Podcast
Questions and Answers
What is the correct way to start a diary in MATLAB?
What is the correct way to start a diary in MATLAB?
- diary on (correct)
- start diary
- diary start
- diary init
What must be included at the beginning of a MATLAB script file for an assignment?
What must be included at the beginning of a MATLAB script file for an assignment?
- The date and time
- The author's name and section number (correct)
- The MATLAB version being used
- A list of required packages
Which indices will generate an error when used with the array 'lengths = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]'?
Which indices will generate an error when used with the array 'lengths = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]'?
- lengths(0)
- lengths(11) (correct)
- lengths(8)
- lengths(5)
How can you access the element in the second row and fourth column of a 2-D array in MATLAB?
How can you access the element in the second row and fourth column of a 2-D array in MATLAB?
Which command would correctly expand the array 'amps = [3, 11.3, 6.7, 9.1, 45]' to include an index of 10?
Which command would correctly expand the array 'amps = [3, 11.3, 6.7, 9.1, 45]' to include an index of 10?
Which of the following correctly retrieves multiple elements from the array 'amps' using indices 1, 3, and 5?
Which of the following correctly retrieves multiple elements from the array 'amps' using indices 1, 3, and 5?
What will happen if you enter an out-of-range index when accessing an element in MATLAB?
What will happen if you enter an out-of-range index when accessing an element in MATLAB?
To retrieve elements from rows 1 to 3 and columns 2 to 4 of a 2-D array in MATLAB, which command is correct?
To retrieve elements from rows 1 to 3 and columns 2 to 4 of a 2-D array in MATLAB, which command is correct?
Flashcards
Diary Command
Diary Command
A file that stores a list of commands executed in MATLAB, including both successful and unsuccessful commands.
MATLAB Script File
MATLAB Script File
A script file in MATLAB contains a series of commands designed to perform a specific task. It is reusable and can be run multiple times to automate processes.
2-D Array
2-D Array
A two-dimensional array in MATLAB is represented as a table with rows and columns, where each element is associated with a specific row and column index.
Accessing Elements in an Array
Accessing Elements in an Array
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Indices Out of Range
Indices Out of Range
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Accessing Elements in 2-D Array
Accessing Elements in 2-D Array
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Accessing Multiple Elements in an Array
Accessing Multiple Elements in an Array
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Accessing Specific Elements in an Array
Accessing Specific Elements in an Array
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Study Notes
Diary Command
- Allows creation of a list of commands (good and bad) recorded in a file
- Start a diary session by typing "diary" followed by the file name(optional)
- End the diary session by typing "diary off"
MATLAB Script File
- Lists commands to complete a task
- Can be run repeatedly
- Required for assignments
- Include student name and section number at the start
- Use
clc(clear the command window) andclear(clear variables) before starting - Include detailed introductory comments before each problem for assignments
- Clearly specify description, input, output, and processing steps
- Include commands needed to solve the problem
2-D Arrays
- Create 2-D arrays by separating rows, typically with semicolons
- Combine existing row vectors to create arrays
Accessing Elements in an Array
- MATLAB uses parentheses to enclose array indices (subscripts)
- Access a specific element using
arrayname(index)(for 1-D) - Access multiple elements using a colon operator to define ranges (e.g.,
lengths(2:7)) or hard-coded lists (lengths([2 5 1 8])) - Note these lists can be in any order
Indices Out of Range
- Trying to access an element outside the array boundaries will result in an error
- You can extend the size of an array using assignment
- Example:
amps(10) = 99can extend a 1D vector (like [3, 11.3, 6.7, 9.1, 45]) to [3, 11.3, 6.7, 9.1, 45, 0, 0, 0, 0, 99]
Accessing Elements in 2-D Arrays
- Access elements by referencing row and column indices
- The syntax for a single element is
arrayname(row,column) - To access multiple elements, use a combination of indices; e.g.
arrayname(1:4,6),arrayname(4, [5 1 6]), orarrayname(4:2, 1:5)
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