MATLAB Basic Functions

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What does the 'std' function in MATLAB calculate?

Median
Mean
Variance
Standard deviation (correct)

How can you find the standard deviation of each row in a matrix using 'std' in MATLAB?

std(a,2) (correct)
std(a,1)
std(a,:)
std(:,a)

What does the 'zeros' function in MATLAB do?

Calculates the sum of all elements in an array
Creates an array with non-zero values
Generates random values ranging between 0 and 1
Creates an array with a selected size containing zeros (correct)

To create a square sized matrix with zeros using 'zeros' in MATLAB, what syntax should be used?

zeros(a,a) (B) Signup and view all the answers

'rand' function in MATLAB generates random values ranging between which range?

0 and 1 (C) Signup and view all the answers

How does the 'ones' function in MATLAB differ from the 'zeros' function?

'ones' creates arrays with only ones instead of zeros. (A) Signup and view all the answers

Which function is used in MATLAB to generate a square-sized matrix with random values between 0 and 1?

rand(a,a) (B) Signup and view all the answers

To generate a single random integer ranging between 10 to 20 in MATLAB, which function should be used?

randi([10,20]) (D) Signup and view all the answers

Which MATLAB function creates a vector with elements linearly spaced between specified values?

linspace(start, end, size) (D) Signup and view all the answers

What does the 'rand(1)' function in MATLAB do?

Generates a scalar with a random value between 0 and 1 (D) Signup and view all the answers

How is the 'randi([5,10],3,2)' MATLAB function interpreted?

Generating a 3x2 matrix with integers between 5 and 10 (D) Signup and view all the answers

In MATLAB, how is the 'linspace(1,10,5)' function used?

Creating a vector with elements linearly spaced from 1 to 10 (A) Signup and view all the answers

What does the 'sort' function do in MATLAB?

Sorts elements of a variable in ascending or descending order (C) Signup and view all the answers

How can you use the 'sort' function to sort values in each column of a matrix?

sort(a,1,'ascend') (A) Signup and view all the answers

What does the 'disp' function do in MATLAB?

Displays all the elements in an existing variable (B) Signup and view all the answers

How can you use the 'disp' function to display the elements of a variable named 'b'?

disp(b) (C) Signup and view all the answers

'roots' function in MATLAB is primarily used for finding:

Roots of a polynomial function (D) Signup and view all the answers

'save' function in MATLAB is primarily used for:

Storing variables defined in the current workspace (A) Signup and view all the answers

What is the correct way to find the cosine of a variable named (a) in MATLAB?

cos(a) (D) Signup and view all the answers

Which function in MATLAB finds the hyperbolic sine value of a scalar or all elements of an array?

sinh(a) (B) Signup and view all the answers

What range should the input value be in to use the 'acos' function in MATLAB?

-1 to 1 (C) Signup and view all the answers

Which function in MATLAB finds the tangent value of a scalar or all elements of an array?

tan(a) (D) Signup and view all the answers

What is the correct way to find the arc-tangent of a variable named (a) in MATLAB?

atan(a) (A) Signup and view all the answers

For the 'atan' function in MATLAB, what is the range of the output value for any real number input?

-π/2 to π/2 (B) Signup and view all the answers

What does the 'sum' function do when used after checking a logical condition in MATLAB?

Counts the number of elements that satisfy the set condition (C) Signup and view all the answers

In MATLAB, what does the command 'sum(sum(a>0))' calculate?

Total number of positive numbers in array a (B) Signup and view all the answers

How can you find the position of the number 6 in a variable named 'a' in MATLAB?

find(a==6) (A) Signup and view all the answers

What does the command 'sum(sum(a>1 & a>mean(a(find(a>0))))' calculate in MATLAB?

Number of elements in a larger than 1 and greater than the mean of positive elements (A) Signup and view all the answers

How can you calculate the percentage of positive numbers in a variable named 'a' in MATLAB?

(sum(sum(a>0))/numel(a))*100 (C) Signup and view all the answers

What is the purpose of the command 'linspace(1,10,10)' in MATLAB?

Generate a vector from 1 to 10 with 10 evenly spaced elements (C) Signup and view all the answers

MATLAB Basic Functions - Std Quiz

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