On 02.08.2013 05:29, Babu Guha wrote:
I have a comma delimited file with 62 fields of which some are comments.
There are about 1.5 million records/lines. Sme of the fields which has
comments and which i do not need have 40 characters. Of the 62 fields, I
will need at most 12 fields. What's best way to read in the fields I need.
If I read the entire file at once I will run out of memory. Could anyone
please suggest some solution?
See ?read.table and its argument colClasses:
read.table(file, colClasses=c("numeric", "NULL", "factor"))
Will read the first column as a numeric one, skip the second column and
take the thirs one as a factor.
Best,
Uwe Ligges
Thanks,
Babu.
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