Hi, i think that is more easy

MyList <- list(levels(Model[,colnames(Model)[2]]))
names(MyList) <- colnames(Model)[2]


On 07/11/2007, Gang Chen <gangchen@mail.nih.gov> wrote:
>
> Hi,
>
> I really appreciate your help! As I'm still learning basics in R, please
> pardon my simple questions.
>
> It seems
>
> eval(parse(text=paste("MyList<-list(", colnames(Model)[2], "=",
> levels(Model[,colnames(Model)[2]]), ")")))
>
>
> is almost what I want except the following error:
> Error in eval(expr, envir, enclos) : object "M" not found
>
> Well, I tried
>
> > parse(text=paste("MyList<-list(", colnames(Model)[2], "=",
> levels(Model[,colnames(Model)[2]]), ")"))
> expression(MyList<-list( Trust = F ), MyList<-list( Trust = M ))
> attr(,"srcfile")
> <text>
>
> > levels(Model[,colnames(Model)[2]])
> [1] "F" "M"
>
> Is it because we need quotes around F and M for eval the command? If so,
> how can I make it work?
>
> Thanks a million,
> Gang
>
>
>
>
> On Nov 7, 2007, at 2:18 PM, Henrique Dallazuanna wrote:
>
> Try this:
>
> 1)eval(parse(text=paste("MyList<-list(", colnames(Model)[2], "=",
> Model[,colnames(Model)[2]], ")")))
>
> 2)Model[,colnames(Model)[2]]
>
> 3)MyList[[3]] <- "Teste"
>    MyList[[4]] <- "Teste1"
>
>
> --
> Henrique Dallazuanna
> Curitiba-Paraná-Brasil
> 25° 25' 40" S 49° 16' 22" O
>
> On 07/11/2007, Gang Chen <gangchen@mail.nih.gov> wrote:
> >
> >
> > I want to create a list based on the information from a data.frame,
> > Model. So I tried the following:
> >
> > MyList <- list(colnames(Model)[2] = levels(Model$(colnames(Model)[2])))
> >
> > but it failed with an error:
> >
> > Error: unexpected '=' in "list(colnames(Model)[2] ="
> >
> > I have the following problems with this command line:
> >
> > (1) I wanted to use colnames(Model)[2] as a tag for the list:
> >
> > > colnames(Model)[2]
> > [1] "gender"
> >
> > but it is not working as I intended. How to make colnames(Model)[2] a
> > legitimate tag?
> >
> > (2) Model$gender is a column in the data.frame. However Model$
> > (colnames(Model)[2]) seems not recognizable in the command line. How
> > to correct this?
> >
> > (3) How to add more tagged items to an existing list? cbind or rbind?
> >
> > Thanks in advance,
> > Gang
> >
> > ______________________________________________
> > 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.
> >
>
>
>


-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

	[[alternative HTML version deleted]]

