On Thu, Mar 09, 2006 at 08:44:27AM -0500, Chuck Cleland wrote:
<Chuck>X <- matrix(c( 1, 2, 3, 4, "x",
<Chuck> "x", 2, 2, 2, 2,
<Chuck> 2, 2, 2, "x", 2),
<Chuck> ncol=5, byrow=TRUE)
Why not:
X[X=="x"] <- NA
mode(X) <- "numeric" ## to get a numeric matrix
Btw if you got X with read.table you can specify the missing string.
?read.table
Ste
<Chuck>
<Chuck>X.new <- matrix(as.numeric(X), ncol=ncol(X))
<Chuck>
<Chuck>or
<Chuck>
<Chuck>X.new <- apply(X, 2, function(x){replace(x, x == "x", NA)})
<Chuck>
<Chuck>Stefan Semmeling wrote:
<Chuck>> dear list,
<Chuck>>
<Chuck>> i have a matrix with missing values like
<Chuck>>
<Chuck>> 1 2 3 4 x
<Chuck>> x 2 2 2 2
<Chuck>> 2 2 2 x 2
<Chuck>>
<Chuck>> the x stands for the missing value.
<Chuck>> i have to substitute it to NA
<Chuck>>
<Chuck>> substitute or replace didn?t work out, as they are for vectors only
<Chuck>>
<Chuck>> however matrix[,i] also didn?t work.
<Chuck>>
<Chuck>> can anybody tell me, who i can change these values easily?
<Chuck>>
<Chuck>> thanks stefan
<Chuck>>
<Chuck>> [[alternative HTML version deleted]]
<Chuck>>
<Chuck>>
<Chuck>>
<Chuck>>
------------------------------------------------------------------------
<Chuck>>
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<Chuck>
<Chuck>--
<Chuck>Chuck Cleland, Ph.D.
<Chuck>NDRI, Inc.
<Chuck>71 West 23rd Street, 8th floor
<Chuck>New York, NY 10010
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<Chuck>
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