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php Programming Glossary: formula

How to evaluate formula passed as string in PHP?

http://stackoverflow.com/questions/1015242/how-to-evaluate-formula-passed-as-string-in-php

to evaluate formula passed as string in PHP Just trying to figure out the proper.. It could be used to generate graphs from expressions of formulae. EvalMath PHP Class to safely evaluate math expressions..

Algorithm to get all possible string combinations from array up to certain length

http://stackoverflow.com/questions/12293870/algorithm-to-get-all-possible-string-combinations-from-array-up-to-certain-lengt

similarly using q 0 instead of m to find a 1 etc. This formula can be broken down into two cases m mod k 0 a 0 k and q 0 m.. algorithm. For any integer m we can iteratively apply this formula until the resulting q p 0. Also note that the conversion is.. remainder for int i 1 i n i int current i m and q_n in the formula String combination do remainder current b if remainder 0 combination..

Crop image in PHP

http://stackoverflow.com/questions/1855996/crop-image-in-php

aspect ratio of the image won't change. Here's a general formula for creating thumbnails image imagecreatefromjpeg _GET 'src'..

Formulas to Calculate Geo Proximity

http://stackoverflow.com/questions/2096385/formulas-to-calculate-geo-proximity

my application but I'm very confused regarding the correct formula to use. After some searches in the Web and in StackOverflow.. POWER SIN PI COS I've also seen variations from the same formula Spherical Law of Cosines like this one 3956 ACOS COS RADIANS.. ACOS COS RADIANS SIN I am not a math expert but are these formulas the same I've come across some more variations and formulas..

Force PHP integer overflow

http://stackoverflow.com/questions/300840/force-php-integer-overflow

integers has changed. Basically we are using following formula function f x1 x2 x3 x4 return x1 x2 ^ x3 x4 However even with..

PHP HSV to RGB formula comprehension

http://stackoverflow.com/questions/3597417/php-hsv-to-rgb-formula-comprehension

HSV to RGB formula comprehension I can convert RGB values to HSV with the following..

Geo-Search (Distance) in PHP/MySQL (Performance)

http://stackoverflow.com/questions/5236921/geo-search-distance-in-php-mysql-performance

I select from based on the pairs distance great circle formula from another lat long pair. e.g. all entries that are within.. all 200k entries every time and perform the great circle formula for every entry. I read something about geohashing R Trees and.. Or would PostgreSQL too simply just use the great circle formula to get all entries within a certain region Is there maybe a..

Permutations - all possible sets of numbers

http://stackoverflow.com/questions/5506888/permutations-all-possible-sets-of-numbers

of combinatorics as I have long forgotten it. What was formula to calc how many combination will there be Example sets 0 1.. this question You're looking for the permutations formula nPk n n k In your case you have 9 entries and you want to choose..

MySQL Great Circle Distance (Haversine formula)

http://stackoverflow.com/questions/574691/mysql-great-circle-distance-haversine-formula

Great Circle Distance Haversine formula I've got a working PHP script that gets Longitude and Latitude..

Formulas to Calculate Geo Proximity

http://stackoverflow.com/questions/2096385/formulas-to-calculate-geo-proximity

to Calculate Geo Proximity I need to implement a Geo proximity.. I found that the solutions are Use the Haversine Formula Use the Great Circle Distance Formula Use a Spatial Search Engine.. Use the Haversine Formula Use the Great Circle Distance Formula Use a Spatial Search Engine in the Database Option #3 is really..