R help - Jun 2008 - missing data

hi
 
  I would like to know how I can complete those missing data from these
programs:
 
program number one
  
DATOS2 <- sin(seq(1,20,0.1))
> DATOS2[103] <- NA
> DATOS2[65] <- NA
> DATOS2[134] <- NA
 
 
  this is the other one
 
> data(pressure)
> DATOS3 <- pressure
> DATOS3[4,1] <- NA
> DATOS3[14,1:2] <- c(NA,NA)
> DATOS3[17,2] <- NA
 
                             
                        
 
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