R help - May 2013 - Selecting several columns/rows of a dataframe?

Sorry, the use of rows/columns I found so far was rather
contradictive, both refering to what can be gotten via subset()
instead of what I'm looking for.
Is there a way to get multiple colums/rows? Something like
corpus.df${mph,mgl,eng}
Thanks in advance for any answers.
--
Joel Prokopchuk

Hi Joel,

I have no idea what you actually want, since there's no context in
your email, but you should probably see:
?"["
for information on how to subset a data frame by rows and/or columns
using either numerical indices or names (if appropriate for the
object).

Sarah

On Wed, May 1, 2013 at 4:04 PM, Joel Prokopchuk <joelproko at gmail.com>
wrote:
> Sorry, the use of rows/columns I found so far was rather
> contradictive, both refering to what can be gotten via subset()
> instead of what I'm looking for.
> Is there a way to get multiple colums/rows? Something like
> corpus.df${mph,mgl,eng}
> Thanks in advance for any answers.
> --
> Joel Prokopchuk
>
-- 
Sarah Goslee
http://www.functionaldiversity.org

Unless I have misinterpreted, your query indicates that you have made
no attempt to learn how R works. Try reading (relevant sections of)
"An Introduction to R" or other online R tutorials.

?"["

provides a terse but complete answer to your question, I believe.

-- Bert

On Wed, May 1, 2013 at 1:04 PM, Joel Prokopchuk <joelproko at gmail.com>
wrote:
> Sorry, the use of rows/columns I found so far was rather
> contradictive, both refering to what can be gotten via subset()
> instead of what I'm looking for.
> Is there a way to get multiple colums/rows? Something like
> corpus.df${mph,mgl,eng}
> Thanks in advance for any answers.
> --
> Joel Prokopchuk
>
> ______________________________________________
> R-help at r-project.org 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.


-- 

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

Hello,

Try

corpus.df[, c("mph", "mgl", "eng")]


Hope this helps,

Rui Barradas

Em 01-05-2013 21:04, Joel Prokopchuk escreveu:
> Sorry, the use of rows/columns I found so far was rather
> contradictive, both refering to what can be gotten via subset()
> instead of what I'm looking for.
> Is there a way to get multiple colums/rows? Something like
> corpus.df${mph,mgl,eng}
> Thanks in advance for any answers.
> --
> Joel Prokopchuk
>
> ______________________________________________
> R-help at r-project.org 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.
>

try tb[c('name1','name3'), c('col1','col5')]

Hong Qin

Sent from my iPad

On May 1, 2013, at 4:04 PM, Joel Prokopchuk <joelproko at gmail.com>
wrote:
> Sorry, the use of rows/columns I found so far was rather
> contradictive, both refering to what can be gotten via subset()
> instead of what I'm looking for.
> Is there a way to get multiple colums/rows? Something like
> corpus.df${mph,mgl,eng}
> Thanks in advance for any answers.
> --
> Joel Prokopchuk
> 
> ______________________________________________
> R-help at r-project.org 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.