PSO Pseudo Code

The pseudo code of the procedure is as follows



For each particle 
    Initialize particle
END

Do
    For each particle 
        Calculate fitness value
        If the fitness value is better than the best fitness value (pBest) in history
            set current value as the new pBest
    End

    Choose the particle with the best fitness value of all the particles as the gBest
    For each particle 
        Calculate particle velocity according equation (a)
        Update particle position according equation (b)
    End 

While maximum iterations or minimum error criteria is not attained

Particles' velocities on each dimension are clamped to a maximum velocity Vmax. If the sum of accelerations would cause the velocity on that dimension to exceed Vmax, which is a parameter specified by the user. Then the velocity on that dimension is limited to Vmax.


source: http://www.swarmintelligence.org/tutorials.php