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temp1x
2011 Mar 02
1
a question on sqldf's handling of missing value and factor
Dear subscribers:
I am using the following code to read a large number of big text files:
library(sqldf)
tempd <- file(XXXX)
tempdx <- sqldf("select * from tempd", dbname = tempfile(), file.format =
list(header = T, sep="\t", row.names = F))
The problem is: all my numberical variable become factor (maybe because
these columns all contain missing value). It would be quite cubersome to
convert them to nume...