[R] strangely long floating point with write.table()

[Jeff Newmiller]

Attaching RData files is unfortunately not supported.

Try reading [1] and using dput to share your reproducible data.

[1] http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example
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Sent from my phone. Please excuse my brevity.

On March 14, 2014 8:03:50 PM PDT, Mike Miller <mbmiller+l at gmail.com> wrote:
>On Fri, 14 Mar 2014, Duncan Murdoch wrote:
>
>> On 14-03-14 8:59 PM, Mike Miller wrote:
>>> What I'm using:
>>> 
>>> R version 3.0.1 (2013-05-16) -- "Good Sport"
>>> Copyright (C) 2013 The R Foundation for Statistical Computing
>>> Platform: x86_64-unknown-linux-gnu (64-bit)
>>
>> That's not current, but it's not very old...
>>
>>> According to some docs, options(digits) controls numerical precision
>in 
>>> output of write.table().  I'm using the default value for digits:
>>> 
>>>> getOption("digits")
>>> [1] 7
>>> 
>>> I have a bunch of numbers in a data frame that are only a few digits
>to 
>>> the right of the decimal:
>>
>> That's not enough to reproduce this.  Put together a self-contained 
>> reproducible example if you're wondering why something behaves as it 
>> does. With just a bunch of output, you'll just get uninformed
>guesses.
>
>
>Thanks for the tip.  Here's what I've done:
>
>> data2 <- data[c(94,120),c(18,20,21)]
>> save(data2, file="data2.Rdata")
>> q("no")
>
>$ R
>> load("data2.Rdata")
>> data2
>       V18   V20      V21
>94  0.008 0.008 0.000064
>120 0.023 0.023 0.000529
>> write.table(data2, file="data2.txt", sep="\t", row.names=F,
>col.names=F)
>
>$ cat data2.txt
>0.00800000000000001     0.00800000000000001     6.40000000000001e-05
>0.0229999999999999      0.0229999999999999      0.000528999999999996
>
>The data2.Rdata file is attached to this message.
>
>I guess that is enough to reproduce this exact finding.  I don't know
>how 
>it works in general.
>
>I don't have a newer version of R available right now.  It did the same
>
>thing on an older version (2.15.1).
>
>Interestingly, on a different machine with an even older version
>(2.12.2) 
>I see something a little different:
>
>0.008   0.008   6.40000000000001e-05
>0.0229999999999999      0.0229999999999999      0.000528999999999996
>
>Best,
>Mike
>
>------------------------------------------------------------------------
>
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