求助：ode 运算中matlab busy的问题

[jy00295005]

我在用ode45时matlab显示busy，不知大家有没有心得，该怎么解决，我把代码贴出来看下，variables比较多。帮忙看下。

function：
function [dy] = rate_equation3(t,y)

dy = zeros(4,1);

Gn = 2.2e-19;
gcf=5.2e-20; %gcf=gain compression factor
cff=0.746; %confinement factor
alpha=6.5; %linewidth enhancemnet factor
q = 1.6e-19; % electron charge
v = 3.75e-14; % modal volume
I = 2.5; %constant input current
tua_p = 2.05e-12; %photo life time
tua_e = 0.126e-9; %carrier life time
N0 = 3.0e21; %carrier density at transparency
g = Gn*(y(2)-N0)*(1-gcf*y(3)); %nonliear gain expression

%E(t)
dy(1)=0.5*(cff*g-1/tua_p)*y(1)+i*alpha/2*(cff*gcf*(y(2)-N0)-tua_p)*y(1);
%N(t)
dy(2)=I/(q*v)-y(2)/tua_e-g*y(3);
%S(t)
dy(3)=abs(y(1).^2);
%phase
dy(4)=unwrap(angle(y(1)));

call function：
clc
clear all
close all


TSPAN = [0 5];
Y0 =[0 0 0 0];

[T,Y] = ODE45(@rate_equation3,TSPAN,Y0);

figure(1)

subplot(2,1,1)
plot(T ,Y(:,1))
title('plot of ')

subplot(2,1,2)
plot(T,Y(:,2))
title('plot of ')

figure(2)
subplot(2,1,1)
plot(T ,Y(:,3))
tittle('plot')

subplot(2,1,2)
plot(T ,Y(:,4))
tittle('plot')