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Sybille Wendel

2008-Jun-18 08:36 UTC

[R] paste data

Hello,

I need a command.
I have a lot of data in different dataframes(auto.0a, auto.0b, auto.0c,
auto.5Na,...), that has similar names.

I could print the names all at once wih a loop with the command paste(), see
below:

plot<-c("0a","0b","0c","5Na","5Nb","5Nc","PKa","PKb","PKc","5NPKa","5NPKb",
	"5NPKc","10NPKa","10NPKb","10NPKc","20NPKa","20NPKb","20NPKc")

for (x in 1:length(plot))
{
	name<-paste("auto.",plot[x],sep="")
	print(name)
}

I want to do very similar things with all the dataframes and their structure is
also the same.
Is there a way to write a loop? (so that I don't have to write the same 18
times)
I tried things like that:

for (x in 1:length(plot))
{
	plot(paste("auto.",plot[x],sep="")[,1],paste("auto.",plot[x],sep="")[,2],col=...)
}

But it doesn't work because it just takes the character "auto.0a".


Thanks a lot for your help,
Sybille Wendel


--

Søren Højsgaard

2008-Jun-18 08:46 UTC

head link

[R] paste data

You can put all dataframes into a list L, e.g.

L <- list(auto.0a, auto.0b,...)

and then do either a for-loop or use lapply. For example

for (ii in 1:length(L)){
  plot(y~x, data=L[[ii]],...)	
} 

or 

lapply(L, function(d) plot(y~x, data=d)


Med venlig hilsen
S?ren H?jsgaard
 


-----Oprindelig meddelelse-----
Fra: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] P?
vegne af Sybille Wendel
Sendt: 18. juni 2008 10:36
Til: r-help at r-project.org
Emne: [R] paste data

Hello,

I need a command.
I have a lot of data in different dataframes(auto.0a, auto.0b, auto.0c,
auto.5Na,...), that has similar names.

I could print the names all at once wih a loop with the command paste(), see
below:

plot<-c("0a","0b","0c","5Na","5Nb","5Nc","PKa","PKb","PKc","5NPKa","5NPKb",
	"5NPKc","10NPKa","10NPKb","10NPKc","20NPKa","20NPKb","20NPKc")

for (x in 1:length(plot))
{
	name<-paste("auto.",plot[x],sep="")
	print(name)
}

I want to do very similar things with all the dataframes and their structure is
also the same.
Is there a way to write a loop? (so that I don't have to write the same 18
times) I tried things like that:

for (x in 1:length(plot))
{
	plot(paste("auto.",plot[x],sep="")[,1],paste("auto.",plot[x],sep="")[,2],col=...)
}

But it doesn't work because it just takes the character "auto.0a".


Thanks a lot for your help,
Sybille Wendel


--

______________________________________________
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.

Ido M. Tamir

2008-Jun-18 08:49 UTC

head link

[R] paste data

>I want to do very similar things with all the dataframes and their structure
>is also the same.
>Is there a way to write a loop? (so that I don't have to write the same
18
>times)
>I tried things like that:
>for (x in 1:length(plot))
>{
>       plot(paste("auto.",plot[x],sep="")[,1],
>       paste("auto.",plot[x],sep="")[,2],col=...) 
>}
you need to get() the data frames.


for (x in 1:length(plot))
{
	df  <- get(plot[x])
        plot(df[,1],df[,2],col=...)
}


HTH,
ido

Ray Brownrigg

2008-Jun-18 08:58 UTC

head link

[R] paste data

get() is your friend.

Try:
for (x in 1:length(plot))
{
	thisdf <- paste("auto.", plot[x], sep="")
	plot(thisdf[, 1], thisdf[, 2], col=...)
}

HTH,
Ray Brownrigg

Sybille Wendel wrote:> Hello,
> 
> I need a command.
> I have a lot of data in different dataframes(auto.0a, auto.0b, auto.0c,
auto.5Na,...), that has similar names.
> 
> I could print the names all at once wih a loop with the command paste(),
see below:
> 
>
plot<-c("0a","0b","0c","5Na","5Nb","5Nc","PKa","PKb","PKc","5NPKa","5NPKb",
> 
"5NPKc","10NPKa","10NPKb","10NPKc","20NPKa","20NPKb","20NPKc")
> 
> for (x in 1:length(plot))
> {
> 	name<-paste("auto.",plot[x],sep="")
> 	print(name)
> }
> 
> I want to do very similar things with all the dataframes and their
structure is also the same.
> Is there a way to write a loop? (so that I don't have to write the same
18 times)
> I tried things like that:
> 
> for (x in 1:length(plot))
> {
> 
plot(paste("auto.",plot[x],sep="")[,1],paste("auto.",plot[x],sep="")[,2],col=...)
> }
> 
> But it doesn't work because it just takes the character
"auto.0a".
> 
> 
> Thanks a lot for your help,
> Sybille Wendel
> 
> 
> --
> 
> ______________________________________________
> 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.

Hans-Joerg Bibiko

2008-Jun-18 09:01 UTC

head link

[R] paste data

On 18 Jun 2008, at 10:36, Sybille Wendel wrote:> I need a command.
> I have a lot of data in different dataframes(auto.0a, auto.0b, auto. 
> 0c, auto.5Na,...), that has similar names.
>
> I could print the names all at once wih a loop with the command  
> paste(), see below:
>
> plot<- 
>
c("0a","0b","0c","5Na","5Nb","5Nc","PKa","PKb","PKc","5NPKa","5NPKb",
> 
"5NPKc","10NPKa","10NPKb","10NPKc","20NPKa","20NPKb","20NPKc")
>
> for (x in 1:length(plot))
> {
> 	name<-paste("auto.",plot[x],sep="")
> 	print(name)
> }
>
First of all, maybe it is better to avoid to name a variable 'plot'.  
It works, but it could be a bit confusing.

You can do this easier (paste can handle vectors etc.):
name<-paste("auto.", plot, sep="")

> I want to do very similar things with all the dataframes and their  
> structure is also the same.
> Is there a way to write a loop? (so that I don't have to write the  
> same 18 times)
> I tried things like that:
>
> for (x in 1:length(plot))
> {
> 
plot(paste("auto.",plot[x],sep="")[,1],paste("auto.",plot[x],sep="")
> [,2],col=...)
> }

paste("auto.",plot[x],sep="")[,1]  => doesn't work.

Assuming that 'auto.0a' is a data.frame you should use

get(paste("auto",".0a",sep=''))[,1]

instead to get the first column of the data.frame 'auto.0a'

Maybe try:

plot(get(paste("auto.",plot[x],sep=""))[,1],  
get(paste("auto.",plot[x],sep=""))[,2], col=...)

--Hans

Peter Dalgaard

2008-Jun-18 09:11 UTC

head link

[R] paste data

Sybille Wendel wrote:> Hello,
>
> I need a command.
> I have a lot of data in different dataframes(auto.0a, auto.0b, auto.0c,
auto.5Na,...), that has similar names.
>
> I could print the names all at once wih a loop with the command paste(),
see below:
>
>
plot<-c("0a","0b","0c","5Na","5Nb","5Nc","PKa","PKb","PKc","5NPKa","5NPKb",
> 
"5NPKc","10NPKa","10NPKb","10NPKc","20NPKa","20NPKb","20NPKc")
>
> for (x in 1:length(plot))
> {
> 	name<-paste("auto.",plot[x],sep="")
> 	print(name)
> }
>
> I want to do very similar things with all the dataframes and their
structure is also the same.
> Is there a way to write a loop? (so that I don't have to write the same
18 times)
> I tried things like that:
>
> for (x in 1:length(plot))
> {
> 
plot(paste("auto.",plot[x],sep="")[,1],paste("auto.",plot[x],sep="")[,2],col=...)
> }
>
> But it doesn't work because it just takes the character
"auto.0a".
>
>   The short answer is get(), but this is an opportunity to get yoursellf
acquainted with the mindframe of vectorization in R:

plotNames<-c("0a","0b","0c","5Na","5Nb","5Nc","PKa","PKb","PKc","5NPKa","5NPKb",
"5NPKc","10NPKa","10NPKb","10NPKc","20NPKa","20NPKb","20NPKc")
frames <- lapply(paste("auto", plotNames, sep="."), get)
plotOne <- function(f,n)
    plot(f[1:2], title="n")
mapply(plotOne, frames, plotNames)

-- 
   O__  ---- Peter Dalgaard             ?ster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark      Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)              FAX: (+45) 35327907

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