MATLAB Environment and Syntax 5

Question 1

What is the effect of using `global x` inside a MATLAB function?

Accepted Answer

Shares `x` across the base workspace and all functions that declare it global

Answer

Declaring a variable `global` allows multiple functions and the base workspace to share the same instance of that variable.

Question 2

Which MATLAB command saves all current workspace variables to a `.mat` file named `data.mat`?

Accepted Answer

save('data.mat')

Answer

`save('data.mat')` writes all workspace variables to a binary `.mat` file, which can later be restored with `load`.

Question 3

What does `nargin` return inside a MATLAB function?

Accepted Answer

The actual number of input arguments passed by the caller

Answer

`nargin` returns the count of input arguments that were actually provided when the function was called, enabling optional-argument patterns.

Question 4

In MATLAB, what does the `end` keyword represent when used as an array index?

Accepted Answer

The last valid index of that dimension

Answer

When used inside indexing parentheses, `end` automatically resolves to the last index of the relevant array dimension.

Question 5

Which of the following correctly creates a row vector of integers from 1 to 10 with a step of 2?

Accepted Answer

1:2:10

Answer

The colon operator `start:step:end` generates a vector; `1:2:10` produces [1 3 5 7 9].

MATLAB - MATLAB Technical Computing Practice Test