$dates))
> lapply(by.day,sum)
> }
>
> by.grp <- split(myframe,myframe$group)
> lapply(by.grp,sum.by.week)
>
> Martyn
>
> -Original Message-----
> From: Dimitri Liakhovitski [mailto:dimitri.liakhovit...@gmail.com]
> Sent: 30 March 2011 18:03
> To: Martyn Byng
> C
y.day,sum)
}
by.grp <- split(myframe,myframe$group)
lapply(by.grp,sum.by.week)
Martyn
-Original Message-
From: Dimitri Liakhovitski [mailto:dimitri.liakhovit...@gmail.com]
Sent: 30 March 2011 18:03
To: Martyn Byng
Cc: r-help
Subject: Re: [R] summing values by week - based on daily
;
> lapply(by.grp,sum.by.day)
>
>
> Martyn
>
> -Original Message-
> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org]
> On Behalf Of Dimitri Liakhovitski
> Sent: 30 March 2011 15:23
> To: r-help
> Subject: [R] summing values by week - based on da
boun...@r-project.org]
On Behalf Of Dimitri Liakhovitski
Sent: 30 March 2011 15:23
To: r-help
Subject: [R] summing values by week - based on daily dates - but with
somedates missing
Dear everybody,
I have the following challenge. I have a data set with 2 subgroups,
dates (days), and corresponding va
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