How to reduce the running time using dsolve
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Hello,
I would like to solve ode using dsolve function. It was mainly to analyse the system behavior by step input.
The equation that I want to solve looks like the following.. A*D4(y(t)) + B*D3(y(t)) + C*D2(y(t)) + D = E*D2(u(t)) + F*(D(u(t))) + G*(u(t))
which u(t) : Step function Boundary Condition : y(0) = 0, y(0.1) = 0, y(0.5) = 0, Dy(0) = 0
Details are attached as a m-file.
When I run this code in Matlab, it runs without end. Instead of u(t) as a step function (using heaviside), I have also tried u(t)= 1./(1+exp(-(t-1)/0.05)); as well but it was also running without an end.
Are there any suggestions that enables to solveo this equations?
I will be very glad to hear some tips..
Thanx for reading.
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2015-4-20
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