(Re-)read the discussion of indexing (both `[` and `[[`) and be sure to get
clear on the difference between matrices and data frames in the Introduction to
R document that comes with R. There are many ways to create numeric vectors,
character vectors, and logical vectors that can then be used as indexes,
including the straightforward way:
df[ c(
"Unique to strat ",
"Unique to strat:crt.dummy ",
"Common to strat, and crt.dummy ",
"Common to strat, and gender ",
"Common to strat, and age ") ,]
--
Sent from my phone. Please excuse my brevity.
On October 19, 2017 3:14:53 AM PDT, Francesca PANCOTTO <f.panco...@unimore.it>
wrote:
>Thanks a lot, so simple so efficient!
>
>I will study more the grep command I did not know.
>
>Thanks!
>
>
>Francesca Pancotto
>
>> Il giorno 19 ott 2017, alle ore 12:12, Enrico Schumann
><e...@enricoschumann.net> ha scritto:
>>
>> df[grep("strat", row.names(df)), ]
>
>
> [[alternative HTML version deleted]]
>
>______________________________________________
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>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.
______________________________________________
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and provide commented, minimal, self-contained, reproducible code.
