This could work, but not with big matrix! year <- c(1990,1995,2000,2005) Prod <- c(2478,3192,NA,1594)
matrix <- data.frame(cbind(year,Prod))
for (i in 1:dim(matrix)[1])
{
if (is.na(matrix[i,2])) {matrix[i,2] <- 0}
}
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