Hi Ruiyang, In this case you don't want the "get", just the strings produced by "paste":
mydf<-data.frame(col1=LETTERS[1:10],col2=1:10) rownames(mydf)<-paste("P",mydf$col1,sep="") Jim On Thu, Nov 16, 2017 at 9:22 AM, 刘瑞阳 <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.