[R] NA value

Doran, Harold
Fri, 27 Jun 2008 15:14:51 -0000

Don't use a loop for this. Do this.

X <- matrix(c(NA, 2, NA, 4),ncol=2) # Sample matrix

X[is.na(X)] <- 0 # Do this instead

> -----Original Message-----
> From: r-help-bounces at r-project.org
> [mailto:r-help-bounces at r-project.org] On Behalf Of Alfredo
> Alessandrini
> Sent: Friday, June 27, 2008 10:37 AM
> To: r-help at r-project.org
> Subject: [R] NA value
>
> I'm trying to replace NA with 0 value...
>
> I've write a loop, but don't work...
>
> Where's the problem?
>
>
> > cimfasy_rwl
> 1991     0.92     0.72     0.50     1.29     0.54     1.22
> 1992     2.15     1.28     1.23     2.26     1.22     3.17
> 1993     1.50     0.87     1.68     1.97     0.83     2.55
> 1994     0.69     0.00     0.76     1.89     0.60     0.87
> 1995     1.13     1.04     1.19     1.52     1.13     1.78
> 1996     1.15     0.92     1.50     0.97     0.60       NA
> 1997       NA       NA       NA       NA       NA       NA
> 1998       NA       NA       NA       NA       NA       NA
> 1999       NA       NA       NA       NA       NA       NA
> 2000       NA       NA       NA       NA       NA       NA
> > files_rwl <- ls(pattern="_rwl$")
> > files_rwl
> [1] "cimfasy_rwl" "rocquce_rwl"
> > for (i in files_rwl) assign(i,i[is.na(i)] <- 0)
> > ls()
> [1] "cimfasy_rwl" "files_rwl"   "files.rwl"
"i"
> "rocquce_rwl"
> >
> > cimfasy_rwl
> [1] 0
> >
>
>
> Thanks in advance,
>
> Alfredo
>
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