Archive for December, 2007

Correction to Mixtures of Gaussian

Friday, December 21st, 2007

Thanks to Professor Ralf Östermark, Åbo Akademi University, we have become aware of an error in the derivative of Mixtures of Gaussian in section 8.4.2 (version sep 2007). The derivative of the density with respect to the mean vector, should not have a minus sign, and the correct formula are:

 It is equation (315) in the image above which have been corrected (above formula is correct).

We apologize for the inconvenience and will of course make sure the error will be corrected in the next updated version of “The Matrix Cookbook”.

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Temporary explosion in downloads

Thursday, December 20th, 2007

As we were gearing up to celebration of download number 100.000, things suddenly changed fast: In one hectic week several hundred thousands downloads erupted out of nowhere, boosting the total far beyond 400.000. Looking errornous or at least unregular in some way, we are looking into what happened, but have not yet finished that part.

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