:
(27.1)
[x0,xn], y(x0)=y0.
(27.1) [x0,xn] n h:
xi+1=xi+h, i=0,1,2,,n-1 (27.2)
yi.
. yi :
yi+1=yi+h×f(xi,yi) (27.3)
1. n, xn, x0 ( x ), y0 ( y ).
2. h= , x=x0, y=y0.
3. x, y.
4. y=y+h×f(x,y), x=x+h.
5. x>xn, 6, 3.
6. .
h , x y. , , − .
-. - :
k1=h×f(xi,yi)
k2=h×f(xi+ , yi+ )
k3=h×f(xi+ , yi+ )
k4=h×f(xi+h, yi+k3)
yi+1=yi+ ×(k1+2×k2+2×k3+k4) (27.4)
xi+1=xi+h, i=0,1,2,, n-1
, - , , .