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function [tout, yout] = rk4 (ypfun. tspan, y0, h)% fixed step four
function [tout, yout] = rk4(ypfun, tspan, y0, h)
%定步长四阶Runge-Kutta法求常微分方程(组)数值解
%[tout,yout] = rk4( ypfun , tspan, y0,h)
% 这里字符串ypfun是用以表示f(t, y)的M文件名,
% tspan=[t0, tfinal]表示自变量初值t0和终值tf
% y0表示初值向量y0,h是步长。
% 输出列向量tout表示节点 (t0 , t1 , … , tn)
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