Stephane DRAY wrote:
>
> Hello list,
> I have used scan function to import data into R. I have done some analysis
> and find strange results. I have found my problem : when importing data
> with scan, this can slightly modify the data :
>
> > write(c(0.251,3.399,-0.481,0.266),"essai.txt")
> > scan("essai.txt")
> Read 4 items
> [1] 0.251 3.399 -0.481 0.266
> > print(scan("essai.txt"),17)
> Read 4 items
> [1] 0.25100000000000000 3.39900000000000000
> -0.48099999999999998 0.26600000000000001
>
> Is it normal ? Is it a bug ?
It is normal, that there are no exact representations for floating point
numbers in a computer (you have only a limited number of bits to
represent them!).
In this case, it is not scan(), but just the representation: Try out and
type
print(c(0.251,3.399,-0.481,0.266), 17)
Uwe Ligges
> thanks in advance,
> Sincerely.
>
> > version
> _
> platform i386-pc-mingw32
> arch i386
> os mingw32
> system i386, mingw32
> status
> major 1
> minor 8.1
> year 2003
> month 11
> day 21
> language R
> Stéphane DRAY
> --------------------------------------------------------------------------------------------------
>
> Département des Sciences Biologiques
> Université de Montréal, C.P. 6128, succursale centre-ville
> Montréal, Québec H3C 3J7, Canada
>
> Tel : 514 343 6111 poste 1233
> E-mail : [EMAIL PROTECTED]
> --------------------------------------------------------------------------------------------------
>
> Web http://www.steph280.freesurf.fr/
>
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