I am Facing problem using ode45

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Muhammad Usman
Muhammad Usman 2014-6-27
评论： Muhammad Usman 2014-6-27
I wrote this in m-file...
function dx=FtnTest(t,x)
dx=zeros(2,1);
dx(1)=x(2);
dx(2)=-52.1480*(-63.8398)*x(2)-(-4.6941e+06)*x(1);
and use
[t,x]=ode45('FtnTest',[0,100],[0,0])
in command window but it generates only the zero column vectors,please guide me about the error...
Thanks

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Roger Stafford
Roger Stafford 2014-6-27
That is no error. A zero vector is the correct solution to the equations and their zero initial values which you have given them. If the original equation had been
dx(2)=-52.1480+(-63.8398)*x(2)-(-4.6941e+06)*x(1);
with addition instead of multiplication in the leftmost operation, then you would obtain a different result. It looks as though that is what you might have meant.

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