Thanks. I still didn't get the solution. For example, I have a data frame,
called temp
> temp
  Chr Ref Var     AFF    UNAFF AFF.test     pvalue
1  10   A   G  2/1/24    0/0/190        5/49  2.429e-09
2  18   G   A  1/9/17  0/23/167       11/43  2.484e-04
3   1   G   A  2/2/22    0/8/176         6/46  4.293e-04
4  11   T   G  1/1/25    0/2/188          3/51 1.193e-03
5   2   A   T 1/10/16   38/90/60       12/42  2.220e-03
6   3   G   A 1/16/10  8/49/133        18/36 4.549e-03

Then I want to write a csv file using R function write.csv, as follows:
> write.csv(temp, file="temp.csv", row.names = FALSE)

and the csv file, temp.csv, looks like the below, not same as original data
Chr    Ref    Var    AFF           UNAFF        AFF.test    pvalue
10        A    G    02/01/2024    0/0/190        May-49        2.43E-09
18        G    A    01/09/2017    0/23/167      Nov-43        0.0002484
1          G    A    02/02/2022    0/8/176        Jun-46        0.0004293
11         T    G    01/01/2025    0/2/188        Mar-51        0.001193
2          A    T    01/10/2016    38/90/60       Dec-42        0.00222
3          G    A    1/16/10        8/49/133       18/36          0.004549


On Fri, May 2, 2014 at 3:06 PM, Bert Gunter <gunter.berton@gene.com> wrote:

> Read your Excel documentation. AFAIK, R just writes text files -- you
> need to tell Excel how to read them in.
>
> Cheers,
> Bert
>
> Bert Gunter
> Genentech Nonclinical Biostatistics
> (650) 467-7374
>
> "Data is not information. Information is not knowledge. And knowledge
> is certainly not wisdom."
> H. Gilbert Welch
>
>
>
>
> On Fri, May 2, 2014 at 11:34 AM, ChangJiang Xu
> <changjiang.h.xu@gmail.com> wrote:
> > By dafault, write.csv will change the characters such as "5/38" as a date
> > "May-38". How can I not change the format?
> > Thanks.
> >
> > ChangJiang
> >
> >         [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@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.
>

	[[alternative HTML version deleted]]

