myDF <- data.frame(a = c("<0.1", NA, 0.3, 5, "Nil"),
b = c("<0.1", 1, 0.3, 5, "Nil"),
stringsAsFactors = FALSE)
# you can subset the b-column in several ways
myDF[ , 2]
myDF[ , "b"]
myDF$b
# using the column, you make a logical vector
! is.na(as.numeric(myDF$b))
# This can be used to select the rows you want
myDF[! is.na(as.numeric(myDF$b)), ]
B.
> On Sep 25, 2017, at 7:30 AM, Shane Carey <careys...@gmail.com> wrote:
>
> Hi,
>
> Lets say this was a dataframe where I had two columns
>
> a <- c("<0.1", NA, 0.3, 5, "Nil")
> b <- c("<0.1", 1, 0.3, 5, "Nil")
>
> And I just want to remove the rows from the dataframe where there were NAs in
> the b column, what is the syntax for doing that?
>
> Thanks in advance
>
> On Fri, Sep 22, 2017 at 5:04 PM, Shane Carey <careys...@gmail.com> wrote:
> Super,
>
> Thanks
>
> On Fri, Sep 22, 2017 at 4:57 PM, Boris Steipe <boris.ste...@utoronto.ca>
> wrote:
> > a <- c("<0.1", NA, 0.3, 5, "Nil")
> > a
> [1] "<0.1" NA "0.3" "5" "Nil"
>
> > b <- as.numeric(a)
> Warning message:
> NAs introduced by coercion
> > b
> [1] NA NA 0.3 5.0 NA
>
> > b[! is.na(b)]
> [1] 0.3 5.0
>
>
> B.
>
>
> > On Sep 22, 2017, at 11:48 AM, Shane Carey <careys...@gmail.com> wrote:
> >
> > Hi,
> >
> > How do I extract just numbers from the following list:
> >
> > a=c("<0.1",NA,0.3,5,Nil)
> >
> > so I want to obtain: 0.3 and 5 from the above list
> >
> > Thanks
> >
> >
> > --
> > Le gach dea ghui,
> > *Shane Carey*
> > *GIS and Data Solutions Consultant*
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> > 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.
>
>
>
>
> --
> Le gach dea ghui,
> Shane Carey
> GIS and Data Solutions Consultant
>
>
>
> --
> Le gach dea ghui,
> Shane Carey
> GIS and Data Solutions Consultant
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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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.
