[R] 1.095e+09 for integers
Prof Brian Ripley
ripley at stats.ox.ac.uk
Mon Feb 23 08:08:29 CET 2009
I don't think you had 'integers' but integer-valued doubles: try
as.integer to get an integer variable. E.g.
x <- 1.1*(10^(1:8))
> write.table(data.frame(x, as.integer(x)), "")
"x" "as.integer.x."
"1" 11 11
"2" 110 110
"3" 1100 1100
"4" 11000 11000
"5" 110000 110000
"6" 1100000 1100000
"7" 1.1e+07 11000000
"8" 1.1e+08 110000000
Or see options(scipen=)
> options(scipen = 9)
> write.table(data.frame(x, as.integer(x)), "")
"x" "as.integer.x."
"1" 11 11
"2" 110 110
"3" 1100 1100
"4" 11000 11000
"5" 110000 110000
"6" 1100000 1100000
"7" 11000000 11000000
"8" 110000000 110000000
On Sun, 22 Feb 2009, Alexy Khrabrov wrote:
> I've had a very long file written out by R with write.table, with fields of
> time values, converted from POSIXlt as.numeric. Among 2.5 million values,
> very few had 6 trailing zeroes, and those were output in scientific notation
> as in the subject. Is this the default behavior for long integers, and how
> can it be turned off (with all digits for any integer field in write.table)?
They are already for integers: see above.
> This is important to interoperate with other languages through such text
> dumps, as some do not expect scientific notation for integers, only for
> floats.
But you almost certainly had 'floats' in R.
--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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