how can I change my time so that it takes frequency 1/250 hz

4 次查看（过去 30 天）
Manav Divekar
Manav Divekar 2021-10-20
回答： Star Strider 2021-10-20
clc
clear all
close all
C = readtable('G2_adolescent.txt', 'NumHeaderLines',8);
%Convert to SI Units
accG2test = C{:,1}.*9.81;
forceG2test = C{:,2}.*0.00981;
dispG2test = C{:,3}./1000;
% time = dispG2test./accG2test;
forceG2test2 = smoothdata(forceG2test, 'sgolay', 100);
% Valleys Of Smoothed Data
[Vlys,vlocs] = findpeaks(-forceG2test2, 'MinPeakProminence',0.5);
Vlys = [-forceG2test2(1); Vlys];
vlocs = [1;vlocs];
% Sampling Interval
Ts = 1;
t = 1:height(C);
figure
plot(t, forceG2test2)
hold on
plot(t(vlocs), -Vlys, '+r')
hold off
for k = 1:numel(vlocs)-1
% Index Range For This Segment
idx{k} = vlocs(k):vlocs(k+1);
% Time Vector
tc{k} = t(idx{k});
% Signal Segment
sc{k} = forceG2test(idx{k});
end
% Maximum Segment Length
tcmax = max(cellfun(@numel,tc));
% Preallocate
ensb = zeros(tcmax,numel(idx));
for k = 1:numel(idx)
% Create 'Ensemble'
ensb(1:numel(idx{k}),k) = sc{k};
end
figure
% Plot Ensemble
plot(1:tcmax, ensb)
title ('C:Force Vs Time (Cycles)');
legend('1','2','3','4','5','6','7','8','9');
xlabel('Time[sec]');
ylabel('Force[N]');
  2 个评论
Image Analyst
Image Analyst 2021-10-20
I'm not sure what the question means "how can I change my time so that it takes frequency 1/250 hz". How does a time "take" a frequency? A frequency of (1/250) Hz means the period is 250 seconds. Do you want the x axis to go from 0 seconds to 250 seconds?

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Star Strider
Star Strider 2021-10-20
Ran in:
If is the sampling interval, multiply it by the sampling instants to convert them to time —
C = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/773388/G2_adolescent.txt', 'NumHeaderLines',8);
%Convert to SI Units
accG2test = C{:,1}.*9.81;
forceG2test = C{:,2}.*0.00981;
dispG2test = C{:,3}./1000;
% time = dispG2test./accG2test;
forceG2test2 = smoothdata(forceG2test, 'sgolay', 100);
% Valleys Of Smoothed Data
[Vlys,vlocs] = findpeaks(-forceG2test2, 'MinPeakProminence',0.5);
Vlys = [-forceG2test2(1); Vlys];
vlocs = [1;vlocs];
% Sampling Interval
% Ts = 1;
Ts = 1/250; % Define Sampling Interval
t = 1:height(C);
t = t * Ts; % Multiply 't' By 'Ts' To Convert Samples To Time
figure
plot(t, forceG2test2)
hold on
plot(t(vlocs), -Vlys, '+r')
hold off
for k = 1:numel(vlocs)-1
% Index Range For This Segment
idx{k} = vlocs(k):vlocs(k+1);
% Time Vector
tc{k} = t(idx{k});
% Signal Segment
sc{k} = forceG2test(idx{k});
end
% Maximum Segment Length
tcmax = max(cellfun(@numel,tc));
% Preallocate
ensb = zeros(tcmax,numel(idx));
for k = 1:numel(idx)
% Create 'Ensemble'
ensb(1:numel(idx{k}),k) = sc{k};
end
figure
% Plot Ensemble
plot(t(1:tcmax), ensb) % Subscript 't' To Show Time, Not Samples
% plot(1:tcmax, ensb)
title ('C:Force Vs Time (Cycles)');
legend('1','2','3','4','5','6','7','8','9');
xlabel('Time[sec]');
ylabel('Force[N]');
.

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Design Condition Indicators Interactively 的更多信息

标签

产品

Community Treasure Hunt

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

Start Hunting!

Translated by