I have a zoo object z

 z
           Value
2003-11-15  2.22
2003-11-17  2.26
2003-11-19  2.28
2003-11-22  2.54
2003-11-26  2.55

I wish to find the entry 2 entries before "2003-11-26".  How do I do this?

I thought I might be able to say index(z["2003-11-26"]) and have it return 5
so I could then say z[3].  But this does not work.

I can not find an answer in ?index

In the meantime I am using a loop, can any one help?

cheers
Worik

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