Thread: Exercise 3.4
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Old 10-08-2013, 07:39 AM
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magdon magdon is offline
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Default Re: Exercise 3.4

You are right, H is an N\times Nmatrix. But its trace is not N. You may consider looking through Exercise 3.3, and in particular, part (d) should be helpful.

Originally Posted by smiling_assassin View Post
But isn't H a N \times N matrix? So trace would be N instead of d+1? I know X is N\times(d+1). What am I missing?
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