Системы дифференциальных уравнений

restart; Ordev=6:a:=-0,08:
> b:=1/9:
> sys:=diff(x(t),t)=y(t),
> diff(y(t),t)=-a*t*y(t)-x(t):
> cond:=x(0)=0, y(0)=b:
> de:=dsolve({sys,cond},{x(t),y(t)},numeri c);
>
>
>

de := proc(rkf45_x) ... end proc

> odeplot(de,[x,y(x)],-10..10,thickness=2);

d d
odeplot(-- x(t) = y(t), -- y(t) = -(0, 8) t y(t) - x(t), [x, y(x)],
dt dt

-10 .. 10, thickness = 2)

> dsolve({sys},{x(t),y(t)});
> y1:=rhs(%):

{y(t) = _C1 cos(t) - _C2 sin(t), x(t) = _C1 sin(t) + _C2 cos(t)}

Error, wrong number (or type) of parameters in function rhs

> dsolve({sys},{y(t),x(t)}, series);



> y2:=rhs(%):
Error, wrong number (or type) of parameters in function rhs

> convert(%, polynom):=rhs(%):
> p1:=odeplot(de,[x,y(x)],-2..3, thickness=2, color=black):
> p2:=plot(p,x=-2..3,thickness=2,linestyle=3, color=blue):
> display(p1,p2);
Error, wrong number (or type) of parameters in function rhs


display(

odeplot(de, [x, y(x)], -2 .. 3, thickness = 2, color = black)

, PLOT(AXESLABELS("x", ""), COLOUR(RGB, 0., 0., 1.00000000),

THICKNESS(2), LINESTYLE(3), VIEW(-2. .. 3., DEFAULT)))

>
>