[R] How to find matching columns in a matrix of lists?

[arun]

HI,

Does this work for you?
 mapply(function(x) x=="B",m)
      [,1]  [,2]  [,3]
#[1,] FALSE FALSE FALSE
#[2,]  TRUE FALSE  TRUE
A.K.




----- Original Message -----
From: Asis Hallab <asis.hallab at gmail.com>
To: r-help at r-project.org
Cc: 
Sent: Tuesday, December 4, 2012 4:16 PM
Subject: [R] How to find matching columns in a matrix of lists?

Dear R users,

I have a matrix composed of lists:

m <- matrix( list(), nrow=1, ncol=3 )
m[[ 1, 1 ]] <- list("A", "B")
m[[ 1, 2 ]] <- list("A", "C")
m[[ 1, 3 ]] <- list("A", "B")

and want to get the sub-matrix where cells contain "B".
But

m[ , "B" %in% m[ 1, ], drop=F ]

as well as

m[ , "B" %in% m[ 1, ][], drop=F ]

return empty matrices.

Any ideas, hints and help will be very much appreciated!
Kind regards!
Josef

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