Book Reviews
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Wednesday, September 4, 2002
![[Item Permalink]](http://radio.weblogs.com/0112083/images/ur_bullet.gif){kind=small} Second edition of Numerical Methods in Practice -- Comment()
Today I finished editing the second edition of our book titled Numerical Methods in Practice ("Numeeriset menetelmät käytännössä", written in Finnish). The book is available on the web in PDF format at the address http://www.csc.fi/oppaat/num.kayt/ There are two PDF files: the whole book, about 6.3 MB, and the introductory chapters plus appendixes, about 800 kB. There are 415 pages in the book, only 29 more than in the first edition. New topics include wavelets, the Fourier transform, and adaptive FEM. The printed version will appear this Fall.
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Spam filtering -- Comment()
I started to wonder about the algorithm used in the Mail spam filter on Jaguar (Mac OS X 10.2). There is also a tool called bogofilter (http://www.tuxedo.org/~esr/bogofilter/). This software is based on Bayesian statistics. See article "A Plan for Spam" by Paul Graham (http://www.paulgraham.com/spam.html). So far the spam filter of Mail has generated one false positive in 15 mails, and it missed two or three spam messages.
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