[R] create

Bert Gunter
Sun, 14 Apr 2019 03:16:09 -0000

If the NA's are really 0's, replace them with 0 before doing the
calculation. (see ?is.na).
If they are not 0's, think again about doing this as the results would
probably mislead.

Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Sat, Apr 13, 2019 at 7:54 PM Val <valkremk at gmail.com> wrote:

> Hi All,
> I have a data frame  with several  columns  and I want to  create
> another  column  by using  the values of the other columns.  My
> problem is that some the row values  for some columns  have missing
> values  and I could not get  the result I waned .
>
> Here is the sample of my data and my attempt.
>
> vdat<-read.table(text="obs, Year, x1, x2, x3
> 1,  2001, 25 ,10, 10
> 2,  2001,  ,  15, 25
> 3,  2001,  50, 10,
> 4,  2001,  20, , 60",sep=",",header=TRUE,stringsAsFactors=F)
> vdat$xy <- 0
> vdat$xy <- 2*(vdat$x1) + 5*(vdat$x2) + 3*(vdat$x3)
> vdat
>
>      obs Year x1 x2 x3  xy
> 1   1 2001 25 10 10 130
> 2   2 2001 NA 15 25  NA
> 3   3 2001 50 10 NA  NA
> 4   4 2001 20 NA 60  NA
>
> The desired result si this,
>
>    obs Year x1 x2 x3   xy
> 1   1 2001 25 10 10   130
> 2   2 2001 NA 15 25  150
> 3   3 2001 50 10 NA  150
> 4   4 2001 20 NA 60  220
>
> How do I get my desired result?
> Thank you
>
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