R help - May 2006 - quadrati form

Need to compute the numerical value of the solution of the quadratic form:
X'AX=I
where all the matrices are (n*n) [n may be very large]; X is the matrix 
containing n*n unknowns (those I need) and A contains the coefficients 
of the problem. "I" is the identity matrix of order n.
thanks in advance, Lorenzo

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credo nella ragione umana, 
e nella liberta' e nella giustizia che dalla ragione scaturiscono.
(sciascia)

Look at
?eigen

In your example, you are looking for
eigen(A)