[R] character comp

[Rui Barradas]

After correcting the typo I tested both and yours is over twice as fast 
as mine.

Rui Barradas

Às 19:08 de 09/02/2019, Erin Hodgess escreveu:
> Nice, Rui!  Thanks
> 
> On Sat, Feb 9, 2019 at 11:55 AM Rui Barradas <ruipbarradas using sapo.pt 
> <mailto:ruipbarradas using sapo.pt>> wrote:
> 
>     Hello,
> 
>     The following will do it.
> 
>     mydataframe$dvar <- c(sapply(mydataframe[-1], nchar) %*% c(1, -1))
> 
> 
>     Hope this helps,
> 
>     Rui Barradas
> 
>     Às 18:05 de 09/02/2019, Val escreveu:
>      > Hi  All,
>      > In a given data frame I  want to compare character values of two
>     columns.
>      > My sample data looks like as follow,
>      >
>      > mydataframe <- read.table( text='ID  var1 var2
>      >    R1   AA  AAA
>      >    R2   AAA AAA
>      >    R3    A  AAAA
>      >    R4   AA   A
>      >    R5   A  AAA', header = TRUE, as.is <http://as.is> = TRUE )
>      >
>      > For each ID, I want  create the third column "dvar" as  difference
>      > between var1 and var2
>      >   Row1( R1)   the "dvar" value will be -1 and the complete 
>     desired out
>      > put looks like as follow.
>      >
>      >   ID    var1 var2   dvar
>      >   R1   AA    AAA    -1
>      >   R2  AAA  AAA      0
>      >   R3    A    AAAA    -3
>      >   R4   AA       A        1
>      >   R5    A     AAA      -2
>      >
>      > How do i do this? Any help please?
>      > Thank you
>      >
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> 
>     ______________________________________________
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> -- 
> Erin Hodgess, PhD
> mailto: erinm.hodgess using gmail.com <mailto:erinm.hodgess using gmail.com>