2 messages · Benjamin M. Osborne, John Fox
When reading a data set into R using readLines, na.strings="-99.99" is ignored. Is there an equivalent command for readLines? Alternatively, either immediately after reading into R or once the data set has been converted to a data frame, what is the appropriate command (or appropriate use of is.na) to convert my -99.99s to NAs? Thanks, Ben Osborne
Botany Department University of Vermont 109 Carrigan Drive Burlington, VT 05405 benjamin.osborne at uvm.edu phone: 802-656-0297 fax: 802-656-0440
Dear Ben, Since readLines() returns the lines in the file as character strings, it wouldn't be appropriate for it to substitute for missing values on input. One approach would be to replace "-99.99" with "NA" in the strings, but a simpler method would be to deal with the data frame (say DF): DF[DF == -99.99] <- NA (assuming that you've converted the strings to numeric values). I hope this helps, John On Tue, 1 Mar 2005 13:43:23 -0500
When reading a data set into R using readLines, na.strings="-99.99" is ignored. Is there an equivalent command for readLines? Alternatively, either immediately after reading into R or once the data set has been converted to a data frame, what is the appropriate command (or appropriate use of is.na) to convert my -99.99s to NAs? Thanks, Ben Osborne -- Botany Department University of Vermont 109 Carrigan Drive Burlington, VT 05405 benjamin.osborne at uvm.edu phone: 802-656-0297 fax: 802-656-0440
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-------------------------------- John Fox Department of Sociology McMaster University Hamilton, Ontario, Canada http://socserv.mcmaster.ca/jfox/