Without example code or data I can't guarantee this is your problem, but
have you looked at using xts(...,unique = F) instead of the default true.

Alternatively, let us see what your data actually looks like to R (dput) and
we'll help. But what you've got sounds like a problem in the date format,
which is a little hard to see without knowing the exact way it's appearing
in R.

Michael

On Mon, Aug 22, 2011 at 7:46 PM, Muhammad Abuizzah <izzah100@yahoo.com>wrote:

> I read enourmous comment about this questions stating that it was answered
> before.
> I have been looking for the answer for a week without luck !!!
> I searched the archives the xts. vignitte , googled for an answer but
> couldn't find one so her it is:
>
> the Vignette states that xts "doesn't inforce the duplicate row
> requirement" but yet when I try to bring in tick stock data from a data
> frame as.xts it complains that the string is in an ambigious format.
>
> The date and time were in two separate columns I corrected that using excel
> and put them both in one column and saved the file as a text file in which
> the first column became similar to the example below.  tried to read the
> table directly, didn't work, I brought in the data as a data.frame() then
> tried to convert it, that didn't work either
>
> bellow is an example of how my data looks it has more than 2 columns, but
> the important column is the first one,  the second column "xxx" is price:
>
> 2011-02-10 12:21:05     xxx
> 2011-02-10 12:21:05     xxx
>
> Then I found out that zoo would allow me to bring the data in with the
> duplicates it will ask you to fix it but atleast I would havce a zoo
> object.  I thought I could trick it this way by bring it as zoo, then
> convert it to xts with the as.xts function      that didn't work either
>
> I read a solution about using make.unique function I tried it with the code
> bellow, that didn't work
>
> aapl<- make.index.unique(as.xts(read.table("C:\\Data
> Files\\new\\aapl.txt")))
>
> part of the confusion with the "unique" function was should I wrape the xts
> object with it or should I wrap it (unique) within the xts, I didn't know
> the order so I tried both, and neithe worked
>
> So I gave up !!How can I bring in a txt file into R as an xts object when I
> have duplicate rows on seconds knowing I dont have fractions of seconds? Do
> we have to use the unique function or is it true that xts doesn't enforce
> the unique date requirement?
>
> Please provide code example based on the code line in blue and (aapl stock
> data) and date format above.
>
> Thanks in advance
>
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