### Name: na.handling
### Title: Handling of Missing Values
### Aliases: na.handling
### Keywords: utilities

### ** Examples

   mat<-matrix(1:20,5,4)
   mat[1,2]<-NA
   mat
   
   # Replace the missing value by the mean of the first row.
   na.handling(mat)
   
   # Remove the first row.
   na.handling(mat,na.replace=FALSE)
   
   # Replace the missing value in the first row by the mean of
   # this row, and remove the second row containing only NAs.
   mat[2,]<-NA
   mat
   na.handling(mat)