[R] data comparison

[arun]

Hi,

Assuming the data structure is similar to this example:
 difMH<-list(c(1,9,19,21,22,24,25,27,29,30,34,38,40),c(1,2,9,14,18,19,21,22,25,28,30,34,38,39),c(1,8,9,19,21,22,24,25,26,28,30,34,38),c(1,8,9,10,16,18,21,22,25,28,30,32,34,38,39),c(1,9,19,21,22,23,25,27,30,34,36,38,39),c(1,9,10,11,17,18,21,22,23,25,28,34,38,39))
names(difMH)<-c(100,90,80,70,60,50)
 difMH<-lapply(difMH,function(x) data.frame(DIFitems=x,newcol=seq_along(x)))
res1<-sapply(difMH,`[`,1)
res2<-t(sapply(res1,`[`,1:max(sapply(res1,length))))

 res2
#             [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12]
#100.DIFitems    1    9   19   21   22   24   25   27   29    30    34    38
#90.DIFitems     1    2    9   14   18   19   21   22   25    28    30    34
#80.DIFitems     1    8    9   19   21   22   24   25   26    28    30    34
#70.DIFitems     1    8    9   10   16   18   21   22   25    28    30    32
#60.DIFitems     1    9   19   21   22   23   25   27   30    34    36    38
#50.DIFitems     1    9   10   11   17   18   21   22   23    25    28    34
  #           [,13] [,14] [,15]
#100.DIFitems    40    NA    NA
#90.DIFitems     38    39    NA
#80.DIFitems     38    NA    NA
#70.DIFitems     34    38    39
#60.DIFitems     39    NA    NA
#50.DIFitems     38    39    NA
 is.matrix(res2)
#[1] TRUE

#For the second part, similar to Rui's solution:
hit<- do.call(rbind,lapply(res1,function(x) length(intersect(x,comp))))
flarm<- do.call(rbind,lapply(res1,function(x) length(setdiff(x,comp))))

A.K.


----- Original Message -----
From: Yung Chih Ou <chihchihou at gmail.com>
To: r-help <r-help at r-project.org>
Cc: 
Sent: Wednesday, December 26, 2012 7:37 AM
Subject: [R] data comparison

Dear all:

I have six vector from six DIF detection results.
as below:
> difMH[[100]]$DIFitems
[1]  1  9 19 21 22 24 25 27 29 30 34 38 40
> difMH[[90]]$DIFitems
[1]  1  2  9 14 18 19 21 22 25 28 30 34 38 39
> difMH[[80]]$DIFitems
[1]  1  8  9 19 21 22 24 25 26 28 30 34 38
> difMH[[70]]$DIFitems
[1]  1  8  9 10 16 18 21 22 25 28 30 32 34 38 39
> difMH[[60]]$DIFitems
[1]  1  9 19 21 22 23 25 27 30 34 36 38 39
> difMH[[50]]$DIFitems
[1]  1  9 10 11 17 18 21 22 23 25 28 30 34 38 39

I have two questions.

first, how to combine these to a matrix?

second, how to compare them with "1 9 21 22 25 30 34 38"
how much units hit?
how much units are false-alarm?

thanks!

______________________________________________
R-help at 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.