Dear Gretl users, <br><br>I know my question may seem (it actually is) very banal, but I can&#39;t figure out a way to check if two matrices are equal. <br><br>The point is verifying idempotence and symmetry for an orthogonal projector. The mathematical proof isn&#39;t required here: the point is showing that the actual calculated matrices are orthogonal projectors and therefore have the specified properties; I got to show the numbers are the same. And apart from arbitrary extraction of submatrices to prove they get out same, I can&#39;t think of anything &#39;scientific&#39;.<br>
<br>Hope you will be able to help me with the matter.<br><br>Regards,<br><br>SP<br>