MATLAB: Get envelope of multiples curve

curveenvelope

Dear all Any idea about the envelope of 2 or more curves via Matlab; Please see the attached Xls file Thanks

Best Answer

With your data, I would simply use the min and max functions:

d = xlsread('Lila wagou 3_Curves.xlsx');
t = d(:,1);
data = d(:,2:end);
env = [min(data,[],2)  max(data,[],2)];
figure(1)
plot(t, data)
hold on
plot(t, env(:,1), '-g', 'LineWidth',2)
plot(t, env(:,2), '-g', 'LineWidth',2)
hold off
grid

Related Solutions

MATLAB: Please anyone help me to plot the graph(load against extension) from the raw data(excel) and calculate the area under the graph of it

This should work:

[D,S] = xlsread('Al 1.csv');
Ext = D(:,2);
Load = D(:,3);
AUC = cumtrapz(Ext, Load);                                  % Area Under Curve (Cumulative Integral)
figure(1)
plot(Ext, Load)
hold on
plot(Ext, AUC)
hold off
grid
xlabel('Extension (mm)')
ylabel('Load (kN)')
legend('Data', 'Cumulative Area Under Curve (kN\cdotmm)', 'Location','NW')
text(5, 25, sprintf('Total Area Under Curve = %.3f kN\\cdotmm', AUC(end)))

MATLAB: How extracted envelop signal in matlab 2013

Use the hilbert function, specifically:

DbEnv = abs(hilbert(Db));

Example —

t = 0:0.01:5;                                                       % Create Data

s = sin(2*pi*t) .* cos(2*pi*10*t);                                  % Create Data
psenv = abs(hilbert(s));                                            % Upper Envelope
nsenv = abs(hilbert(-s));                                           % Lower Envelope
figure
plot(t, s, 'LineWidth',1.5)
hold on
plot(t,  psenv, '-r', 'LineWidth',2)
plot(t, -nsenv, '-g', 'LineWidth',2)
hold off
grid
legend('Signal','Upper Envelope','Lower Envelope', 'Location','N')

Best Answer

Related Solutions

MATLAB: Please anyone help me to plot the graph(load against extension) from the raw data(excel) and calculate the area under the graph of it

MATLAB: How extracted envelop signal in matlab 2013

Related Question