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php Programming Glossary: vectorsLSA - Latent Semantic Analysis - How to code it in PHP? http://stackoverflow.com/questions/1014927/lsa-latent-semantic-analysis-how-to-code-it-in-php SVD function will give the singular values and singular vectors in descending order. If not you have to do more acrobatics... a good approximation for the basis is to keep enough vectors such that their singular values are more than 50 of the total.. list. This step should be reasonable since the number of vectors will be finite. Assuming you have a vector v1 of words for a..
N-grams: Explanation + 2 applications http://stackoverflow.com/questions/1032288/n-grams-explanation-2-applications Wikipedia article for dogs and basketball build the n gram vectors for both documents normalize them calculate Manhattan Euclidian.. another or the algorithms won't work. You will wnd up with vectors like 0 0 0 0 1 1 0 0 2 0 0 1 as most documents will not contain..
How do I check if a longitude/latitude point is within a range of coordinates? http://stackoverflow.com/questions/11510326/how-do-i-check-if-a-longitude-latitude-point-is-within-a-range-of-coordinates ret A great circle segment can be represented by the vectors passing through the segment's start and end points. class GreatCircleSegment.. of a great circle segment or the angle between any two vectors using the dot product . double Vector DotProduct Vector other.. return math.sqrt this.x^2 this.y^2 this.z^2 for any two vectors `a` and `b` a.DotProduct b a.magnitude b.magnitude cos theta..
What is the best practice to export canvas with high quality images? http://stackoverflow.com/questions/17025603/what-is-the-best-practice-to-export-canvas-with-high-quality-images you here remember you are working with a pixel device not vectors so the canvas need to be already in the size you want to use..
http://stackoverflow.com/questions/19732387/password-hashing-in-2013 byte key derived from the password and salt. Test vectors can be found here https www.ietf.org rfc rfc6070.txt This implementation..
How to test a site rigorously? http://stackoverflow.com/questions/2558970/how-to-test-a-site-rigorously
Historical security flaws of popular PHP CMS's? http://stackoverflow.com/questions/2951917/historical-security-flaws-of-popular-php-cmss possible. I'm generally aware of most of the usual attack vectors but I want to make sure that all the bases are covered so don't..
How can I determine a file's true extension/type programatically? http://stackoverflow.com/questions/481743/how-can-i-determine-a-files-true-extension-type-programatically filetypes you intend to use to avoid any attack vectors. Edit I see in PHP there are some tools to do this for you...
Are mysql_real_escape_string() and mysql_escape_string() sufficient for app security? http://stackoverflow.com/questions/5414731/are-mysql-real-escape-string-and-mysql-escape-string-sufficient-for-app-secu because I heard that these don't help against all attack vectors Looking for the advice of experts. EDIT Also what about LIKE..
Is it ever ok to store password in plain text in a php variable or php constant? http://stackoverflow.com/questions/568657/is-it-ever-ok-to-store-password-in-plain-text-in-a-php-variable-or-php-constant outside the webroot. The It Depends comes from what attack vectors would cause someone to have access to that password text and..
How to build a secure and RESTful service in PHP? http://stackoverflow.com/questions/5816233/how-to-build-a-secure-and-restful-service-in-php
Singular Value Decomposition (SVD) in PHP http://stackoverflow.com/questions/960060/singular-value-decomposition-svd-in-php words etc. The cosine of the angle between your resultant vectors is pretty popular. Latent Semantic Mapping pdf is by far the..
Libpuzzle Indexing millions of pictures? http://stackoverflow.com/questions/9703762/libpuzzle-indexing-millions-of-pictures compound indexes word position the set of possible similar vectors is dramatically reduced and in most cases no vector distance..
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