R help - Mar 2007 - How to drop variables using a wildcard and logic...

Dear R users

I would like to make a new dataframe  from an existing dataframe, retaining
ONLY those variables that end in the letter "t"

I have searched the help archives and consulted several reference books but
cannot seem to find an example.

Any ideas...? Thanks!

Mark

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if 'test' is your data frame...

test[, grep("[tT]$", names(test))]

b

On Mar 26, 2007, at 3:06 PM, mtb954 at gmail.com wrote:
> Dear R users
>
> I would like to make a new dataframe  from an existing dataframe,  
> retaining
> ONLY those variables that end in the letter "t"
>
> I have searched the help archives and consulted several reference  
> books but
> cannot seem to find an example.
>
> Any ideas...? Thanks!
>
> Mark
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting- 
> guide.html
> and provide commented, minimal, self-contained, reproducible code.

Thanks Phil and Benilton!
Mark

On 3/26/07, mtb954@gmail.com <mtb954@gmail.com>
wrote:
>
> Dear R users
>
> I would like to make a new dataframe  from an existing dataframe,
> retaining ONLY those variables that end in the letter "t"
>
> I have searched the help archives and consulted several reference books
> but cannot seem to find an example.
>
> Any ideas...? Thanks!
>
> Mark
>
	[[alternative HTML version deleted]]