[R] better define: matrix comparison and cbind issue

[H. Paul Benton]

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

 


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