----- Original Message ----
From: Shang Liu <[EMAIL PROTECTED]>
Subject: [R] how to replace NA values in a list
I have a matrix named "spec" (see below), it is a 6x3 matrix, and each element
of spec is a list. For example, spec[1,"wavenumber"] is a list, and it contains
1876 numeric numbers and NAs. I want to replace the NAs to zero, but don't know
how to change it, the difficulty may be all the elements are of the class list,
so it is hard to change.
Thank you for your help!
matrix spec:
wavenumber prescan postscan
H001 Numeric,1876 Numeric,1876 Numeric,1876
H002 Numeric,1876 Numeric,1876 Numeric,1876
H003 Numeric,1876 Numeric,1876 Numeric,1876
H004 Numeric,1876 Numeric,1876 Numeric,1876
H005 Numeric,1876 Numeric,1876 Numeric,1876
H006 Numeric,1876 Numeric,1876 Numeric,1876
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===
Hi Shang,
spec[1,"wavenumber"] is a list, but spec[[1,"wavenumber"]] is a vector
(Numeric,1876).
Something like
spec[[1,"wavenumber"]] <-
replace(spec[[1,"wavenumber"]],is.na(spec[[1,"wavenumber"]]),0)
or
spec[,"wavenumber"] <- lapply(spec[,"wavenumber"],function(x)
replace(x,is.na(x),0))
or
spec[] <- lapply(spec,function(x) replace(x,is.na(x),0))
could work, depending on how many of the matrix's elements you want to replace.
Satoshi
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