[R] re place column names

[hochoi]

Hi,

When I tried to replace column names in a data set with label names read
from a separated file,
I got the following message:

Error in `[.data.frame` (dataset, , classlabel): undefined columns selected

I am new in R programming languague. Could someone please tell me what do I
need to consider in the dataset dataframe.
There are no column names in the dataset dataframe,
When I entered
dimnames(dataset)[[2]]
[1] "X1"  "X2"  "X3"  "X4"  "X5"  "X6"  "X7"  "X8"  "X9"  "X10" "X11" "X12"

[13] "X13" "X14" "X15" "X16" "X17" "X18" "X19" "X20" "X21" "X22" "X23" "X24"

[25] "X25" "X26" "X27" "X34" "X35" "X36" "X37" "X38" "X28" "X29" "X30" "X31"

[37] "X32" "X33"

Thanks
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