清空筛选条件
清空筛选条件

how i can found the region of absolute stability ?

8 次查看（过去 30 天）
sadeem alqarni
sadeem alqarni 2018-7-7
评论： sadeem alqarni 2018-7-8
n=0:30:180
h=((768 *cos((1/2)*n) + 96* cos(n) - 864) ./ (40*cos (1/2*n)+ 2*cos(n)+ 102))
figure
plot(n,h, 'b*-', 'LineWidth', 2)
grid on;
xlabel('n', 'FontSize', 20);
ylabel('h', 'FontSize', 20);

请先登录，再回答此问题。

采纳的回答

Image Analyst
Image Analyst 2018-7-7
Because you're using / (array division) instead of ./ (element by element division). Try this:
n=0:30:180
h=((768 *cos((1/2)*n) + 96* cos(n) - 864) ./ (40*cos (1/2*n)+ 2*cos(n)+ 102))
figure
plot(n,h, 'b*-', 'LineWidth', 2)
grid on;
xlabel('n', 'FontSize', 20);
ylabel('h', 'FontSize', 20);
% Do it again with more resolution.
n = linspace(min(n), max(n), 1000);
h=((768 *cos((1/2)*n) + 96* cos(n) - 864) ./ (40*cos (1/2*n)+ 2*cos(n)+ 102))
hold on;
plot(n,h, 'r-', 'LineWidth', 2)
grid on;
xlabel('n', 'FontSize', 20);
ylabel('h', 'FontSize', 20);

更多回答（2 个）

sadeem alqarni
sadeem alqarni 2018-7-8
how i can found the region of absolute stability ?
  2 个评论
Image Analyst
Image Analyst 2018-7-8
How is this an "Answer" to your original question? Anyway, as you can see from my plot, it depends on how you define stable. The values are constantly changing so they're not stable, however the overall pattern seems pretty stable - it seems to oscillate pretty much the same way over the time period plotted.

请先登录，再进行评论。

sadeem alqarni
sadeem alqarni 2018-7-8

类别

在 Help Center 和 File Exchange 中查找有关 Title 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by