On Mar 16, 2011, at 17:37 , Yong Wang wrote:
hi, list
R is undoudtedly my favorite statistic tool, however, the data
inputnpart has long been a pain. most data I have to deal with are
irregular and contains special character.
Recently I get a tab delimited data, read.table(filename,sep=\t)
constantly return erors for certain rows does not has xyz elements
while all other programs such as perl,python, awk all report equal row
length if use \t as seperator.
I scout through the problematic row, sometimes it is because a row
contains a #, so I go back to specify comment.char=
next it will be some other problems, for some rows I simply can't
figure out what the problem is.
can I have any guru suggestion to save this pain now and in the
future, is CSV a safer format? or can anyone let me know what are the
fundamental principles I must bear in mind when do preliminary data
processing using other programs such as perl to ensure the output can
be readily feed into R.
A couple of other things can get messed up, e.g. quote symbols. Does
read.delim()/read.delim2() perhaps work better?
With CSV, you generally get the same sort of issues, just with , instead of
\t.
best
yong
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