Π ΡΡΠΎΠΌ ΡΠ»ΡΡΠ°Π΅ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²ΠΎ ΠΆΠ΅ΡΡΠ² ΠΌΠ°Π»ΠΎ, Π° ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²ΠΎ Ρ
ΠΈΡΠ½ΠΈΠΊΠΎΠ² Π²Π΅Π»ΠΈΠΊΠΎ ΡΡΠΎ ΡΠ²ΡΠ·Π°Π½ΠΎ Ρ ΡΠ΅ΠΌ, ΡΡΠΎ ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½Ρ Ρ
ΠΈΡΠ½ΠΈΡΠ΅ΡΡΠ²Π°, Ρ. Π΅. ΡΠΊΠΎΡΠΎΡΡΡ, Ρ ΠΊΠΎΡΠΎΡΠΎΠΉ Π²ΡΡΡΠ΅ΡΠΈ Ρ
ΠΈΡΠ½ΠΈΠΊΠΎΠ² Ρ ΠΆΠ΅ΡΡΠ²Π°ΠΌΠΈ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡ Ρ
ΠΈΡΠ½ΠΈΠΊΠ°ΠΌ ΠΏΡΠΈΠ±Π°Π²Π»ΡΡΡ ΡΠΈΡΠ»Π΅Π½Π½ΠΎΡΡΡ ΡΠ²ΠΎΠ΅ΠΉ ΠΏΠΎΠΏΡΠ»ΡΡΠΈΠΈ, Π²ΡΡΠΎΠΊ (d Π² ΠΈΠ½ΡΠ΅ΡΠ²Π°Π»Π΅ ΠΎΡ 2,2 Π΄ΠΎ 3,5).
ΠΡΠΈΠΌΠ΅Ρ Π² Maple 9 ΠΏΡΠΈ d=2,2:
> V:=dsolve ({diff (x (t), t)=(4−3*y (t))*x (t), diff (y (t), t)=(-2+2.2*x (t))*y (t), x (0)=3,y (0)=1},{x (t), y (t)}, numeric);
> with (plots):odeplot (V,[[t, x (t)],[t, y (t)]], 0.10);
> odeplot (V,[x (t), y (t)], 0.2.8);
> eq1:={diff (x (t), t)=(4−3*y (t))*x (t), diff (y (t), t)=(-2+2.2*x (t))*y (t), x (0)=3,y (0)=1};
> res1:=dsolve (eq1,type=numeric, output=array ([0,0.5,1,1.5,2,2.5,3,3.5,4]));
ΠΡΠΈΠΌΠ΅Ρ Π² Maple 9 ΠΏΡΠΈ d=3:
> V:=dsolve ({diff (x (t), t)=(4−3*y (t))*x (t), diff (y (t), t)=(-2+3*x (t))*y (t), x (0)=3,y (0)=1},{x (t), y (t)}, numeric);
> with (plots):odeplot (V,[[t, x (t)],[t, y (t)]], 0.10);
> odeplot (V,[x (t), y (t)], 0.2.9);
> eq1:={diff (x (t), t)=(4−3*y (t))*x (t), diff (y (t), t)=(-2+3*x (t))*y (t), x (0)=3,y (0)=1};
> res1:=dsolve (eq1,type=numeric, output=array ([0,0.5,1,1.5,2,2.5,3,3.5,4]));
ΠΡΠΈΠΌΠ΅Ρ Π² Maple 9 ΠΏΡΠΈ d=3,5:
> V:=dsolve ({diff (x (t), t)=(4−3*y (t))*x (t), diff (y (t), t)=(-2+3.5*x (t))*y (t), x (0)=3,y (0)=1},{x (t), y (t)}, numeric);
> with (plots):odeplot (V,[[t, x (t)],[t, y (t)]], 0.10);
> odeplot (V,[x (t), y (t)], 0.3);
> eq1:={diff (x (t), t)=(4−3*y (t))*x (t), diff (y (t), t)=(-2+3.5*x (t))*y (t), x (0)=3,y (0)=1};
> res1:=dsolve (eq1,type=numeric, output=array ([0,0.5,1,1.5,2,2.5,3,3.5,4]));
ΠΠΎΠ»ΠΈΡΠ΅ΡΡΠ²ΠΎ Ρ
ΠΈΡΠ½ΠΈΠΊΠΎΠ² Π·Π½Π°ΡΠΈΡΠ΅Π»ΡΠ½ΠΎ ΠΏΡΠ΅Π²ΡΡΠ°Π΅Ρ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²ΠΎ ΠΆΠ΅ΡΡΠ²
Π ΡΡΠΎΠΌ ΡΠ»ΡΡΠ°Π΅ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²ΠΎ ΠΆΠ΅ΡΡΠ² ΠΌΠ°Π»ΠΎ, Π° ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²ΠΎ Ρ
ΠΈΡΠ½ΠΈΠΊΠΎΠ² Π²Π΅Π»ΠΈΠΊΠΎ ΡΡΠΎ ΡΠ²ΡΠ·Π°Π½ΠΎ Ρ ΡΠ΅ΠΌ, ΡΡΠΎ ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½Ρ Ρ
ΠΈΡΠ½ΠΈΡΠ΅ΡΡΠ²Π°, Ρ. Π΅. ΡΠΊΠΎΡΠΎΡΡΡ, Ρ ΠΊΠΎΡΠΎΡΠΎΠΉ Π²ΡΡΡΠ΅ΡΠΈ Ρ
ΠΈΡΠ½ΠΈΠΊΠΎΠ² Ρ ΠΆΠ΅ΡΡΠ²Π°ΠΌΠΈ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡ Ρ
ΠΈΡΠ½ΠΈΠΊΠ°ΠΌ ΠΏΡΠΈΠ±Π°Π²Π»ΡΡΡ ΡΠΈΡΠ»Π΅Π½Π½ΠΎΡΡΡ ΡΠ²ΠΎΠ΅ΠΉ ΠΏΠΎΠΏΡΠ»ΡΡΠΈΠΈ, Π²ΡΡΠΎΠΊ (d ΠΎΠΊΠΎΠ»ΠΎ 4).
ΠΡΠΈΠΌΠ΅Ρ Π² Maple 9 ΠΏΡΠΈ d=4:
> V:=dsolve ({diff (x (t), t)=(4−3*y (t))*x (t), diff (y (t), t)=(-2+4*x (t))*y (t), x (0)=3,y (0)=1},{x (t), y (t)}, numeric);
> with (plots):odeplot (V,[[t, x (t)],[t, y (t)]], 0.10);
> with (plots):odeplot (V,[t, x (t)], 0.5.2);
> odeplot (V,[x (t), y (t)], 0.3.6);
> eq1:={diff (x (t), t)=(4−3*y (t))*x (t), diff (y (t), t)=(-2+4*x (t))*y (t), x (0)=3,y (0)=1};
> res1:=dsolve (eq1,type=numeric, output=array ([0,0.5,1,1.5,2,2.5,3,3.5,4]));