[R] Code bug unresolved involving if condition
Prof Brian Ripley
ripley at stats.ox.ac.uk
Fri Apr 25 17:34:47 CEST 2003
The message is both pleasant and accurate! It indicates that you have
made an error, and tells you what the error is.
foo == NA is always missing, since NA denotes a missing value.
Use is.na(foo): see ?is.na.
On Fri, 25 Apr 2003 vincent.stoliaroff at socgen.com wrote:
> Hi R lovers!
>
> I am a beginner in coding with R so my question may be very easily solved
> but I don't know how.
>
> I have written the following function in a .txt file
>
>
> ClearDelta <- function(Matrix)
> {
> ncol<-ncol(Matrix);nrow<-nrow(Matrix);
> for (i in 1:nrow) {
> for (j in 1:(ncol-1))
> {if (Matrix[i,j]==NA) (NA->Matrix[i,j+1])}
> }
> }
>
> I can charge it with the source() command
> But I get the following message when applied to a matrix
>
> > ClearDelta(MatCor)
> Error in if (Matrix[i, j] == NA) (Matrix[i, j + 1] <- NA) :
> missing value where logical needed
>
> MatCor is the following Matrix
>
> > MatCor
> [,1] [,2] [,3]
> [1,] NA 0.9870676 0.04648933
> [2,] 0.98706757 1.0000000 -0.17353590
> [3,] 0.04648933 -0.1735359 1.00000000
>
> Do you know why I get such an unpleasant message from so polite a software?
>
> Thanks to anybody who could help.
--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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