definiteness of a quadratic form

From: analyst41@xxxxxxxxxxx
Date: 6 Nov 2006 16:15:58 -0800

Suppose we have a quadratic form x'Qx where

Q(i,j) = 0 if i = j

and

Case (1) Q(i,j) = 1 if i<>j

Case (2) Q(i,j) >=0 for i<> j.

Would appreciate any help to determine if the form is positive or
negative (semi) definite.

Thanks.

.

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