[R] Extract row as NA with no matching name

PIKAL Petr petr@p|k@| @end|ng |rom prechez@@cz
Fri Aug 9 08:12:06 CEST 2019


Hi

Do you insist to use matrix?

If you change matrix to data frame it returns NA as required.

mdat
     C.1 C.2 C.3
row1   1   2   3
row2  11  12  13
> mdat["some",]
Error in mdat["some", ] : subscript out of bounds
> mdatf<-as.data.frame(mdat)
> mdatf["some",]
   C.1 C.2 C.3
NA  NA  NA  NA

Cheers
Petr

> -----Original Message-----
> From: R-help <r-help-bounces using r-project.org> On Behalf Of Christofer Bogaso
> Sent: Thursday, August 8, 2019 5:44 PM
> To: r-help <r-help using r-project.org>
> Subject: [R] Extract row as NA with no matching name
>
> Hi,
>
> Let say I have below matrix
>
> mdat <- matrix(c(1,2,3, 11,12,13), nrow = 2, ncol = 3, byrow = TRUE,
>                dimnames = list(c("row1", "row2"),
>                                c("C.1", "C.2", "C.3")))
>
>
> Now I can extract a raw by rowname as
>
> > mdat['row1', ]
>
> C.1 C.2 C.3
>
>   1   2   3
>
>
> However I am also looking for was to extract values as NA when a rowname is
> supplied which is not existing rownames
>
> I should get
>
> > mdat['new_raw', ]
>
> C.1 C.2 C.3
>
>   NA   NA   NA
>
>
> Current it throws error as default functionality. Is there any way to force R to
> provide values as NA instead of showing any errore?
>
> [[alternative HTML version deleted]]
>
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