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I have a 520 x 520 mat matrix with 2 on the diagonal and 1 off-diagonal. If I do inv(mat)*mat, I do not get an identity matrix. I get 1 on the diagonal but -0.000000001, -0.000000002, or 0.000000004. Why is that?

Plug4
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  • Take a look at the answer in the duplicate I have linked. You will see why `inv(mat)*mat` is not desired, and that you should really be using `mat \ mat` instead (which should give you identity). – rayryeng Jan 28 '15 at 06:49
  • Oh I see! thanks for answer and sorry for the duplicate. – Plug4 Jan 28 '15 at 06:56
  • Not a problem at all :) This is a common question that people ask. I marked it as a duplicate so that people who come here will know the answer immediately. I had to do a bit of digging to find it. No need to apologize! Good luck! – rayryeng Jan 28 '15 at 07:03

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