MATLAB Basics
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Questions and Answers

What does the command 'clear' do in MATLAB?

  • Sets the format of numerical values to have 4 values to follow the decimal
  • Deletes all current variables (correct)
  • Separates several MATLAB commands on one line
  • Displays the list of variables in use during the current session

    • What is the purpose of the '%' symbol in MATLAB?

  • To request a list of variables plus their size and type
  • To denote a non-executable line or portion of a line (correct)
  • To separate commands on one line
  • To suppress the display of the MATLAB line

    • What is the difference between 'who' and 'whos' commands in MATLAB?

  • 'who' is used to display variables, while 'whos' is used to delete variables
  • 'who' requests a list of variables plus their size and type, while 'whos' requests a list of variables
  • 'who' requests a list of variables, while 'whos' requests a list of variables plus their size and type (correct)
  • 'who' is used to delete variables, while 'whos' is used to display variables

    • What is the purpose of the comma in MATLAB?

    <p>To separate several MATLAB commands on one line</p> Signup and view all the answers

    How does MATLAB automatically set the format of numerical values in the command window?

    <p>To have 4 values to follow the decimal</p> Signup and view all the answers

    What is the purpose of the ellipsis in MATLAB?

    <p>To continue a MATLAB command onto the following line</p> Signup and view all the answers

    What is the default variable name in MATLAB if no location is specified?

    <p>ans</p> Signup and view all the answers

    What is the purpose of the 'd' in MATLAB functions such as tand(x) and cosd(x)?

    <p>To specify the degree measure</p> Signup and view all the answers

    What is the limitation on the length of a variable name in MATLAB for the purposes of this class?

    <p>33 characters</p> Signup and view all the answers

    What is the recommended format type to use when dealing with complex numbers in MATLAB?

    <p>short</p> Signup and view all the answers

    What is the purpose of the 'format long' command in MATLAB?

    <p>To display the number with a total of 16 numerical digits</p> Signup and view all the answers

    What is the result of the MATLAB command '0.25+0.5' if no variable name is specified?

    <p>ans = 0.7500</p> Signup and view all the answers

    What is the difference between the MATLAB commands 'tan(x)' and 'tand(x)'?

    <p>tan(x) is for radian measures, tand(x) is for degree measures</p> Signup and view all the answers

    What is the significance of the variable 'i' in MATLAB?

    <p>It is a reserved variable for complex numbers</p> Signup and view all the answers

    What is the output of the command A = [1 2 3; 4 5 6; 7 8 9]; A^2?

    <p>[30 36 42; 66 81 96; 102 126 150]</p> Signup and view all the answers

    How can you get the transpose of a matrix A?

    <p>Using the ' operator</p> Signup and view all the answers

    What is the command to compute the inverse of a matrix A?

    <p>inv(A)</p> Signup and view all the answers

    What is the command to compute the determinant of a matrix A?

    <p>det(A)</p> Signup and view all the answers

    What is the output of the command A = [1 2 3; 4 5 6; 7 8 9]; A(:,3)?

    <p>[3; 6; 9]</p> Signup and view all the answers

    What is the difference between A^2 and A.^2?

    <p>A^2 is matrix multiplication, A.^2 is element-wise multiplication</p> Signup and view all the answers

    How can you solve the equation [A]{x} = {b}?

    <p>x = inv(A)*b</p> Signup and view all the answers

    What is the command to create an identity matrix of size 3?

    <p>I = [1 0 0; 0 1 0; 0 0 1]</p> Signup and view all the answers

    What is the purpose of the if structure in MATLAB?

    <p>To make decisions based on conditions</p> Signup and view all the answers

    What is the purpose of the roots function in MATLAB?

    <p>To find all the roots of a polynomial equation</p> Signup and view all the answers

    What is the syntax to find the LU factorization of a matrix X in MATLAB?

    <p>[L,U] = lu(X)</p> Signup and view all the answers

    What is the purpose of the chol function in MATLAB?

    <p>To find the Cholesky factorization of a matrix</p> Signup and view all the answers

    What is the purpose of the fzero function in MATLAB?

    <p>To find the zero of a function</p> Signup and view all the answers

    What is the purpose of the polyval function in MATLAB?

    <p>To evaluate a polynomial at a specific point</p> Signup and view all the answers

    What is the primary difference between a script file and a function file in MATLAB?

    <p>Script files run in the base workspace, whereas function files run in their own workspace.</p> Signup and view all the answers

    What is the purpose of the input function in MATLAB?

    <p>To prompt the user for a value.</p> Signup and view all the answers

    What is the purpose of the disp function in MATLAB?

    <p>To display a value to the user.</p> Signup and view all the answers

    What is the purpose of the fprintf function in MATLAB?

    <p>To display a set of values to the user.</p> Signup and view all the answers

    What is the output of the stats function when given the input [8 5 10 12 6 7.5 4]?

    <p>mean = 7.5, stdev = 2.1</p> Signup and view all the answers

    What is the purpose of a function handle in MATLAB?

    <p>To assign a function to a variable.</p> Signup and view all the answers

    What is the formula for calculating the volume of a cylinder?

    <p>V = pi<em>r^2</em>h</p> Signup and view all the answers

    What is the formula for calculating the total surface area of a cylinder?

    <p>S = 2<em>pi</em>r<em>h + 2</em>pi*r^2</p> Signup and view all the answers

    Study Notes

    MATLAB Basics

    • The clear command is used to delete all current variables; to delete specific variables, use clear var1 var2.
    • who and whos are used to request a list of variables in use during the current session, with whos also displaying size and type.

    Symbols and Usage

    • % is used to denote a non-executable line or portion of a line, and can be used for commenting.
    • ; is used to suppress the display of a MATLAB line and can also be used to separate commands on one line.
    • , is used to separate several MATLAB commands on one line.
    • … is used to continue a MATLAB command onto the following line.

    Numerical Values and Formats

    • The format of numerical values in the command window is automatically set to have 4 values to follow the decimal, even if trailing zeros must be written.
    • format long is used to display 16 numerical digits.
    • format bank is used to display numbers in banking format.

    Variables

    • A variable name is a location used to store either the results of mathematical operations or to store data.
    • A variable name can contain letters, numbers, and/or underscores, but must be less than 33 characters and start with a letter.
    • Variable names are case sensitive and should be relevant to the value it represents.
    • If no location is specified, ans is the default variable name.

    Special Variables

    • Certain variables (e.g. i, j, eps) should not be used as variable names.

    Mathematical Operations

    • MATLAB supports various mathematical operations, including trigonometric functions (e.g. tan, sin, cos) and complex values.
    • When dealing with complex numbers, the format type should be left as short.

    Matrix Manipulations

    • Matrices can be indexed using A(:,3) to select columns and A(3,:) to select rows.
    • Matrices can be manipulated using various operations, including exponentiation (A^2), element-wise exponentiation (A.^2), and matrix multiplication.
    • The transpose of a matrix can be obtained using the ' operator.
    • Matrices can be augmented using Aug=[A I] and D=[A;I].
    • The matrix inverse can be computed using the inv function.
    • The matrix determinant can be computed using the det function.

    Arrays, Vectors, and Matrices

    • The colon operator is used to create and manipulate arrays.
    • Functions can be built and scripts can be created in the MATLAB editor.

    Programming in MATLAB

    • A function is a self-contained set of instructions designed to do a specific task.
    • A function has its own workspace for variables, and information can be added to or removed from the workspace only through input and output variables.
    • Function handles can be assigned to variables.
    • Script files can be created using File, New, M-file.
    • clc, clear all, and close all are used to clear the command window and reset variables.

    Input-Output

    • The input function is used to prompt the user for values directly from the command window.
    • The disp function is used to display a value.
    • The fprintf function is used to display a set of values.

    Decisions

    • The if structure is used for conditional statements.

    MATLAB Functions

    • The roots function is used to determine all the roots, both real and complex, of a polynomial equation.
    • The lu function is used to generate the LU factorization of a matrix.
    • The chol function is used to generate the Cholesky factorization of a matrix.

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    Description

    Learn basic commands in MATLAB such as clearing variables and listing variables with their size and type.

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