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Second Order Runge-Kutta Method for Problem

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David Geistlinger
David Geistlinger 2019-11-8
编辑： Jeremy 2019-11-8
4a.PNG
I am trying to generate a second order Runge Kutta method in matlab for the above problem and not sure where to start. Tried asking for help but was shown Mathematica code and example and I dont have Mathematica. Any help would be appreicated.

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回答（1 个）

Jeremy
Jeremy 2019-11-8
The ode solvers built into MATLAB are based on the runge-kutta method. Are you meant to implement your own method, or can you use ode23?
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David Geistlinger
David Geistlinger 2019-11-8
Can use existing method im just not sure how to use the runge kutta method in matlab
Jeremy
Jeremy 2019-11-8
编辑：Jeremy 2019-11-8
I would encourage you to read the documentation. Here is some syntax, if I read your problem correctly this should be the solution to the first part of your problem using ode23:
dxdt = @(t,x) 0.02 - 0.01*sqrt(x);
x0 = 0;
tspan = [0 600];
sol = ode23(dxdt,tspan,x0);
plot(sol.x,sol.y)
Also, please look at this:
doc ode23

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