Hi
How about ...
# Data
lines = "Col1 Col2 Col3 Col4
Text1 Text2 X0.1 5
Text1 Text2 X0.2 10
Text1 Text2 X0.3 15
Text1 Text3 X0.1 5
Text1 Text3 X0.2 10
Text1 Text3 X0.3 15"
# Create Dataframe
DF <- read.table(textConnection(lines), header = TRUE, check.names = FALSE)
# Create Numeric Variable
DF$Col5 = as.numeric(sub("X","",DF$Col3))
HTH
Pete
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