R help - Sep 2007 - Storing Variables of different types

Hi there,

I have an ixjxk array where I want to store dates in the first column of
all sub-matrices (i.e. j=1 is a column with dates) and real numbers in
the rest of the columns.......I have been trying many things, but I am
not getting anywhere. 

Thank you very much for your help,

Fabian


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Garavito,Fabian a ?crit :
> Hi there,
> I have an ixjxk array where I want to store dates in the first column of
> all sub-matrices (i.e. j=1 is a column with dates) and real numbers in
> the rest of the columns.......I have been trying many things, but I am
> not getting anywhere. 
> Thank you very much for your help,
> Fabian
?data.frame
or think about storing dates in the rownames.

One technique that I use (with POSIXct dates) is to convert the date
to numeric so that it can be stored in an array (which must have the
same mode for all variables) and then when I need it, just convert it
back as needed.  Here is an example:
> x <- as.POSIXct("2007-09-15 13:25")
> x
[1] "2007-09-15 13:25:00 GMT"
> x.numeric <- unclass(x)
> x.numeric
[1] 1189862700
attr(,"tzone")
[1] ""
> # back to POSIXct
> x.POSIXct <- ISOdate(1970,1,1,0) + x.numeric
> x.POSIXct
[1] "2007-09-15 13:25:00 GMT"
> # or you can just change the class
> structure(x.numeric, class=c("POSIXt", "POSIXct"))
[1] "2007-09-15 13:25:00 GMT"
>

On 9/14/07, Garavito,Fabian <fgaravito at guggenheimadvisors.com>
wrote:
>
> Hi there,
>
> I have an ixjxk array where I want to store dates in the first column of
> all sub-matrices (i.e. j=1 is a column with dates) and real numbers in
> the rest of the columns.......I have been trying many things, but I am
> not getting anywhere.
>
> Thank you very much for your help,
>
> Fabian
>
>
> This message and any attachment are confidential and may be privileged or
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contained in the attached email shall be deemed to be an advise of, or
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contained in the attached email.
>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

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