[R] Different way of aggregating

[skan]

Phil Spector wrote:
> 
> 
> For chron objects:
> 
>   aggregate(thedata$value,list(hour=hours(thedata$date)),mean)
> 
> 


Ok, thanks, that's what I need. Now it seems so easy...

Could you tell me why we write... ?
 aggregate(thedata$value,list(hour=hours(thedata$date)),mean)
instead of just
 aggregate(thedata$value,hours(thedata$date),mean)

thanks

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