[R] Odp: Selecting data based on date-Data manupulation

[Petr PIKAL]

Hi

see ?format

output of format can be transferred to numeric and you can use logical 
operators to select only desired data.

x[as.numeric(format(x, "%Y")) > 2008,]

another option is to compare it to some date like

x > as.Date("2008-1-1")
this assumes that x has class "Date". If not you can change it by as.Date 
function.

Regards
Petr

r-help-bounces at r-project.org napsal dne 21.09.2009 07:55:57:

> 
> I have 70 columns and more than 400k rows .In the data date column will 
have
> values from 1900(01/01/1900) .How do i select only the data of recent 
two
> years?Help me in this regard
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