[datatable-help] Apparent loss of decimals when reading a numeric column with fread() !

[Bacou, Melanie]

In case that happens to others. Seems related to R global `digits` 
options, maybe something changed in R.3.2.1.
--Mel.

```
options(digits=3)
1000-0.5
# [1] 1000
options(digits=5)
1000-0.5

# [1] 999.5

```

On 8/4/2015 7:54 AM, Bacou, Melanie wrote:
> Hi,
> Thx, I see I have another problem, not related to data.table (sorry). 
> R seems to truncate numbers in the console. Not sure what's going on.
>
> --Mel.
>
> ```{r}
> > 1-0.5
> [1] 0.5
> > 2008-0.05
> [1] 2008
> > 45-0.5
> [1] 44.5
> > 100-0.5
> [1] 99.5
> > 1000-0.5
> [1] 1000
> > 10000-0.5
> [1] 10000
> ```
>
> On 8/4/2015 7:16 AM, nachti wrote:
>> Hi,
>> copying your code, everything works as expected for me.
>> Maybe you just referenced to a wrong object (pcn08)?
>>
>> ```
>>> library(data.table)
>> data.table 1.9.4  For help type: ?data.table
>> *** NB: by=.EACHI is now explicit. See README to restore previous 
>> behaviour.
>>> pcn <- fread("PovCalServlet_15.08.03.csv")
>> sapply(pcn, class)
>> pcn <- fread("PovCalServlet_15.08.03.csv")
>>> sapply(pcn, class)
>>      country     povLine        mean         hcr gap         sev
>> "character"   "numeric"   "numeric"   "numeric"   "numeric" "numeric"
>>        watts        popM     yearNum
>>    "numeric"   "numeric"   "numeric"
>>> pcn08$yearNum
>> Error: object 'pcn08' not found
>>> pcn$yearNum
>>   [1] 2008.50 2011.50 2009.25 2009.00 2006.00 2007.50 2007.00 2008.00 
>> 2011.00
>> [10] 2004.00 2005.50 2011.00 2008.00 2010.50 2005.00 2003.00 2005.50 
>> 2008.00
>> [19] 2007.00 2012.00 2002.00 2005.40 2010.00 2007.00 2010.00 2010.23 
>> 2010.00
>> [28] 2008.00 2008.00 2012.00 2006.00 2008.64 2009.50 2011.00 2009.83 
>> 2010.83
>> [37] 2010.00 2011.00 2006.50 2011.00 2010.67 2009.00 2009.50 2011.80 
>> 2011.00
>> [46] 2008.00 2012.50 2009.30 2010.00 2008.50 2011.50 2009.25 2009.00 
>> 2006.00
>> [55] 2007.50 2007.00 2008.00 2011.00 2004.00 2005.50 2011.00 2008.00 
>> 2010.50
>> [64] 2005.00 2003.00 2005.50 2008.00 2007.00 2012.00 2002.00 2005.40 
>> 2010.00
>> [73] 2007.00 2010.00 2010.23 2010.00 2008.00 2008.00 2012.00 2006.00 
>> 2008.64
>> [82] 2009.50 2011.00 2009.83 2010.83 2010.00 2011.00 2006.50 2011.00 
>> 2010.67
>> [91] 2009.00 2009.50 2011.80 2011.00 2008.00 2012.50 2009.30 2010.00
>>> sessionInfo()
>> R version 3.2.1 (2015-06-18)
>> Platform: x86_64-suse-linux-gnu (64-bit)
>> Running under: openSUSE 13.1 (Bottle) (x86_64)
>>
>> locale:
>>   [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
>>   [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8
>>   [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8
>>   [7] LC_PAPER=en_US.UTF-8       LC_NAME=C
>>   [9] LC_ADDRESS=C               LC_TELEPHONE=C
>> [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
>>
>> attached base packages:
>> [1] stats     graphics  grDevices utils     datasets  methods base
>>
>> other attached packages:
>> [1] data.table_1.9.4
>>
>> loaded via a namespace (and not attached):
>> [1] compiler_3.2.1 magrittr_1.5   plyr_1.8.3     tools_3.2.1
>> reshape2_1.4.1
>> [6] Rcpp_0.11.6    stringi_0.5-5  stringr_1.0.0  chron_2.3-4
>> ```
>>
>> ~g
>>
>>
>>
>> -- 
>> View this message in context: 
>> http://r.789695.n4.nabble.com/Apparent-loss-of-decimals-when-reading-a-numeric-column-with-fread-tp4710722p4710727.html
>> Sent from the datatable-help mailing list archive at Nabble.com.
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