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Torsten
Posts:
1,605
Registered:
11/8/10


Re: simultaneous differential equations
Posted:
Mar 15, 2013 9:49 AM


"Bonny Nguyen" wrote in message <khv7qr$s1f$1@newscl01ah.mathworks.com>... > Dear everybody, > I have a problem when compute simultaneous differential equations follow that: > A, B, C, D are variable M =[m11 m12 m13 m14; m21... m24; m31..m34; m41...m44] is matrix , and also m11, m12.... m44 are number matrix > eqution: > dA/dz = m11A + m12B + m13C + m14D > dB/dz = m21A + m22B + m23C + m24D > dC/dz = m31A + m32B + m33C + m34D > dD/dz = m41A + m42B + m43C + m44D > in this case, z=1:0.1:301 > for instance, m11=K11*cos((2*pi/5e7)*z) > K11=constant > > Please help me haw can I solve this simultaneous differential equations in Matlab, > Thank you so much > > Sincerely,
You can use one of the ODE integrators (ode45, ode15s,...), interprete z as t in the notation of the integrators and set up your problem in a standard way. Take a look at the examples provided. Or what exactly is your problem ?
Best wishes Torsten.



