[R] convert multi dimensional array to list

[anto.r]

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?
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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