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python: intro to solve with python , ode(finite difference),version 1.0
peter.vlasschaert@gmail.com,31/08/2022                                 
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vibration ode : diff(u,t,2)+w^2*u = 0 ,ic :diff(u,t=0) = r,u(0)  =1,finite difference : maxima doc.
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 model with : r=0 
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plot2d,r,exact solution ,close *
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plot2d.r--,finite difference,close *
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