[R] How to export data with defined decimal places

[Bert Gunter]

Use format() or formatC() to convert your numeric data to character
and then "call write.table on that."

e.g.

> z <-formatC(pi,digits=10,format="f")
> z
[1] "3.1415926536"

If this still is not clear to you, I give up, as I do not know how to
make it any clearer. Perhaps someone else can.

-- Bert


On Thu, Mar 7, 2013 at 4:24 PM, Marino David <davidmarino838 at gmail.com> wrote:
> Hi Bert,
>
> I read both options and write.table help, but I still can't make it to save
> the data into txt file with fixed precision.
>
> To let you know more clearly what I want, I still you use the previous
> simple example to illustrate.
>
> I want to save pi into pi.txt file with 10 decimal places, that is
> 3.1415926536. How to do it?
>
>
>
> Thanks
>
> Marin
>
>
>
> 2013/3/8 Marino David <davidmarino838 at gmail.com>
>>
>> Hi Bert,
>>
>> I want to save the data into .txt file for another software process.
>>
>> Thanks for suggestion.
>>
>> 2013/3/8 Bert Gunter <gunter.berton at gene.com>
>>>
>>> ?write.table
>>>
>>> which says, under details:
>>>
>>> "In almost all cases the conversion of numeric quantities is governed
>>> by the option "scipen" (see options), but with the internal equivalent
>>> of digits=15. For finer control, use format to make a character
>>> matrix/data frame, and call write.table on that. "
>>>
>>> Not sure if this is what you want, as "export" is rather vague.
>>>
>>> -- Bert
>>>
>>> On Thu, Mar 7, 2013 at 12:52 PM, Marino David <davidmarino838 at gmail.com>
>>> wrote:
>>> > Hi all mailing listers,
>>> >
>>> > I want to export data with specified precision into .txt file. How can
>>> > I
>>> > make it? See  below
>>> >
>>> > sprintf("%.10f",pi)
>>> > [1] "3.1415926536"
>>> >
>>> > when carry out write.matrix(pi,"pi.txt"), 3.141592653589793115998 in
>>> > pi.txt
>>> > file not with 10 decimal places like using sprintf("%.10f",pi)
>>> >
>>> >
>>> > Thanks
>>> >
>>> > Marino
>>> >
>>> >         [[alternative HTML version deleted]]
>>> >
>>> > ______________________________________________
>>> > R-help at r-project.org mailing list
>>> > https://stat.ethz.ch/mailman/listinfo/r-help
>>> > PLEASE do read the posting guide
>>> > http://www.R-project.org/posting-guide.html
>>> > and provide commented, minimal, self-contained, reproducible code.
>>>
>>>
>>>
>>> --
>>>
>>> Bert Gunter
>>> Genentech Nonclinical Biostatistics
>>>
>>> Internal Contact Info:
>>> Phone: 467-7374
>>> Website:
>>>
>>> http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm
>>
>>
>



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm