Newmark

 NEWMARK'S METHOD : LINEAR SYSTEM
 Reference : Dynamics of Structures - Anil K. Chopra
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 Purpose : Dynamic Response of a system using linear Newmark's Method
 Synopsis :
       [depl,vel,accl,t] = Newmark(M,K,C,P,acceleration)

 Variable Description :
 INPUT :
       M - Mass Matrix (in modal coordinates)
       K - Stiffness Matrix (in modal coordinates)
       C - Damping Matrix (in modal coordinates)
       P - Force Matrix (in modal coordinates)
       acceleration - Type of Newmark's Method to be used

 OUTPUT :
        depl - modal displacement's
        vel - modal velocities
        accl - modal accelerations
        t - time values at which integration is done
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