[R] dataframe: how to select an element from a row

[ikuzar]

Hi, 
I 'd like to select the Date where myvalue =1800 appears the* first time*.

For instance:
df =data.frame(date, myvalue, ...)

...

Date                            myvalue
2012-01-05                2500                
2012-01-06               2450
*2012-01-07               1800*
2012-01-08                2200
2012-01-09                1800

I'd like to retrieve the third line.

I do not find a clean way.

Thanks for your help



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