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Environment and Syntax Flashcards

6 cards from real MATLAB practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Environment and Syntax flashcards as text

  1. Which of the following is an invalid variable name in MATLAB?

    Answer: 2start_variable

    In MATLAB, a valid variable name must start with a letter, followed by any combination of letters, digits, or underscores. The name '2start_variable' is invalid because it begins with a digit.

  2. A user wants to remove all variables from the Workspace and clear the text from the Command Window. Which combination of commands achieves this?

    Answer: clear; clc

    The 'clear' command removes all variables from the current workspace. The 'clc' command clears all text from the Command Window, providing a 'clean screen'. The combination 'clear; clc' performs both of the desired actions.

  3. In the MATLAB Desktop Environment, which window is primarily used for writing, editing, and saving multi-line scripts and functions that can be executed as a whole?

    Answer: Editor

    The Editor is the component of the MATLAB environment designed for writing, editing, saving, and debugging scripts and function files (.m files). The Command Window is for executing single-line commands interactively.

  4. A user executes the following code in a new MATLAB session: x = 1:5; y = x(end) + x(1); What is the value of 'y' in the Workspace?

    Answer: 6

    The expression 'x = 1:5' creates a vector [1, 2, 3, 4, 5]. In MATLAB, array indexing starts at 1. The 'end' keyword, when used for indexing, refers to the last element of an array. Therefore, x(end) is 5 and x(1) is 1. The variable 'y' is assigned the sum of these two values, which is 5 + 1 = 6.

  5. How do you start a multi-line block comment in a MATLAB script?

    Answer: %{

    To create a block comment that spans multiple lines, you begin the block with '%{' and end it with '%}'. The '%%' syntax is used to create runnable code sections, and a single '%' comments out the rest of a single line.

  6. A user defines a 3x3 matrix `A = magic(3);`. Which command will correctly extract the entire second row of this matrix?

    Answer: A(2, :)

    In MATLAB matrix indexing, the format is `matrix(row, column)`. To select all elements in a dimension, you use the colon operator ':'. Therefore, `A(2, :)` selects the elements from the second row and all columns.