R help - May 2014 - Return "TRUE" only for first match of values between matrix and vector.

I wish to return " True" in a matrix for only the first match of a
value
per row where the value equals that in a vector with the same number of
values as rosw in the matrix

eg:
A<-matrix(c(2,3,2,1,1,2,NA,NA,NA,5,1,0,5,5,5),5,3)
B<-c(2,1,NA,1,5)
desired result:

      [,1] [,2]  [,3]
[1,]  TRUE FALSE FALSE
[2,] FALSE   NA FALSE
[3,]    NA   NA    NA
[4,]  TRUE   NA FALSE
[5,] FALSE TRUE  FALSE

however A==B returns:
      [,1] [,2]  [,3]
[1,]  TRUE TRUE FALSE
[2,] FALSE   NA FALSE
[3,]    NA   NA    NA
[4,]  TRUE   NA FALSE
[5,] FALSE TRUE  TRUE
and
apply(A,1,function(x) match (B,x))
returns
     [,1] [,2] [,3] [,4] [,5]
[1,]    1   NA    1   NA   NA
[2,]    3   NA   NA    1    1
[3,]   NA    2    2    2   NA
[4,]    3   NA   NA    1    1
[5,]   NA   NA    3    3    2

thanks

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Hi,
Try:
indx <- A==B
t(apply(indx,1,function(x) {x[duplicated(x) & !is.na(x)] <- FALSE; x}))
#????? [,1]? [,2]? [,3]
#[1,]? TRUE FALSE FALSE
#[2,] FALSE??? NA FALSE
#[3,]??? NA??? NA??? NA
#[4,]? TRUE??? NA FALSE
#[5,] FALSE? TRUE FALSE

A.K.




On Friday, May 2, 2014 4:47 AM, nevil amos <nevil.amos at gmail.com>
wrote:
I wish to return " True" in a matrix for only the first match of a
value
per row where the value equals that in a vector with the same number of
values as rosw in the matrix

eg:
A<-matrix(c(2,3,2,1,1,2,NA,NA,NA,5,1,0,5,5,5),5,3)
B<-c(2,1,NA,1,5)
desired result:

? ? ? [,1] [,2]? [,3]
[1,]? TRUE FALSE FALSE
[2,] FALSE?  NA FALSE
[3,]? ? NA?  NA? ? NA
[4,]? TRUE?  NA FALSE
[5,] FALSE TRUE? FALSE

however A==B returns:
? ? ? [,1] [,2]? [,3]
[1,]? TRUE TRUE FALSE
[2,] FALSE?  NA FALSE
[3,]? ? NA?  NA? ? NA
[4,]? TRUE?  NA FALSE
[5,] FALSE TRUE? TRUE
and
apply(A,1,function(x) match (B,x))
returns
? ?  [,1] [,2] [,3] [,4] [,5]
[1,]? ? 1?  NA? ? 1?  NA?  NA
[2,]? ? 3?  NA?  NA? ? 1? ? 1
[3,]?  NA? ? 2? ? 2? ? 2?  NA
[4,]? ? 3?  NA?  NA? ? 1? ? 1
[5,]?  NA?  NA? ? 3? ? 3? ? 2

thanks

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______________________________________________
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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.

Hi Nevil,

Try

apply(A, 2, function(x) x == B)

HTH,
Jorge.-



On Fri, May 2, 2014 at 6:46 PM, nevil amos <nevil.amos@gmail.com> wrote:
> I wish to return " True" in a matrix for only the first match of
a value
> per row where the value equals that in a vector with the same number of
> values as rosw in the matrix
>
> eg:
> A<-matrix(c(2,3,2,1,1,2,NA,NA,NA,5,1,0,5,5,5),5,3)
> B<-c(2,1,NA,1,5)
> desired result:
>
>       [,1] [,2]  [,3]
> [1,]  TRUE FALSE FALSE
> [2,] FALSE   NA FALSE
> [3,]    NA   NA    NA
> [4,]  TRUE   NA FALSE
> [5,] FALSE TRUE  FALSE
>
> however A==B returns:
>       [,1] [,2]  [,3]
> [1,]  TRUE TRUE FALSE
> [2,] FALSE   NA FALSE
> [3,]    NA   NA    NA
> [4,]  TRUE   NA FALSE
> [5,] FALSE TRUE  TRUE
> and
> apply(A,1,function(x) match (B,x))
> returns
>      [,1] [,2] [,3] [,4] [,5]
> [1,]    1   NA    1   NA   NA
> [2,]    3   NA   NA    1    1
> [3,]   NA    2    2    2   NA
> [4,]    3   NA   NA    1    1
> [5,]   NA   NA    3    3    2
>
> thanks
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> 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.
>
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