MATLAB Variables and Workspace Interaction 3

Question 1

Which of the following variable names is INVALID in MATLAB?

Accepted Answer

1stValue

Answer

MATLAB variable names must begin with a letter; `1stValue` starts with a digit and is therefore invalid.

Question 2

What happens to a workspace variable if you declare a function with the same name in a script?

Accepted Answer

The function takes precedence over the variable during function calls

Answer

In MATLAB's precedence order, functions defined in the current scope shadow workspace variables when called as functions.

Question 3

What is the maximum length of a MATLAB variable name?

Accepted Answer

63 characters

Answer

MATLAB variable names can be at most 63 characters long; characters beyond that are ignored.

Question 4

What does `save('backup.mat', '-append')` do when 'backup.mat' already exists?

Accepted Answer

Adds new variables without removing existing ones

Answer

The `-append` flag adds or updates variables in an existing .mat file without deleting variables that are already present.

Question 5

What is stored in the MATLAB variable `ans` after executing `3 + 4` without assigning the result?

Accepted Answer

7

Answer

`ans` is a special MATLAB variable that automatically stores the result of the most recent expression not assigned to a named variable.

MATLAB - MATLAB Technical Computing Practice Test