On 01-Jan-10 20:41:52, Peng Yu wrote:
> read.table terminates the program if the input file is empty. Is there
> way to let the program continue and return me a NULL instead of
> terminating the program?
>
> $ Rscript read_empty.R
>> read.table("empty_data.txt")
> Error in read.table("empty_data.txt") : no lines available in input
> Execution halted
> $ cat read_empty.R
> read.table("empty_data.txt")
> $ cat empty_data.txt; echo EOF
> EOF
If I understand the point of your query correctly, the following,
from "?read.table", would be relevant:
Value:
A data frame (?data.frame?) containing a representation of the
data in the file.
Empty input is an error unless "col.names" is specified, when a
0-row data frame is returned: similarly giving just a header line
if "header = TRUE" results in a 0-row data frame. Note that in
either case the columns will logical unless ?colClasses? was
supplied.
The result would not be NULL, but can be tested for zero rows.
Hoping this helps,
Ted.
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E-Mail: (Ted Harding) <[email protected]>
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Date: 01-Jan-10 Time: 20:55:35
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