Message-ID: <366c6f341001011342s4c1a9f72g5787635435f4eb89@mail.gmail.com>
Date: 2010-01-01T21:42:17Z
From: Peng Yu
Subject: How to not to terminate read.table if the input file is empty?
In-Reply-To: <366c6f341001011319o1a867b5do8d692916514112fe@mail.gmail.com>
On Fri, Jan 1, 2010 at 3:19 PM, Peng Yu <pengyu.ut at gmail.com> wrote:
> On Fri, Jan 1, 2010 at 2:54 PM, Dylan Beaudette
> <dylan.beaudette at gmail.com> wrote:
>> ?try
>
> This works. Thank you!
>
>> f=try(read.table("empty_data.txt"))
> Error in read.table("empty_data.txt") : no lines available in input
One more question. Is there a way to suppress the output to the screen
'Error in read.table("empty_data.txt") : no lines available in input'?
>> if(class(f)=='try-error') {
> + ? f=NULL
> + }
>> print(f)
> NULL
>> g=try(read.table("data.txt"))
>> print(g)
> ? ?V1 ? ? V2 ? ? V3 ? ? V4
> 1 name title1 title2 title3
> 2 row1 ? 10.1 ? 20.1 ? 30.1
> 3 row2 ? 12.1 ? 22.1 ? 32.1
>>
>
>
>> On Fri, Jan 1, 2010 at 12:41 PM, Peng Yu <pengyu.ut at gmail.com> 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
>>>
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>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>>>
>>
>