Time steps in integration

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Richard
Richard 2012 年 4 月 4 日
I am confused. I think that ode45 uses a variable time step determined by the tolerance settings. But programs using ode45 tend to also specify the time steps , something like
tspan = (a,b,n);
But what is the point in doing so? Does changing n do anything to the accuracy of the output?
Anyone?

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