Matplotlib Plot Customization

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Questions and Answers

What is the purpose of the command xlabel(‘text’)?

To add a legend to a graph
To set the title of a graph
To label the x-axis (correct)
To turn off the axes box

What does the command gtext(‘text’) do?

Adds a grid to the current graph
Places a text at specific coordinates
Places a text on a graph using the mouse (correct)
Turns off the axes box

What is the effect of the command axis manual?

It returns the axis scaling to its automatic defaults
It sets the axis limits to the range of data
It freezes the scaling at the current limits (correct)
It sets the scaling factor for both axes to be equal

What does the command legend(‘text1’,’text2’) do?

Adds a legend to the graph (A) Signup and view all the answers

What is the purpose of the command box off?

To turn off the axes box (B) Signup and view all the answers

What does the command axis square do?

It sets the current plot to be a square (A) Signup and view all the answers

What is the effect of the command grid off?

It removes the grid lines (A) Signup and view all the answers

What does the command axis auto do?

It returns the axis scaling to its automatic defaults (A) Signup and view all the answers

What is the purpose of the script files in Matlab?

To perform tasks that never change (B) Signup and view all the answers

What is the function of the 'xlabel' command in Matlab?

To label the x-axis (B) Signup and view all the answers

What is the purpose of the 'axis equal' command in Matlab?

To set the aspect ratio of the plot to equal (D) Signup and view all the answers

What is the function of the 'plot3' command in Matlab?

To plot a 3D graph (A) Signup and view all the answers

What is the purpose of the 'linspace' function in Matlab?

To generate a vector of equally spaced values (B) Signup and view all the answers

What is the purpose of the 'grid on' command in Matlab?

To turn on the grid (A) Signup and view all the answers

What is the purpose of the 'ylabel' command in Matlab?

To label the y-axis (B) Signup and view all the answers

What is the purpose of the 'zlabel' command in Matlab?

To label the z-axis (D) Signup and view all the answers

What is the purpose of the figure function in the provided examples?

To create a new figure window (D) Signup and view all the answers

What is the purpose of the subplot function in the provided examples?

To divide the figure into multiple subplots (B) Signup and view all the answers

In the example `subplot(2, 1, 1)`, what does the number 2 represent?

The number of rows in the subplot (C) Signup and view all the answers

What is the difference between `subplot(1, 2, 1)` and `subplot(2, 1, 1)`?

The first one creates a subplot with 1 row and 2 columns, while the second one creates a subplot with 2 rows and 1 column (A) Signup and view all the answers

What is the purpose of the plotting expressions in the provided examples?

To plot the data in the specified subplot (D) Signup and view all the answers

What is the result of running the example code `x=linspace(0, 20); y=sin(x); z=10*cos(x); subplot(2,1,1), plot(x,y); subplot(2,1,2), plot(x,z)`?

A single figure window with two subplots, one with a sine plot and one with a cosine plot (A) Signup and view all the answers

What is the purpose of the `axis` function in the given Matlab code?

To set the x and y limits of the plot (D) Signup and view all the answers

What is the difference between the `plot` and `plot3` functions in Matlab?

The <code>plot</code> function is used for 2D plots, while <code>plot3</code> is used for 3D plots (A) Signup and view all the answers

What is the purpose of the `subplot` function in the given Matlab code?

To create multiple plots in the same figure (D) Signup and view all the answers

How can you copy a figure created in Matlab to the Windows clipboard?

By selecting Copy Figure from the Edit pull-down menu (D) Signup and view all the answers

What is the purpose of the `title` function in the given Matlab code?

To specify the title of the plot (C) Signup and view all the answers

What is the format of the `plot3` function in Matlab?

plot3(u1, v1, w1, c1, u2, v2, w2, c2, ...) (A) Signup and view all the answers

What is the purpose of the `linspace` function in the given Matlab code?

To create a vector of linearly spaced values (B) Signup and view all the answers

What is the purpose of the `copy` function in the given Matlab code?

To copy a figure to the Windows clipboard (D) Signup and view all the answers

What does $x_1$ represent in the given mechanical system?

Displacement (A) Signup and view all the answers

Which variable represents the damping coefficient in the equations?

c (D) Signup and view all the answers

In the MATLAB function 'msd', what does the variable 'A' represent?

The state matrix (A) Signup and view all the answers

What is the initial condition input to the ode45 solver in terms of displacement and velocity?

[0, 0] (B) Signup and view all the answers

In the system matrix equation, what does $b$ represent?

Forcing function matrix (D) Signup and view all the answers

What is the output of the MATLAB 'plot' function in test.m?

A plot of time versus displacement and velocity (A) Signup and view all the answers

What is the value of the mass variable 'm' in the given MATLAB script?

1 (B) Signup and view all the answers

Which of these represents the forcing function in the mechanical system model?

f (C) Signup and view all the answers

Study Notes

Mechanical Systems and Matlab

Mechanical systems can be represented by a system of first-order ordinary differential equations: dx1/dt = x2 and dx2/dt = (f(t) - k*x1 - c*x2) / m
These equations can be written in matrix form as x& = Ax + b*f(t), where A is a coefficient matrix and b is a constant vector
In Matlab, the system can be solved using the ode45 function, which solves ordinary differential equations with initial conditions

Matlab Scripting

A script is a file that contains a sequence of Matlab commands
Scripts are useful for tasks that never change, and can be used to document homework by writing a function that solves a problem for arbitrary parameters
Script variables are part of the workspace, and can be used to input parameters and run functions

Plotting in Matlab

subplot is used to create multiple plots on a single figure
plot3 is used to create 3D plots, with the syntax plot3(x, y, z)
xlabel, ylabel, and zlabel are used to add labels to plots
title is used to add a title to a plot
grid on and grid off are used to add or remove grid lines from a plot
axis is used to set the scaling for a plot, with options including axis auto, axis manual, axis equal, and axis tight
legend is used to add a legend to a plot

3D Plotting in Matlab

plot3 is used to create 3D plots, with the syntax plot3(x, y, z)
The plot3 function can also be used with multiple sets of data, using the syntax plot3(u1, v1, w1, c1, u2, v2, w2, c2, …)
u, v, and w are the x, y, and z coordinates, respectively, and c is a string of characters specifying the color and point characteristics

Other Matlab Functions

text is used to add text to a plot at a specific location
gtext is used to add text to a plot using the mouse
figure is used to create a new figure window
axis square is used to set the aspect ratio of a plot to be equal in both directions

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Description

Customize your plots with Matplotlib! Learn how to add titles, labels, and legends to your plots using various commands and functions.