[R] How to get the date of specific value within a zoo object?

[R. Michael Weylandt <michael.weylandt@gmail.com>]

Xts is an extension of zoo that has some other nice features: character subsetting, periodic apply functions, good built in time conversions, etc. 

More importantly for my work, the authors put a lot of work into making sure it plays well with all of R's many ts classes so I almost always start any project by changing input from any source to xts so I don't have to think about the occasional inconsistencies. 

If you arent working with multiple data sources and don't need the extended functionality, there's absolutely nothing wrong with zoo - it's also a great package. 

Michael Weylandt

PS - more than anything, I was somewhat distracted when answering and couldn't get your code to work so I falsely assumed it was a zoo problem: so I just wrote an example I knew worked in xts - when I thought for a moment and saw your bug, I realized the same trick would work in zoo. 

On Aug 10, 2011, at 1:53 AM, Richard Ma <xuanlong.ma at uts.edu.au> wrote:

> Hi Michael,
> 
> Thanks for your kindly help. Problem solved!
> 
> Just curious why you prefer "xts" rather than "zoo"? Is "xts" more powerful?
> 
> BTW,  It's my mistake that incorrectly type the code. ;-)
> 
> Cheers,
> Richard
> 
> 
> R. Michael Weylandt <michael.weylandt at gmail.com> wrote:
>> 
>> I'd suggest you look into the xts class and write
>> 
>> require(xts)
>> xts = as.xts(1:5,Sys.Date()+1:5)
>> time(xts)[xts==3]
>> 
>> By the way, your code isn't pastable for me: not sure why.
>> 
>> Michael Weylandt
>> 
> 
> 
> -----
> Richard Ma
> PhD student, Ecology & Remote Sensing
> Climate Change Cluster, Department of Environment Science
> University of Technology, Sydney
> http://everydropr.wordpress.com
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