Free MATLAB Interface Questions and Answers

Question 1

Which functions help you save and load variables?

Accepted Answer

">> save Lays a b
>> load('myfile.mat')"

Answer

To save specific variables (`a` and `b`) to a `.mat` file named `Lays`, the correct syntax is `save Lays a b`. To load variables from a `.mat` file, the `load` command is used, often with the filename in single quotes, e.g., `load('myfile.mat')`. The other options contain incorrect syntax for saving or loading.

Question 2

Where do we need to store a function to call it in other programs?

Accepted Answer

The bin folder

Answer

For a function to be callable from any program or location within MATLAB, it needs to be stored in a directory that is on MATLAB's search path. The `bin` folder (or any folder added to the MATLAB path) is a common location for user-defined functions to ensure they are accessible globally without needing to change the current directory.

Question 3

What are the differences between the commands "help" and "search for"?

Accepted Answer

Help returns the entire set while look for returns specific commands

Answer

The `help` command in MATLAB provides detailed documentation for a specific function, displaying its syntax, description, and examples. In contrast, `lookfor` performs a keyword search across the first line (H1 line) of all M-files on the MATLAB path, returning a list of functions related to the search term, thus providing specific commands rather than an entire set of documentation.

Question 4

What does the Workspace not display?

Accepted Answer

Time of variable generation

Answer

The MATLAB Workspace browser typically displays information such as variable names, their values, class (data type), size (dimensions), and bytes used. It does not, however, track or display the exact time when each variable was generated or last modified.

Question 5

How may the execution of a series of commands be stopped?

Accepted Answer

Press Ctrl +c

Answer

To interrupt and stop the execution of a running MATLAB script, function, or command, the standard keyboard shortcut is `Ctrl + c` (or `Cmd + c` on macOS). This sends an interrupt signal to MATLAB, halting the current operation.

MATLAB - MATLAB Technical Computing Practice Test

MATLAB - MATLAB Technical Computing Practice Test

Free MATLAB Interface Questions and Answers