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Subject: Simple ODE: Linearly Damped Spring Mass System
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In Matlab, How can I solve a Linear Second Order Homogenous ODE in Matrix form, i.e. 

M x&#8217;&#8217; + C x&#8217; + k x = 0
Where M, C, K are 6x6 complex matrices, and x is a function of time. 
and some initial conditions, i.e.  x(0)=1. 

I cannot find references that address this problem in the matrix form. Any tips will be appricated. Thanks,