[R] 0 * NA = NA

[Petr Klasterecky]

Alberto Monteiro napsal(a):
> Is there any way to "force" 0 * NA to be 0 instead of NA?

No (AFAIK), and it is pretty reasonable to define it this way.
If you want to treat the NAs as zeros, use
x[is.na(x)] <- 0

Petr

> For example, suppose I have a vector with some valid values, while
> other values are NA. If I matrix-pre-multiply this by a weight 
> row vector, whose weights that correspond to the NAs are zero,
> the outcome will still be NA:
> 
> x <- c(1, NA, 1)
> wt <- c(2, 0, 1)
> wt %*% x # NA
> 
> Alberto Monteiro
> 
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-- 
Petr Klasterecky
Dept. of Probability and Statistics
Charles University in Prague
Czech Republic