Question: Weird answer from invlaplace

Hi, I'm getting a weird answer for this problem.  It is a linear 3 mass four spring system between two rigid walls, and x(t), y(t), and z(t) are the horizonatl positions of the three masses.  Here's an what it looks like with the postive coordinate directions below each mass:

wall\\ ---spring---MASS---spring---MASS---spring---MASS---spring---\\wall

                           --->x                --->y                --->z

 

I've attached the file, it's only eight commands long.

 

Thanks for the help!

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