Реферат: Численный расчет дифференциальных уравнений

readln(v[i]);

if n=3 then begin

yx[0]:=v[0];

ay[0]:=v[1];

by[0]:=v[2];

p[0]:=(k*c-l[0]*v[0]-l[1]*v[1]-l[2]*v[2])/l[3];

x[0]:=c;

gotoxy(32,1);

write('');

gotoxy(32,2);

write(' x y a b ');

gotoxy(32,3);

write('',c:7:7,' ',yx[0]:7:7,' ',ay[0]:7:7,' ',by[0]:7:7,' ');

for i:=0 to o-1 do begin

x[i]:=x[i]+h/2;

y[i,1]:=yx[i]+(h/2)*ay[i];

a[i,1]:=ay[i]+(h/2)*by[i];

b[i,1]:=by[i]+(h/2)*p[i];

ff[i]:=(k*x[i]-l[0]*y[i,1]-l[1]*a[i,1]-l[2]*b[i,1])/l[3];

xy[i]:=x[i]+h/2;

yx[i+1]:=yx[i]+h*a[i,1];

ay[i+1]:=ay[i]+h*b[i,1];

by[i+1]:=by[i]+h*ff[i];

x[i+1]:=x[i]+h/2;

p[i+1]:=(k*xy[i]-l[0]*yx[i+1]-l[1]*ay[i+1]-l[2]*by[i+1])/l[3];

end;

for i:=0 to o-1 do begin

gotoxy(32,4+i);

write(' ',xy[i]:7:7,' ',yx[i+1]:7:7,' ',ay[i+1]:7:7,' ',by[i+1]:7:7,' ');