[R] specify the number of decimal numbers

[James W. MacDonald]

Wacek Kusnierczyk wrote:
> (Ted Harding) wrote:
>> On 14-May-09 12:27:40, Wacek Kusnierczyk wrote:
>>   
>>> ... but remember that sprintf introduces excel bugs into r (i.e.,
>>> rounding is not done according to the  IEC 60559 standard, see ?round):
>>>
>>>     ns = c(0.05, 0.15)
>>>     round(ns, 1)
>>>     # 0.0 0.2
>>>     as.numeric(sprintf('%.1f', ns))
>>>     # 0.1 0.1
>>> vQ
>>>     
>> True! And thanks for importing that point into the discussion.
>>   
> 
> said but true, true but sad.  i have already raised the issue on this
> list earlier, but to no response.  apparently, this sort of excel bug in
> r is an intentional feature, so you may not get it improved anytime
> soon.  unless you submit a patch and get it accepted, that is.

Have you brought this 'issue' up with the Perl people as well?

perl -e 'print sprintf("%.1f", 0.05) . "\n";'
0.1
perl -e 'print sprintf("%.1f", 0.15) . "\n";'
0.1


> 
> vQ
> 
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-- 
James W. MacDonald, M.S.
Biostatistician
Douglas Lab
University of Michigan
Department of Human Genetics
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