R help - Aug 2006 - how to link matrix with the variables

Dear friends,
  Suppose  the correlation matrix of x1-x3 is as follows:
     x1     x2   x3
x1  1
x2  0.5    1
x3  0.6   0.4    1
1.First, to generate the matrix of x1-x3 in R;
2.to get the random number: x1<-rnorm(10), is it enough to generate only the
x1-values? Do i need to generate x2 and x3?
3. y=x1+2*x2+3*x3 , to generate the y-values;
Thanks very much!


-- 
Kind Regards,
Zhi Jie,Zhang

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