[R] Generation of correlated variables

[Filoche]

Hi everyone.

Based on a dependent variable (y), I'm trying to generate some independent
variables with a specified correlation. For this there's no problems.
However, I would like that have all my "regressors" to be orthogonal (i.e.
no correlation among them.

For example, 

y = x1 + x2 + x3 where the correlation between y x1 = 0.7, x2 = 0.4 and x3 =
0.8.  However, x1, x2 and x3 should not be correlated to each other.

Anyone can help me?

Regards,
Phil

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