[R] Obtain a list of data tables from a main data table

[Jeff Newmiller]

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I thought the whole purpose of data.table was to allow group data processing without creating oodles of separate tables.

What is your intended use of ask if these tables?
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On October 8, 2014 9:06:30 AM MDT, "Frank S." <f_j_rod at hotmail.com> wrote:
> 
>
>Hi everybody,
>
> 
>
>I have (as an example) the following
>two data tables:
>
> 
>
>all <-
>data.table(ID = c(rep(c(100:105),c(3,2,2,3,3,3))),
>
>     value =
>c(100,120,110,90,45,35,270,50,65,40,25,55,75,30,95,70))
>
>DT <-
>data.table(ID = 100:105, code=c(2,1,3,2,3,1))
>
> 
>
>My aim is to construct as many sub data tables as different values for
>the integer variable code, and I have
>done:
>
>code_1
><- all[ID %in% DT[code==1]$ID] 
>
>code_2
><- all[ID %in% DT[code==2]$ID] 
>
>code_3
><- all[ID %in% DT[code==3]$ID] 
>
> 
>
>Because maximum code value can be very
>high, �is it possible to obtain a list of the above 3 data tables
>through a
>loop? I mean something like:
>
> 
>
>for (i in
>1:max(DT$code)){
>
>  paste(code,�_�,[i]) <- }
>
>return(list)]
>
> 
>
>Thank
>you very much to all the members!
>
> 		 	   		  
>	[[alternative HTML version deleted]]
>
>
>
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>
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