Is this what you want:
> x <- paste("X", 1:10, sep='')
> x
[1] "X1" "X2" "X3" "X4" "X5" "X6" "X7" "X8" "X9" "X10"
> sub("X", "X.", x)
[1] "X.1" "X.2" "X.3" "X.4" "X.5" "X.6" "X.7" "X.8" "X.9" "X.10"
>
On Mon, May 10, 2010 at 8:53 PM, Ravi Ramaswamy <raram...@gmail.com> wrote:
> Hi - a newbie question, if someone can please help....
>
> I want to change X1, X2,,.....to X.1 X.2 etc in the names below. I am
> using
> the Principal Component Regression function (pcr) and it seems to want it
> this way
>
> > datap3.pcr <- pcr(water ~ X, 10, data = datap3, Validation ="cv")
> Error in model.frame.default(formula = water ~ X, data = datap3) :
> invalid type (list) for variable 'X'
>
> ----------
>
> > names(X)
> [1] "X1" "X2" "X3" "X4" "X5" "X6" "X7" "X8" "X9" "X10"
> "X11" "X12" "X13" "X14" "X15" "X16" "X17" "X18" "X19" "X20"
> [21] "X21" "X22" "X23" "X24" "X25" "X26" "X27" "X28" "X29" "X30"
> "X31" "X32" "X33" "X34" "X35" "X36" "X37" "X38" "X39" "X40"
> [41] "X41" "X42" "X43" "X44" "X45" "X46" "X47" "X48" "X49" "X50"
> "X51" "X52" "X53" "X54" "X55" "X56" "X57" "X58" "X59" "X60"
> [61] "X61" "X62" "X63" "X64" "X65" "X66" "X67" "X68" "X69" "X70"
> "X71" "X72" "X73" "X74" "X75" "X76" "X77" "X78" "X79" "X80"
> [81] "X81" "X82" "X83" "X84" "X85" "X86" "X87" "X88" "X89" "X90"
> "X91" "X92" "X93" "X94" "X95" "X96" "X97" "X98" "X99" "X100"
> > names(X)[1]
> [1] "X1"
> > for(i in 1:100){names(X)[i] <- "X.i"}
> > names(X)
> [1] "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i"
> "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i"
> "X.i"
> [25] "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i"
> "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i"
> "X.i"
> [49] "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i"
> "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i"
> "X.i"
> [73] "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i"
> "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i" "X.i"
> "X.i"
> [97] "X.i" "X.i" "X.i" "X.i"
> > for(i in 1:100){names(X)[i] <- X.i}
> Error: object 'X.i' not found
> > for(i in 1:100){names(X)[i] <- "X."i}
>
> [[alternative HTML version deleted]]
>
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>
--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem that you are trying to solve?
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