3 .
.
, ,
dx / dt = rx (1- X / k),(1)
k .
г (1) .
, (2)
X 0 X (t).
, (2) t X 0 ert, dx / dt = rx, t (1).
(1) .1.
:
X (1) dx / dt = rx, X;
X X k.
MATLAB-6 .
%********* ELABORATION of LOGHISTICs EQUATION *************
%********* ********************************
lear;
tlimit=[0, 10]; X0=[0.01];
[t,X]=ode45(@logeq,tlimit,X0);
plot(t,X)
%******** logeq.m ********************************
function dXdt=logeq(t,X)
dXdt=[ 1.5*X*(1-X/2) ];
lear; tlimit X0.
[t,X] ode45, - . ode45 , .
.
(1) logeq.m. r =1.5 k =2. , (2).
ճ .
1. .
2. .
3. r > 0, k > 0 X (0) > 0, X (0) < k X (0) > k.
4. .