	[[alternative HTML version deleted]]

I think you want 'assign' at that point.  Would suggest using a
'list'
to store the input instead of unique named objects.  'list's are
easier to manage.

Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.


On Fri, Oct 11, 2013 at 2:59 PM, Dan Abner <dan.abner99 at gmail.com>
wrote:
> Hi everybody,
>
> I thought I was using the get() fn correctly here to loop over multiple
> data frame names in an R for() loop. Can someone advise?
>
>
>> miss<-c("#NULL!","999")
>> d<-c("d1","d2","d3","d4")
>>
>> for(i in 1:4){
> +
> + miss1<-ifelse(i<=2,miss[1],miss[2])
> + miss1
> +
> +
get(d[i])<-read.csv(paste("C:\\DATA\\Data\\Original\\",dsn[i],sep=""),
> + na.strings=c(miss1,"999999999"))
> +
> + head(get(d[i]))
> +
> +
write.csv(get(d[i]),paste("C:\\DATA\\Data\\",dsn[i],sep=""),
> + na=".")
> +
> + }
> Error in get(d[i]) <-
read.csv(paste("C:\\DATA\\Data\\Original\\", dsn[i],
> :
>   could not find function "get<-"
>>
>
> Thanks!
>
> Dan
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at 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.

You might want to try:
assign(d[1], read.csv("yourfile.csv"))

...
write.csv(d1, "yourfile.csv", append = FALSE)

Regards
Mikkel



On Friday, October 11, 2013 2:53 PM, Dan Abner <dan.abner99@gmail.com>
wrote:
 
Hi everybody,

I thought I was using the get() fn correctly here to loop over multiple
data frame names in an R for() loop. Can someone advise?

> miss<-c("#NULL!","999")
> d<-c("d1","d2","d3","d4")
>
> for(i in 1:4){
+
+ miss1<-ifelse(i<=2,miss[1],miss[2])
+ miss1
+
+
get(d[i])<-read.csv(paste("C:\\DATA\\Data\\Original\\",dsn[i],sep=""),
+ na.strings=c(miss1,"999999999"))
+
+ head(get(d[i]))
+
+
write.csv(get(d[i]),paste("C:\\DATA\\Data\\",dsn[i],sep=""),
+ na=".")
+
+ }
Error in get(d[i]) <- read.csv(paste("C:\\DATA\\Data\\Original\\",
dsn[i],
:
  could not find function "get<-"
>
Thanks!

Dan

    [[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.
	[[alternative HTML version deleted]]