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Calculation. The geometric mean of a data set {,, …,} is given by: (=) =.The above figure uses capital pi notation to show a series of multiplications. Each side of the equal sign shows that a set of values is multiplied in succession (the number of values is represented by "n") to give a total product of the set, and then the nth root of the total product is taken to give the geometric mean ...
RedBeanPHP is an independent, free, BSD licensed, open-source object–relational mapping (ORM) software written by Gabor de Mooij. It is a stand-alone library, not part of any framework. RedBeanPHP is an on-the-fly object–relational mapper, this means there is no upfront configuration. The system relies on conventions entirely and adapts the ...
Login spoofings are techniques used to steal a user's password. [1] [2] The user is presented with an ordinary looking login prompt for username and password, which is actually a malicious program (usually called a Trojan horse) under the control of the attacker. When the username and password are entered, this information is logged or in some ...
Linear programming is a special case of mathematical programming (also known as mathematical optimization ). More formally, linear programming is a technique for the optimization of a linear objective function, subject to linear equality and linear inequality constraints. Its feasible region is a convex polytope, which is a set defined as the ...
In the field of databases in computer science, a transaction log (also transaction journal, database log, binary log or audit trail) is a history of actions executed by a database management system used to guarantee ACID properties over crashes or hardware failures. Physically, a log is a file listing changes to the database, stored in a stable ...
Logarithmic scale. of the Internet host count over time shown on a logarithmic scale. A logarithmic scale (or log scale) is a method used to display numerical data that spans a broad range of values, especially when there are significant differences between the magnitudes of the numbers involved. Unlike a linear scale where each unit of ...
The log-distance path loss model is a radio propagation model that predicts the path loss a signal encounters inside a building or densely populated areas over distance. Mathematical formulation [ edit ]
Query by Example (QBE) is a database query language for relational databases. It was devised by Moshé M. Zloof at IBM Research during the mid-1970s, in parallel to the development of SQL . [1] It is the first graphical query language, using visual tables where the user would enter commands, example elements and conditions.