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【转自：http://blog.csdn.net/fendoubasaonian/article/details/52974608】 %JOINT Summary of this function goes here % Detailed explanation goes here t1 = linspace(-10,10,500); t2 = linspace(-10,10,500); t3 = linspace(-10,10,500); % zhx = -12.1*sin(2*pi*(time-0.25))-abs(12.1*sin(2*pi*(time-0.25))); % zhx = 0; a = 1; c = 0; % sigmod & tanh sigmod = sigmf(t1,[a c]) tan_h = tanh(t2); max_f = max(0,t3); %激活函数 subplot(2,2,1); plot(t1, sigmod,'r-'); legend('sigmoid') title('sigmoid函数') axis([-10, 10, -1, 1]) % 坐标轴的显示范围 set(gca, 'XGrid','on'); % X轴的网格 set(gca, 'YGrid','on'); % Y轴的网格 subplot(2,2,2); plot(t2,tan_h,'b-'); legend('tanh') title('tanh函数') axis([-10, 10, -1, 1]) % 坐标轴的显示范围 set(gca, 'XGrid','on'); % X轴的网格 set(gca, 'YGrid','on'); % Y轴的网格 subplot(2,2,3); plot(t3,max_f,'c-'); legend('max(0,x)') title('max(0,x)函数') axis([-10, 10, -10, 10]) % 坐标轴的显示范围 set(gca, 'XGrid','on'); % X轴的网格 set(gca, 'YGrid','on'); % Y轴的网格