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Georg Otto

2005-Nov-28 17:47 UTC

[R] combine two columns

Hi,

I have an R programming problem and I havent found anything in the
documentation yet:

I have a data matrix, in which two neighbouring columns represent
replicates of the same experiment, e.g. something like this:

       A A B B C C
row1   1 1 1 2 2 2
row2   1 1 1 1 1 2

I would like to test, if the values for the two replicates in a row
are the same or if they differ and generate a new matrix with the
results of the tests, something like this:

        A B C
row1    T F T
row2    T T F

Any hint will be appreciated!

Georg

Sean Davis

2005-Nov-29 13:34 UTC

head link

[R] combine two columns

On 11/28/05 12:47 PM, "Georg Otto" <georg.otto at
tuebingen.mpg.de> wrote:
> Hi,
> 
> I have an R programming problem and I havent found anything in the
> documentation yet:
> 
> I have a data matrix, in which two neighbouring columns represent
> replicates of the same experiment, e.g. something like this:
> 
>      A A B B C C
> row1   1 1 1 2 2 2
> row2   1 1 1 1 1 2
> 
> I would like to test, if the values for the two replicates in a row
> are the same or if they differ and generate a new matrix with the
> results of the tests, something like this:
> 
>       A B C
> row1    T F T
> row2    T T F
> 
> Any hint will be appreciated!
 x <- matrix(c(1,1,1,2,2,2,1,1,1,1,1,2),nr=2,byrow=TRUE)
 colnames(x) <-
c('A','A','B','B','C','C')
 aggregate(t(x),by=list(colnames(x)),function(y) {length(unique(y))==1})

This should be close, I think.

Sean

TEMPL Matthias

2005-Nov-29 13:45 UTC

head link

[R] combine two columns

Hello,

Following should work.

m <- matrix(round(runif(16,0,2)),nrow=2)
colnames(m) <-
c("A","A","B","B","C","C","D","D")
m2 <- m #matrix(, nrow=dim(m)[1], ncol=dim(m)[2]/2)
z <- 1
ss <- seq(1,dim(m)[2],2)

for(j in ss){
  for(i in 1:dim(m)[1]){
    m2[i,j] <- substring(m[i,ss[z]] == m[i,ss[z]+1],1,1)
  }
  z <- z + 1
}
m2 <- m2[,ss]
colnames(m2) <- colnames(m)[ss]

When your data set is large, then you should try to code this using
apply.

Best,
Matthias
> 
> Hi,
> 
> I have an R programming problem and I havent found anything 
> in the documentation yet:
> 
> I have a data matrix, in which two neighbouring columns 
> represent replicates of the same experiment, e.g. something like this:
> 
>        A A B B C C
> row1   1 1 1 2 2 2
> row2   1 1 1 1 1 2
> 
> I would like to test, if the values for the two replicates in 
> a row are the same or if they differ and generate a new 
> matrix with the results of the tests, something like this:
> 
>         A B C
> row1    T F T
> row2    T T F
> 
> Any hint will be appreciated!
> 
> Georg
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list 
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read 
> the posting guide! http://www.R-project.org/posting-guide.html
>

Petr Pikal

2005-Nov-29 14:00 UTC

head link

[R] combine two columns

Hallo

On 28 Nov 2005 at 18:47, Georg Otto wrote:

To:             	r-help at stat.math.ethz.ch
From:           	Georg Otto <georg.otto at tuebingen.mpg.de>
Date sent:      	Mon, 28 Nov 2005 18:47:38 +0100
Subject:        	[R] combine two columns
> Hi,
> 
> I have an R programming problem and I havent found anything in the
> documentation yet:
> 
> I have a data matrix, in which two neighbouring columns represent
> replicates of the same experiment, e.g. something like this:
> 
>        A A B B C C
> row1   1 1 1 2 2 2
> row2   1 1 1 1 1 2
Not very neat but
> tabul      A A.1 B B.1 C C.1 
 row1 1   1 1   2 2   2
 row2 1   1 1   1 1   2

 > logmat<-as.logical(apply(tabul,1,diff))
 > dim(logmat)<-c(2,5)
 > logmat
       [,1]  [,2]  [,3]  [,4]  [,5]
 [1,] FALSE  TRUE FALSE FALSE FALSE
 [2,] FALSE FALSE FALSE FALSE  TRUE


 > liche
 function (x) 
 {
     indices <- seq(along = x)
     x[indices%%2 == 1]
 }

 > !logmat[,liche(1:5)]
     [,1] [,2]  [,3]
[1,] TRUE TRUE  TRUE
[2,] TRUE TRUE FALSE>
Finally gives the result you want.

HTH
Petr
> 
> I would like to test, if the values for the two replicates in a row
> are the same or if they differ and generate a new matrix with the
> results of the tests, something like this:
> 
>         A B C
> row1    T F T
> row2    T T F
> 
> Any hint will be appreciated!
> 
> Georg
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html
Petr Pikal
petr.pikal at precheza.cz

Bill West

2005-Nov-29 14:28 UTC

head link

[R] combine two columns

Yet another way...
 
a<-matrix(c(1,1,1,1,1,1,2,1,2,1,2,2),nr=2)
x<-c("A","B","C")
colnames(a)<-sort(rep(x,2))
compare<-function(x,a){all(a[1,colnames(a)==x]==a[1,x][1])}
v<-function(y,x,compare,a){sapply(x,compare,a=a[y,,drop=F])}
t(sapply(1:nrow(a),v,x,compare,a))

--Bill

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Georg Otto
Sent: Monday, November 28, 2005 12:48 PM
To: r-help at stat.math.ethz.ch
Subject: [R] combine two columns

Hi,

I have an R programming problem and I havent found anything in the
documentation yet:

I have a data matrix, in which two neighbouring columns represent replicates
of the same experiment, e.g. something like this:

       A A B B C C
row1   1 1 1 2 2 2
row2   1 1 1 1 1 2

I would like to test, if the values for the two replicates in a row are the
same or if they differ and generate a new matrix with the results of the
tests, something like this:

        A B C
row1    T F T
row2    T T F

Any hint will be appreciated!

Georg

______________________________________________
R-help at stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html

Gabor Grothendieck

2005-Nov-29 15:03 UTC

head link

[R] combine two columns

Try this:
> is.odd <- !array(0:1, ncol(mat))
> mat[,is.odd] == mat[,!is.odd]        A     B     C
row1 TRUE FALSE  TRUE
row2 TRUE  TRUE FALSE

On 11/28/05, Georg Otto <georg.otto at tuebingen.mpg.de>
wrote:> Hi,
>
> I have an R programming problem and I havent found anything in the
> documentation yet:
>
> I have a data matrix, in which two neighbouring columns represent
> replicates of the same experiment, e.g. something like this:
>
>       A A B B C C
> row1   1 1 1 2 2 2
> row2   1 1 1 1 1 2
>
> I would like to test, if the values for the two replicates in a row
> are the same or if they differ and generate a new matrix with the
> results of the tests, something like this:
>
>        A B C
> row1    T F T
> row2    T T F
>
> Any hint will be appreciated!
>
> Georg
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
>

Srinivas Iyyer

2005-Nov-29 18:16 UTC

head link

[R] R software on 64bit - Intel Xeon processor

Dear Group, 
 I have a machine which has a 64bit Intel?? Xeon?
Processor 3.00GHz, 2MB L2 Cache 6T302N - [ 221-7984 ]
processor. 
(Dell Precision Workstation 670n Intel?? Xeon?
Processor)

The OS is RedHat Enterprise Linux version 4 (for
64bit). 

I went to /bin/linux/redhat/el4/i386 on CRAN FTP site.
 I have no clue if any of these RPMs are suitable for
this machines configuration. 

Could any one point me to an appropriate RPM that I
can download and install it on this machine. 

Thank you. 

Sr

Gabor Grothendieck

2005-Nov-29 22:49 UTC

head link

[R] combine two columns

And here is one minor variation of this:

odd <- seq(1, ncol(mat), 2)
mat[,odd] == mat[,odd+1]

On 11/29/05, Gabor Grothendieck <ggrothendieck at gmail.com>
wrote:> Try this:
>
> > is.odd <- !array(0:1, ncol(mat))
> > mat[,is.odd] == mat[,!is.odd]
>        A     B     C
> row1 TRUE FALSE  TRUE
> row2 TRUE  TRUE FALSE
>
> On 11/28/05, Georg Otto <georg.otto at tuebingen.mpg.de> wrote:
> > Hi,
> >
> > I have an R programming problem and I havent found anything in the
> > documentation yet:
> >
> > I have a data matrix, in which two neighbouring columns represent
> > replicates of the same experiment, e.g. something like this:
> >
> >       A A B B C C
> > row1   1 1 1 2 2 2
> > row2   1 1 1 1 1 2
> >
> > I would like to test, if the values for the two replicates in a row
> > are the same or if they differ and generate a new matrix with the
> > results of the tests, something like this:
> >
> >        A B C
> > row1    T F T
> > row2    T T F
> >
> > Any hint will be appreciated!
> >
> > Georg
> >
> > ______________________________________________
> > R-help at stat.math.ethz.ch mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
> >
>

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