MATLAB: Plot different tables date/time against other valuables

plotting

Hello everybody,

I had a question about plotting some numbers. I just started with matlab so I have not much of experience.

I like to get the values of "H_ventilation.t_supply_air_after_ventilation_unit" set against te date and time which is measured every 3 minutes. I hope somebody can help me to create a script for this problem. Thank you all in advance.

Best Answer

It's a little hard to test without your data, but give this a shot. It's just off the top of my head so you might have to adjust it a little:

y = [H_ventilation.t_supply_air_after_ventilation_unit]
t = [H_ventilation.time{:}]
plot(t, y, 'bo-', 'LineWidth', 2);
grid on;
xlabel('Time', 'FontSize', 22);
tlabel('Supply Air', 'FontSize', 22);

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MATLAB: I need to plot the amplitude of the signals

Try not using so many elements - too many to display.

Try this:

clc;
close all;
clear;
workspace;
format long g;
format compact;
fontSize = 15;
%variables
Am=5; %message signal amplitude

Ac=10; %message signal amplitude
t= linspace(0, 0.04, 1500); %period
Fm=50; %message frequency
Fc=1000; %carrier frequency
%output graph preparation
m=Am*cos(2*pi*Fm*t); % Signal equation
c=Ac*cos(2*pi*Fc*t); % Carrier equation
%plot m(t) and its amplitude
subplot(2,3,1);
plot(t,m);
xlabel('time', 'FontSize', fontSize);
ylabel('m(t)', 'FontSize', fontSize);
title('Signal Equation', 'FontSize', fontSize);
% Put x axis in the right place.



ax = gca
ax.XAxisLocation = 'origin'
subplot(2,3,2);
plot(t,abs(m));
xlabel('time', 'FontSize', fontSize);
ylabel('m(t)', 'FontSize', fontSize);
title('Signal Amplitude', 'FontSize', fontSize);
%plot c(t) and its amplitude
subplot(2,3,3);
plot(t,c);
xlabel('time', 'FontSize', fontSize);
ylabel('c(t)', 'FontSize', fontSize);
title('Carrier Equation', 'FontSize', fontSize);
% Put x axis in the right place.
ax = gca
ax.XAxisLocation = 'origin'
subplot(2,3,4);
plot(t,abs(c));
xlabel('time', 'FontSize', fontSize);
ylabel('c(t)', 'FontSize', fontSize);
title('Carrier Amplitude', 'FontSize', fontSize);
% Put x axis in the right place.
ax = gca
ax.XAxisLocation = 'origin'
%Sketch the magnitude of the multiplication of m(t) with c(t).
y=m.*c;
subplot(2,3,5);
plot(t,y);
xlabel('time', 'FontSize', fontSize);
ylabel('m(t) .* c(t)', 'FontSize', fontSize);
title('Multiplication of m(t) with c(t)', 'FontSize', fontSize);
% Put x axis in the right place.
ax = gca
ax.XAxisLocation = 'origin'
subplot(2,3,6);
plot(t,abs(y));
xlabel('time', 'FontSize', fontSize);
ylabel('y(t)', 'FontSize', fontSize);
title('Amplitude of the multiplication', 'FontSize', fontSize);
% Set up figure properties:
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Get rid of tool bar and pulldown menus that are along top of figure.
set(gcf, 'Toolbar', 'none', 'Menu', 'none');
% Give a name to the title bar.
set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off')

MATLAB: How to get frequency of a wav file for per cycle in matlab

If you have the Signal Processing Toolbox, try spectrogram() or pwelch().

Otherwise, try fft().

Best Answer

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MATLAB: I need to plot the amplitude of the signals

MATLAB: How to get frequency of a wav file for per cycle in matlab

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