[R] Help! What does this R command mean?

[Simon Blomberg]

RTFM! Especially the Introduction to R tutorial. Type help.start() at 
the prompt. It should open your web browser. Choose "Introduction to R". 
Only then will you attain enlightenment.

Simon.

Michael wrote:
> Hi all,
>
> R is so difficult. I am so desperate.
>
> What does the ":" mean in the following statement?
>
> What does the "[, -1]" mean?
>
>   
>> # Leaps takes a design matrix as argument: throw away the intercept
>> # column or leaps will complain
>>
>> X <- model.matrix(lm(V ~ I + D + W +G:I + P + N, election.table))[,-1]
>>     
>
> Thanks a lot!
>
> 	[[alternative HTML version deleted]]
>
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-- 
Simon Blomberg, B.Sc.(Hons.), Ph.D, M.App.Stat.
Centre for Resource and Environmental Studies
The Australian National University
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