LFD Book Forum Minimizing Ein by differentiation wr.t w
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#1
10-17-2013, 09:22 PM
 blunderboy Junior Member Join Date: Aug 2013 Posts: 5
Minimizing Ein by differentiation wr.t w

Can somebody please explain me how we got X' (X' is X Transpose) outside the braces after differentiation. Shouldn't it be X instead of X'.

When I revisited the lecture, I recalled professor saying it is not actually square. It is just transpose multipled by itself. This concept is not clear to me..

Appreciate the help
#2
10-17-2013, 11:34 PM
 yaser Caltech Join Date: Aug 2009 Location: Pasadena, California, USA Posts: 1,478
Re: Minimizing Ein by differentiation wr.t w

Quote:
 Originally Posted by blunderboy Can somebody please explain me how we got X' (X' is X Transpose) outside the braces after differentiation. Shouldn't it be X instead of X'. When I revisited the lecture, I recalled professor saying it is not actually square. It is just transpose multipled by itself. This concept is not clear to me.. Appreciate the help
This comes from matrix calculus. The quantity is in fact .

The squared matrix I referred to was .
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#3
10-18-2013, 04:45 AM
 blunderboy Junior Member Join Date: Aug 2013 Posts: 5
Re: Minimizing Ein by differentiation wr.t w

Aah..Got it. Thank you professor. I really appreciate the quick help from you. Your presence in the forum really help us. Thanks a lot!!
#4
10-18-2013, 10:46 AM
 yaser Caltech Join Date: Aug 2009 Location: Pasadena, California, USA Posts: 1,478
Re: Minimizing Ein by differentiation wr.t w

Quote:
 Originally Posted by blunderboy Aah..Got it. Thank you professor. I really appreciate the quick help from you. Your presence in the forum really help us. Thanks a lot!!
You are most welcome.
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