How can I change this code to plot finger below

Code:

clc;
clear all;
close all;

fs = 1000;
t = 0:1/fs:0.2;

Vm = 720; % Volt
f0 = 50 ;% Hz
q = 0.5 ; % Voltage Gain
alpha = 0;

Va = Vm*q*cos(2*pi*f0*t + alpha);

Vb = Vm*(q + 0.2*q*(t == 0.1)).*cos(2*pi*f0*t + alpha);

figure,
plot(t,Va,'r',t,Vb,'b');
xlabel('Time');
ylabel('Va and Vb');

[Rik]

You mean you need the legend function?

[Yasir Ghazi]

No,I not need the legend function but I need to the voltage will continue to rise after t=0.1s

[Walter Roberson]

Do you mean like

Vb = Vm*(q + 0.2*q*(t >= 0.1)).*cos(2*pi*f0*t + alpha);

Answer 1

[Image Analyst]

Finger below? Try this:

clc;
clear all;
close all;

fs = 1000;
t = 0:1/fs:0.2;

Vm = 720; % Volt
f0 = 50 ;% Hz
q = 0.5 ; % Voltage Gain
alpha = 0;

Va = Vm*q*cos(2*pi*f0*t + alpha);
Vb = Vm*(q + 0.2*q*(t == 0.1)).*cos(2*pi*f0*t + alpha);

subplot(2, 1, 1);
plot(t,Va,'r',t,Vb,'b');
title('Voltage Plot Above', 'FontSize', 20);
xlabel('Time', 'FontSize', 20);
ylabel('Va and Vb', 'FontSize', 20);
grid on;

% Now plot finger below.
subplot(2, 1, 2);
imshow('finger.jpg')
title('Finger Below', 'FontSize', 20);