Message-ID: <CAAmySGMPeoRei=C-uMFvw3pDJo_n7hvHGUQK3nCmBv4DAxNmow@mail.gmail.com>
Date: 2012-10-04T15:25:06Z
From: R. Michael Weylandt
Subject: convert multi dimensional array to list
In-Reply-To: <1349358869531-4645011.post@n4.nabble.com>
On Thu, Oct 4, 2012 at 2:54 PM, anto.r <anto.rajaa at gmail.com> wrote:
> I have an 4D named array (the result of recast() on a dataframe) and would
> like to convert it to a list with the names retained.
>
> Example:
>>my.df<-expand.grid(name=c("Alf","Que"), month=c("May","Jun"),
> year=c("2011","2012"))
>>my.df$tmax<-sample(15:20,4)
>>my.df$tmin<-sample(10:15,4)
>>my.df.melt=melt(my.df)
>>my.df.cast=cast(my.df.melt, year~name~month~variable)
>
> I want to convert it to a list so I can access the elements by name like
>>my.df.cast$tmax$May
> to get the corresponding year-name matrix
>
> This assuming, lists provide an easier way to handle this data. Does it?
I might actually stick with an array, but avoid the dollar sign syntax:
my.df.cast[,,"May",]
would be one way.
Cheers,
M
> Also, may be there is a way to get the list I want from my.df without going
> through the melt and cast. Any suggestions are welcome.
>
> Thanks in advance
> Anto
>
> PS: I came across threads for converting list to array but not the other way
> round.
>
>
>
> --
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