search for: dayalu

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2009 Jul 22
1
Problem with "merge" command duplicating values
Hello, I am attempting to merge 8 different data sets into a "grand merge" data set; all their variable names are common except for the the gas measured. However, when I did a quick stat summary comparison of merged data with unmerged data, it turned out that R mysteriously duplicated thousands of values in the merged set and I have no idea why. I've not had this problem with merge
2010 Aug 05
1
difficulties with read.table applied to files from URL
Hello, I am using read.table to read files directly from a public ftp site. I have a general list of files that may or may not exist in the ftp directory, but my hope was that R would read the file if it existed and ignored it if it didn't exist and move on to the next one. However, when R arrives at a file that does not exist I get the error message "Error in file(file, "rt") :