[R] How can I create a data.table with 1000 variables (Var1:Var1000)

[arun]

Hi,

May be this helps:
 Large_Table<- data.frame(lapply(paste0("Var",1:1000),function(x) {x1<-data.frame(numeric());colnames(x1)<-x; x1}))
 str(Large_Table)
'data.frame':    0 obs. of  1000 variables:
 $ Var1   : num 
 $ Var2   : num 
----------------------------
A.K.



----- Original Message -----
From: Pooya Lalehzari <plalehzari at platinumlp.com>
To: arun <smartpink111 at yahoo.com>
Cc: "r-help at r-project.org" <r-help at r-project.org>
Sent: Thursday, August 15, 2013 5:09 PM
Subject: RE: [R] How can I create a data.table with 1000 variables (Var1:Var1000)

Here is the sample code.

Large_Table = data.frame( 
                  Var1=numeric(),
            Var2=numeric(),
            Var3=numeric(),
            .            
            .
            .
            Var1000=numeric())
Ideally, I would like to say 
Large_Table = data.frame( 
                  Var1-Var1000=numeric()
            )
Or maybe the answer is not to declare them and just create the variables as needed (i.e. in the for-loop that will use the data.frame.)


-----Original Message-----
From: arun [mailto:smartpink111 at yahoo.com] 
Sent: Thursday, August 15, 2013 5:04 PM
To: Pooya Lalehzari
Subject: Re: [R] How can I create a data.table with 1000 variables (Var1:Var1000)

This question is still not clear.  Could you show a reproducible example as to what you want?  In the title, it says to create 1000 variable and now your explanation is "refer".  Also, it is unclear as to what function in SAS you are referring to.  As Bert said, please follow the posting guide while posting.
Best.




----- Original Message -----
From: Pooya Lalehzari <plalehzari at platinumlp.com>
To: Bert Gunter <gunter.berton at gene.com>
Cc: "r-help at r-project.org" <r-help at r-project.org>
Sent: Thursday, August 15, 2013 4:27 PM
Subject: Re: [R] How can I create a data.table with 1000 variables (Var1:Var1000)

Sorry. data.table or even data.frame (as they are related). My question is, if there is a short form to refer to all 1000 of them similar to what exists in SAS.

Thank you,
Pooya Lalehzari.


-----Original Message-----
From: Bert Gunter [mailto:gunter.berton at gene.com]
Sent: Thursday, August 15, 2013 4:24 PM
To: Pooya Lalehzari
Cc: r-help at r-project.org
Subject: Re: [R] How can I create a data_table with 1000 variables (Var1:Var1000)

Please:

1. Define "data_table"  (??)

2. Follow the advice from the posting guide link below to post a coherent question.

-- Bert

On Thu, Aug 15, 2013 at 1:16 PM, Pooya Lalehzari <plalehzari at platinumlp.com> wrote:
> Hello everyone,
> How can I create a data_table with 1000 variables (Var1:Var1000)?
>
> Thank you,
> Pooya Lalehzari
>
>
>
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-- 

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm



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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.




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CONFIDENTIAL AND PRIVILEGED INFORMATION.ANY UNAUTHORIZED REVIEW, USE, DISCLOSURE
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