Do you mean that you have
One data frame, and it has a bunch of variables within it named P1, P2,
P3...
or
A bunch of data frames names P1, P2, P3...
?
I'll assume it's the latter. Here is one way:
dfnms < c('P1', 'P2', 'P3')
for (nm in dfnms) {
tmp <- get(nm)
rownames(tmp) <- tmp[[1]]
assign(nm, tmp)
}
The get() and assign() functions have position and/or environment arguments.
You might have to supply those.
You wouldn't have to use get() and assign() if the data frames were stored as
elements of a list. This is sometimes a good way to do things.
mydfs <- list(P1=P1, P2=P2, P3=P3)
for (idf in seq(mydfs)) rownames(mydfs[[idf]]) <- mydfs[[idf]][[1]]
Of course, then you can't do, for example,
plot( P1$x, P1$y)
you would have to do
plot(mydf$P1$x, mydf$P1$y)
or instead of
with(P1, plot(x,y))
you would have to do
with(mydf$P1, plot(x,y))
(all of the above is untested, so watch out for typing errors)
-Don
--
Don MacQueen
Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062
Lab cell 925-724-7509
On 11/15/17, 2:22 PM, "R-help on behalf of 刘瑞阳" <r-help-boun...@r-project.org
on behalf of ruiyangli...@gmail.com> wrote:
Hi,
Thanks for your reply.
I just came up with another question about a similar but different thing:
Say I have a bunch of data.frame variables named P1,P2,P3… I want to assign
them row names according to symbols in the first column, and I want to do this
using a for loop. How could I accomplish this?
for (test_sample in c(1:10)){
+ x<-as.name(paste(“P",as.character(test_sampel),sep=""))
+ rownames(x)<-get((paste(“P”,as.character(test_sample),sep="")))[,1]
+ }
This would not work probably because x is simply a name instead of a
data.frame variable(Error: "attempt to set 'rownames' on an object with no
dimensions"). But I could not find the right way out… How should I solve it?
Thanks!
Ruiyang
> On Nov 14, 2017, at 4:39 PM, Jim Lemon <drjimle...@gmail.com> wrote:
>
> Hi Ruiyang,
> I think you want "get":
>
> For (index in seq(1,16)){
> plot(x=(a given set of
value),y=get(paste(“PC”,as.character(index),sep=“”)))
> }
>
> On Wed, Nov 15, 2017 at 7:43 AM, 刘瑞阳 <ruiyangli...@gmail.com> wrote:
>> Hi,
>> Suppose that I want to do a series of plots with the y value for each
plot as PC1, PC2, PC3… How could I accomplish this using a for loop?
>> Suppose the code like this:
>>
>> For (index in seq(1,16)){
>> plot(x=(a given set of value),y=paste(“PC”,as.character(index),sep=“”)
>> }
>>
>> But this would not work because y is assigned a string instead of the
variable names. So how could I assign y with a variable name instead of a
string? Your reply would be appreciated!
>> Ruiyang Liu
>> ______________________________________________
>> R-help@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.
______________________________________________
R-help@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.
______________________________________________
R-help@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.
