sofaki000

Posted on

# Matlab plots tutorial

Introduction

In this tutorial we will look at some basic functionalities of matlab figures. We will see some examples and understand how to use functions such as plot and stem.

• figure creates a new figure window using default property values. The resulting figure is the current figure.

Example:

• figure(Name,Value) modifies properties of the figure using one or more name-value pair arguments. For example, figure('Color','Red') sets the background color to red (same as figure('Color','r')

### Creating one discrete and one 2D line plot in the same figure

figure("Color", "c"); %adds cyan color at the background of matlab % figure
%Creates a vector of 100 evenly spaced points in the interval
%[-5,5].
Y = linspace(-5,5,50);
plot(Y, "r:") % plots Y against an implicit set of x-coordinates.
% adds red color to line (from r) and makes it dotted (from :)
hold on % use hold on to add a second plot
stem(Y, "c") % plott discrete sequence data
% c makes line have cyan color


• grid= Display or hide axes grid lines

1) grid on = displays the major grid lines for the current axes

2) grid off = removes all grid lines from the current axes or chart.

3) grid minor = Display the minor grid lines.

• scatter = Scatter plot

• tiledlayout = Create tiled chart layout

Example:

tiledlayout(m,n) = creates a tiled chart layout for displaying multiple plots in the current figure. The layout has a fixed m-by-n tile arrangement that can display up to m*n plots.

Example no 2:

clc;
clear;
figure("Color", "c");
x = linspace(0,3*pi,200); %Create a vector of 100 points in the interval [0,3π,200].
y = cos(x) + rand(1,200);
t = tiledlayout(2,2);

title(t,'Title of our figure') % add title
t.TileSpacing = 'compact'; %Decrease the amount of space between the tiles by setting the TileSpacing property to 'compact'
t.Padding = 'compact'; %decrease the space between the edges of the layout and the edges of the figure by setting the Padding property to 'compact'.

ax1 = nexttile;
ax1.XColor = [1 1 1];
ax1.YColor = [1 0 0];
scatter(ax1,x,y);
grid on
title('Sample 1');

ax2 = nexttile;
scatter(ax2,x,y,'filled','d');
title('Sample 2');

nexttile(t);
bar([10 22 31 43 52])
title('Sample 3');

nexttile(t);

x = linspace(-10,10,200); %Create x as 200 linearly spaced values between -10 and 10.
y = cos(x); % Create y as the cosine of x.
plot(x,y)
%Change the tick value locations along the x-axis and y-axis.
%Specify the locations as a vector of increasing values. The values do not need to be evenly spaced.
xticks([-3*pi -2*pi -pi 0 pi 2*pi 3*pi])
xticklabels({'-3\pi','-2\pi','-\pi','0','\pi','2\pi','3\pi'}) %Also, change the labels associated with each tick value along the x-axis. To include special characters or Greek letters in the labels, use TeX markup, such as \pi for the π symbol
yticks([-1 -0.8 -0.2 0 0.2 0.8 1])