plotting the correct position of maximum

Question

Muhannad AL-hazmi 2020-10-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/608016-plotting-the-correct-position-of-maximum

评论： Ameer Hamza 2020-10-8

Hello

can you correct my code to find the right position of the max in the plot as you can see in the figure it's shifted to the right

clear;clc;
num = [0.1 0.35 0];
den = [1 3 2];
sys = tf(num,den)
figure();
step(sys);
grid
title('Respond of sytem Subjected to initial Conditoin')
xlabel('t')
ylabel('Output x(t)')
hold on;
max1 = max(step(sys));
min1 = min(step(sys));
plot(max1,'o')
plot(min1,'o')
legend('y(x)', sprintf('Maximum y = %0.4f',max1),sprintf('Minumum y = %0.3f',min1))

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Answer 1

Ameer Hamza 2020-10-8

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/608016-plotting-the-correct-position-of-maximum#answer_508321

编辑：Ameer Hamza 2020-10-8

在 MATLAB Online 中打开

You also need to specify the time value in plot(). Try this

num = [0.1 0.35 0];
den = [1 3 2];
sys = tf(num,den);
figure();
step(sys);
[y, t] = step(sys);
grid
title('Respond of sytem Subjected to initial Conditoin')
xlabel('t')
ylabel('Output x(t)')
hold on;
[max1, idx1] = max(y);
[min1, idx2] = min(y);
plot(t(idx1), max1,'o')
plot(t(idx2), min1,'o')
legend('y(x)', sprintf('Maximum y = %0.4f',max1),sprintf('Minumum y = %0.3f',min1))