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This algorithm utilized a mechanism like k-Nearest Neighbor (kNN) and a specialized ranking system to sort the members of the population, and select the next generation of population, from combination of current population and off-springs created by genetic. m function) with its input and output parameters. All these codes and data sets are used in our experiments. A new hybrid population-based algorithm (PSOGSA) is proposed with the combination of Particle Swarm Optimization (PSO) and Gravitational Search Algorithm (GSA). This algorithm is based on the Newtonian gravity: "Every particle in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them". MATLAB code for the article by Lilia Maliar and Serguei Maliar, (2005). The Phase Vocoder [FlanG66, Dols86, LaroD99] is an algorithm for timescale modification of audio. 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This algorithm utilized a mechanism like k-Nearest Neighbor (kNN) and a specialized ranking system to sort the members of the population, and select the next generation of population, from combination of current population and off-springs created by genetic. m function) with its input and output parameters. All these codes and data sets are used in our experiments. A new hybrid population-based algorithm (PSOGSA) is proposed with the combination of Particle Swarm Optimization (PSO) and Gravitational Search Algorithm (GSA). This algorithm is based on the Newtonian gravity: "Every particle in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them". MATLAB code for the article by Lilia Maliar and Serguei Maliar, (2005). The Phase Vocoder [FlanG66, Dols86, LaroD99] is an algorithm for timescale modification of audio. 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