清空筛选条件
清空筛选条件

How to determine the start time and the end time of the signal

10 次查看（过去 30 天）
Yew Jen Chong
Yew Jen Chong 2022-6-16
评论： Yew Jen Chong 2022-6-16
Hi, I want to find the start time and the end time of the signal as shown in figure below.
I tried using "findchangepts" command to identify the both time but the x-axis is incorrect. Is someone know what is the reason?
In addition, I also not sure how accurate it is by using this method.
findchangepts(signal.CurrentRMS_amp_,'MaxNumChanges',3, 'Statistic','rms')
Is there any methods to find the time accurately?
Any advice would be appreciated.
Thank you.

请先登录，再回答此问题。

采纳的回答

Sam Chak
Sam Chak 2022-6-16
Ran in:
Hi @Yew Jen Chong
Alternatively, try this. The findchangepts function actually works.
T = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1033920/signal.csv');
Warning: Column headers from the file were modified to make them valid MATLAB identifiers before creating variable names for the table. The original column headers are saved in the VariableDescriptions property.
Set 'VariableNamingRule' to 'preserve' to use the original column headers as table variable names.
t = T.(1);
y = T.(2);
ipt = findchangepts(y, 'MaxNumChanges', 10);
Tstart = t(ipt(1))
Tstart = 1.1100
Tfinal = t(ipt(end))
Tfinal = 1.6130
plot(t, y)
hold on
plot(Tstart, y(ipt(1)), 'ro', 'linewidth', 1.5, 'MarkerSize', 14)
plot(Tfinal, y(ipt(end)), 'ro', 'linewidth', 1.5, 'MarkerSize', 14)
xlim([1.05 1.65])

更多回答（1 个）

KSSV
KSSV 2022-6-16
Ran in:
T = readtable('https://in.mathworks.com/matlabcentral/answers/uploaded_files/1033920/signal.csv') ;
Warning: Column headers from the file were modified to make them valid MATLAB identifiers before creating variable names for the table. The original column headers are saved in the VariableDescriptions property.
Set 'VariableNamingRule' to 'preserve' to use the original column headers as table variable names.
t = T.(1) ;
x = T.(2) ;
idx = x>0.1 ;
plot(t,x,'r',t(idx),x(idx),'b')

类别

在 Help Center 和 File Exchange 中查找有关 Parametric Spectral Estimation 的更多信息

标签

产品


版本

R2021b

Community Treasure Hunt

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

Start Hunting!

Translated by