clc;clear all;close all; % 初始參數I = 10; sigma = 0.04;beta = 5;gamma = 140; a = 0.02;b = 0.2; c = -65;d = 2; % 步長，改進歐拉法的相關參數 step = 0.1; timeConter = 0:step:1000; v = zeros(1,length(timeConter)); u = zeros(1,length(timeConter)); v(1) = -65;%v(2) = -60; u(1) = 1;%u(1) = 1;for i_conter = 2:length(timeConter)K1_1 = sigma*v(i_conter-1)^2+beta*v(i_conter-1)+gamma-u(i_conter-1)+I;vpn = v(i_conter-1)+step*(sigma*v(i_conter)^2+beta*v(i_conter)+gamma-u(i_conter)+I);K2_1 = sigma*vpn^2+beta*vpn+gamma-u(i_conter)+I;v(i_conter) = v(i_conter-1)+step/2*(K1_1+K2_1);% K1_1 = sigma*v(i_conter-1)^2+beta*v(i_conter-1)+gamma+I; % vpn = v(i_conter-1)+step*(sigma*v(i_conter)^2+beta*v(i_conter)+gamma+I); % K2_1 = sigma*vpn^2+beta*vpn+gamma+I; % v(i_conter) = v(i_conter-1)+step/2*(K1_1+K2_1);K2_1 = a*(b*v(i_conter-1)-u(i_conter-1));upn = u(i_conter-1)+step*(a*(b*v(i_conter)-u(i_conter)));K2_2 = a*(b*v(i_conter)-upn);u(i_conter) = u(i_conter-1)+step/2*(K2_1+K2_2);if(v(i_conter)>30)v(i_conter) = c;u(i_conter) = u(i_conter)+d;end endplot(timeConter,v) % figure(2) % plot(timeConter,u)

D210

總結

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