Dear R- User

    I created  two random number sets using rnorm function and calcuted their respective means. However now I would like to randomly
replace some values with NA. Thus create my own test data.
      Any help or suggestions on this ?


 Also wanted to confirm when multiplying two random number vectors x am y by matrix..is this how i do it.
A is the matrix
        
       z <- c(x,y)    # x and y the two set of vectors
    
       w <- A%*%Z   # each element in each vector multipled by the matrix .


regards
Kunal


