[R] 1.095e+09 for integers

[Prof Brian Ripley]

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