try the following:
delta <- c(2.5, 2.5, 1)
v <- list(
matrix(round(rnorm(70, 2), 2), 5, 14),
matrix(round(rnorm(70, 2), 2), 5, 14),
matrix(round(rnorm(70, 2), 1), 5, 14)
)
v
mapply(function(x, y){ x[x > y] <- NA; x }, v, delta, SIMPLIFY =
FALSE)
I hope it helps.
Best,
Dimitris
----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
http://www.student.kuleuven.be/~m0390867/dimitris.htm
----- Original Message -----
From: "dxc13" <[EMAIL PROTECTED]>
To: <r-help@r-project.org>
Sent: Tuesday, January 08, 2008 6:11 PM
Subject: [R] using lapply()
>
> useR's,
>
> I am trying to find a quick way to change some values in a list that
> are
> subject to a condition to be NA. Consider the 3x1 matrix:
>
> delta <- matrix(c(2.5,2.5,1), nrow = 1)
>
> And consider the list named v that has 3 elements
>> v
> v[[1]]
> [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
> [,11] [,12]
> [,13] [,14]
> [1,] 4.25 3.25 2.25 1.25 0.25 0.75 1.75 2.75 3.75 4.25 3.25 2.25
> 1.25
> 0.25
> [2,] 1.25 0.25 0.75 1.75 2.75 3.75 4.75 5.75 6.75 1.25 0.25 0.75
> 1.75
> 2.75
> [3,] 7.25 6.25 5.25 4.25 3.25 2.25 1.25 0.25 0.75 7.25 6.25 5.25
> 4.25
> 3.25
> [4,] 3.25 2.25 1.25 0.25 0.75 1.75 2.75 3.75 4.75 3.25 2.25 1.25
> 0.25
> 0.75
> [5,] 6.25 5.25 4.25 3.25 2.25 1.25 0.25 0.75 1.75 6.25 5.25 4.25
> 3.25
> 2.25
>
> v[[2]]
> [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11]
> [,12]
> [,13] [,14]
> [1,] 9.25 9.25 9.25 9.25 9.25 9.25 9.25 9.25 9.25 8.25 8.25 8.25
> 8.25
> 8.25
> [2,] 7.25 7.25 7.25 7.25 7.25 7.25 7.25 7.25 7.25 6.25 6.25 6.25
> 6.25
> 6.25
> [3,] 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 0.25 0.25 0.25
> 0.25
> 0.25
> [4,] 4.25 4.25 4.25 4.25 4.25 4.25 4.25 4.25 4.25 3.25 3.25 3.25
> 3.25
> 3.25
> [5,] 6.25 6.25 6.25 6.25 6.25 6.25 6.25 6.25 6.25 5.25 5.25 5.25
> 5.25
> 5.25
>
> v[[3]]
> [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11]
> [,12] [,13]
> [,14]
> [1,] 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
> 0.5
> 0.5
> [2,] 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5
> 1.5
> 1.5
> [3,] 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5
> 2.5
> 2.5
> [4,] 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5
> 3.5
> 3.5
> [5,] 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5
> 4.5
> 4.5
>
> The first element of the matrix delta (2.5) corresponds to the first
> list
> element v[[1]], and so on...
>
> What I want to do is to set any values in this list that are greater
> than
> its corresponding delta to be NA. For example, if any value in
> v[[1]] is
> greater than 2.5 than set it to NA, and similarly for v[[2]]. If
> any value
> in v[[3]] is > 1, then set it NA.
>
> Can this be done using lapply or some other quick, efficient way?
> Hope this
> makes sense.
> Thanks,
>
> Derek
> --
> View this message in context:
> http://www.nabble.com/using-lapply%28%29-tp14693921p14693921.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help@r-project.org mailing list
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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