Octave绘图：函数图像、包络线与子图绘制全攻略

以下是使用 Octave 实现上述任务的代码： ```octave % 任务 1 x = linspace(0, 4*pi, 1000); y1 = exp(x/3).*sin(3*x); y2 = exp(x/3); y3 = -exp(x/3); figure plot(x, y1, 'b*') hold on plot(x, y2, 'r:') plot(x, y3, 'r:') title('Task 1') xlabel('x') ylabel('y') legend('y = exp(x/3) * sin(3*x)', 'y = exp(x/3)', 'y = -exp(x/3)') % 任务 2 figure subplot(3, 1, 1) x1 = linspace(-pi, pi, 1000); y1 = x1.*cos(x1); plot(x1, y1) title('y = x*cos(x), x in (-pi, pi)') xlabel('x') ylabel('y') subplot(3, 1, 2) x2 = linspace(pi, 4*pi, 1000); y2 = x2.*tan(1/x2).*sin(x2^3); plot(x2, y2) title('y = x*tan(1/x) * sin(x^3), x in (pi, 4*pi)') xlabel('x') ylabel('y') subplot(3, 1, 3) x3 = linspace(1, 8, 1000); y3 = exp(1/x3).*sin(x3); plot(x3, y3) title('y = exp(1/x) * sin(x), x in [1, 8]') xlabel('x') ylabel('y') % 任务 3 theta = linspace(1, 10, 1000); phi = exp(-2*theta/3).*sin(1 + 2*theta); figure fplot(@(theta) exp(-2*theta/3).*sin(1 + 2*theta), [1, 10]) title('Function Plot') xlabel('theta') ylabel('phi') ``` 额外注意逻辑点： 1. 注意数据点的数量，以保证图像的平滑性。 2. 检查函数表达式的准确性，避免计算错误。 3. 调整图像的坐标轴范围和刻度，使图像显示清晰。 ######[AI写代码神器 | 589点数解答 | 2025-03-12 16:36:51]