[R] missing TRUE/FALSE error in conditional construct

[rcoder]

Hi everyone,

I posted something similar to this in reply to another post, but there seems
to be a problem getting it onto the board, so I'm starting a new post.

I am trying to use conditional formatting to select non-zero and non-NaN
values from a matrix and pass them into another matrix. The problem is that
I keep encountering an error message indicating the ":missing value where
TRUE/FALSE needed "

My code is as follows:

##Code Start 
mat_zeroless<-matrix(NA,5000,2000) #generating holding matrix 

##Assume source matrix containing combination of values, NaNs and zeros##
for (j in 1:5000) 
        { 
for (k in 1:2000) 
{ 
if(mat[j,k]!=0 & !is.NaN(mat[j,k])) {mat_zeroless[j,k]<-mat[j,k]} 
} 
        } 
##Code End 

Error in if (mat[j,k] !=0 & !is.NaN(mat[j,k])) { :missing value where
TRUE/FALSE needed 

I'm not sure how to resolve this.

rcoder 
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