How to export data with defined decimal places

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]]

z <-formatC(pi,digits=10,format="f")
z

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]]

--

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