Comments for The Matrix Cookbook http://matrixcookbook.com A free mathematical desktop reference on matrices Tue, 07 Sep 2010 18:33:04 +0000 http://wordpress.org/?v=2.5.1 Comment on Four years birthday for the cookbook by MartinH http://matrixcookbook.com/?p=15#comment-450 MartinH Sat, 08 Nov 2008 21:57:11 +0000 http://matrixcookbook.com/?p=15#comment-450 In chapter 9.5.1 (Ortho-Sym) the formula is correct only for k being a natural number (including 0). For k being a real number, a purely complex term must be added to (352): ... + i * sin (K*pi/2) * (I-Q). This can be derived from the complex term in (-1)**k = (e**(i*pi))**k = e**(k*i*pi) = cos(k*pi) + i*sin(k*pi). Probably an analoguous change is needed in 9.5.2. (In general, an indication about the used number space - e.g. natural, real, complex - would be beneficial in some places of this great document.) In chapter 9.5.1 (Ortho-Sym) the formula is correct only for k being a natural number (including 0). For k being a real number, a purely complex term must be added to (352): … + i * sin (K*pi/2) * (I-Q). This can be derived from the complex term in (-1)**k = (e**(i*pi))**k = e**(k*i*pi) = cos(k*pi) + i*sin(k*pi). Probably an analoguous change is needed in 9.5.2. (In general, an indication about the used number space - e.g. natural, real, complex - would be beneficial in some places of this great document.)

]]> Comment on Four years birthday for the cookbook by Yuchuan http://matrixcookbook.com/?p=15#comment-318 Yuchuan Fri, 12 Sep 2008 19:37:09 +0000 http://matrixcookbook.com/?p=15#comment-318 cong! cong!

]]> Comment on Four years birthday for the cookbook by nori http://matrixcookbook.com/?p=15#comment-292 nori Wed, 03 Sep 2008 00:06:38 +0000 http://matrixcookbook.com/?p=15#comment-292 Hey, just found an error in the cookbook: In 9.4.1 it says: "A matrix is nilpotent, if A²=0" But as far as I know it is if an integer n exists with A^n = 0. Wikipedia got it right: http://en.wikipedia.org/wiki/Nilpotent_matrix Great PDF, Nori Hey, just found an error in the cookbook:

In 9.4.1 it says: “A matrix is nilpotent, if A²=0″
But as far as I know it is if an integer n exists with A^n = 0.
Wikipedia got it right: http://en.wikipedia.org/wiki/Nilpotent_matrix

Great PDF,

Nori

]]> Comment on Updated version of The Matrix Cookbook by Andrei Rotenstein http://matrixcookbook.com/?p=14#comment-230 Andrei Rotenstein Fri, 09 May 2008 19:45:32 +0000 http://matrixcookbook.com/?p=14#comment-230 I also wanna say "thank you!" It's an excellent resource. Keep it up! I also wanna say “thank you!”

It’s an excellent resource. Keep it up!

]]> Comment on Updated version of The Matrix Cookbook by nanmus http://matrixcookbook.com/?p=14#comment-228 nanmus Thu, 08 May 2008 16:25:15 +0000 http://matrixcookbook.com/?p=14#comment-228 Fantastic book !!! Thank you so much for such a gorgeous reference. Fantastic book !!! Thank you so much for such a gorgeous reference.

]]> Comment on Updated version of The Matrix Cookbook by Pu http://matrixcookbook.com/?p=14#comment-212 Pu Fri, 25 Apr 2008 22:15:59 +0000 http://matrixcookbook.com/?p=14#comment-212 Your book are great! Thank you very much! Your book are great! Thank you very much!

]]> Comment on Updated version of The Matrix Cookbook by Jian Cheng http://matrixcookbook.com/?p=14#comment-202 Jian Cheng Tue, 01 Apr 2008 00:01:31 +0000 http://matrixcookbook.com/?p=14#comment-202 very good very good

]]> Comment on Updated version of The Matrix Cookbook by Gwangghi Kim http://matrixcookbook.com/?p=14#comment-165 Gwangghi Kim Sat, 01 Mar 2008 22:27:39 +0000 http://matrixcookbook.com/?p=14#comment-165 Thank you. Sincerely, Thank you.
Sincerely,

]]> Comment on New website for The Matrix Cookbook by Niaz Hussain Ghumro http://matrixcookbook.com/?p=3#comment-47 Niaz Hussain Ghumro Fri, 26 Oct 2007 09:56:20 +0000 http://matrixcookbook.com/?p=3#comment-47 Dear Sirs I have never seen such a book on only matrices. Such books are benefial for new researchers in the fields of sciences niaz Hussain Ghumro lecturer in maths Sukkur IBA Sindh Pakistan Dear Sirs
I have never seen such a book on only matrices.
Such books are benefial for new researchers in the fields of sciences
niaz Hussain Ghumro
lecturer in maths
Sukkur IBA Sindh Pakistan

]]> Comment on New version of the cookbook by Wahoo http://matrixcookbook.com/?p=8#comment-32 Wahoo Sat, 06 Oct 2007 08:17:02 +0000 http://matrixcookbook.com/?p=8#comment-32 Thank you for sharing! Thank you for sharing!

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