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}
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