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From: Angus Leeming (angus.leeming_at_[hidden])
Date: 2004-04-08 09:59:17

Russell Hind wrote:
>> It isn't too terrible, but to invert it it must be square...

> Well, the bit I need to invert is
> prod(trans(X), X) so X is 500 x 5. Is this possible?

X is 500x5
trans(X) is 5x500
prod(trans(X),X) is 5x5, which is a square matrix. So, yes, it can be
inverted (all other requirements assumed satisfied...). And if it's
5x5 the lu_ functions are perfect. In fact, you could probably invert
it by hand ;-)


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