MATLAB Basics and 2-D Arrays

What is the correct way to start a diary in MATLAB?

What must be included at the beginning of a MATLAB script file for an assignment?

Which indices will generate an error when used with the array 'lengths = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]'?

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 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?

To retrieve elements from rows 1 to 3 and columns 2 to 4 of a 2-D array in MATLAB, which command is correct?

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) and clear (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) = 99 can 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]), or arrayname(4:2, 1:5)

This quiz covers foundational concepts in MATLAB, including creating scripts, managing diary sessions, and working with 2-D arrays. Explore how to access elements within arrays and the best practices for documenting your MATLAB code. Test your understanding of essential commands and procedures for MATLAB programming.