[R] better define: matrix comparison and cbind issue
jim holtman
jholtman at gmail.com
Thu Nov 30 03:18:49 CET 2006
Is this what you want?
> A <- read.table(textConnection("A v w x z
+ G x z y w
+ C y v z x
+ D x v w z
+ "), as.is=T)
>
> B <- read.table(textConnection("F z x y z
+ D x z w v
+ E x z w v
+ "), as.is=T)
>
> A
V1 V2 V3 V4 V5
1 A v w x z
2 G x z y w
3 C y v z x
4 D x v w z
> B
V1 V2 V3 V4 V5
1 F z x y z
2 D x z w v
3 E x z w v
> # create logical vector of matching values
> index <- is.na(match(A[,1], B[,1]))
>
> A[index,]
V1 V2 V3 V4 V5
1 A v w x z
2 G x z y w
3 C y v z x
>
>
>
>
>
On 11/29/06, H. Paul Benton <hpbenton at scripps.edu> wrote:
> Ok so something like this.
>
> A
> 1 2 3 4 5
> A v w x z
> G x z y w
> C y v z x
> D x v w z
>
> B
> 1 2 3 4 5
> F z x y z
> D x z w v
> E x z w v
>
> So here I would just be comparing col 1. I would compare A[1,] to B[1,] and
> then I would see that A[1,4] has the same element as B[1,2], so I would
> remove A[,4]. Making A:
> A
> 1 2 3 4 5
> A v w x z
> G x z y w
> C y v z x
>
> :)
>
> Cheers,
>
> Paul
>
> Research Technician
> Mass Spectrometry
> o The
> /
> o Scripps
> \
> o Research
> /
> o Institute
>
>
> -----Original Message-----
> From: Leeds, Mark (IED) [mailto:Mark.Leeds at morganstanley.com]
> Sent: Wednesday, November 29, 2006 2:19 PM
> To: H. Paul Benton
> Subject: RE: [R] better define: matrix comparison and cbind issue
>
> paul : it honestly might be me ( seriously ) but you say 6th and 9th
> column but then
> You say A[9,x] and B[9,x] which are all the elements in the 9th row of A
> and 9th row of B respectively.
>
> Could you make 2 small sample matrices and the result matrix and explain
> it that way ? Honestly though, someone
> else may understand so maybe wait to see if someone else responds with
> an answer/suggestion. Good luck.
>
>
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of H. Paul Benton
> Sent: Wednesday, November 29, 2006 5:09 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] better define: matrix comparison and cbind issue
>
> Hello,
>
> Sorry to all for the lack of communication, and thanks to those with the
> suggestions.
>
> So I have two matrixes which are different sizes, same column number but
> different row number.
>
> What I would like to do is to compare A to B. In the 6 and 9th column
> there are ref numbers (molecular masses to be exact). I would like to
> check A and B by these columns. If I find that the number in A[9,x] and
> B[9, x] are the same then I want to remove the row that it is comparing
> from A. So overall, if something appears in B then I remove it from A.
>
>
>
> Cheers,
>
>
>
> Paul
>
>
>
>
>
> Research Technician
>
> Mass Spectrometry
>
> o The
>
> /
>
> o Scripps
>
> \
>
> o Research
>
> /
>
> o Institute
>
>
>
>
> [[alternative HTML version deleted]]
>
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--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
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