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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