MATLAB Part-III

JavaScript isn't enabled in your browser, so this file can't be opened. Enable and reload.

MATLAB Part-III

You would like to randomly reorder every element in array a and put the result into another array b. Which code is NOT necessary to do that? *

1 point

b = a(randi(10, 1, 10));

Option 2

Option 3

b = a(randperm(10));

Which command will create a column vector with the values 7, 8, and 9? *

1 point

c = [7,8,9]

c = [7: 8: 9]

c = [7; 8; 9]

c = [7 8 9]

How is the random seed for MATLAB's random number generator first initialized in a MATLAB Session? *

1 point

Seed is undefined until it is initialized by the user.

Seed is set to a value based on the current time when user first calls rand()

Seed is set to a value based on the current time on startup.

Seed is set to a static default value on startup.

What is a difference between global variable and persistent variables? *

1 point

Global variables have a higher performance overhead than persistent variables.

Global variables remain in memory after clear all; persistent variables do not.

Global variables can be used to cache data in memory; persistent variables cannot.

Global variables are accessible outside the function scope; persistent variables are not.

What is the state of a at the end of this code? *

1 point

Option 1

Option 2

Option 3

Option 4

What kind of files are stored with the .mat extension? *

1 point

figure files

script files

function files

stored variable files

Where in the UI can you see what variables have been created, their values, and their class? *

1 point

Editor

command window

details

workspace

Which choice is the correct syntax for declaring a function that returns the input value as the output? *

1 point

Option 1

Option 2

Option 3

Option 4

Which statement reverses vector a? *

1 point

reverse(a)

a(end:- 1:1)

rev(a)

a(::-1)

Which statement returns 1 (true)? *

1 point

a == b

ischar(b)

length(a) == length(b)

class(a) == class(b)

If you run this piece of code, you will get an error. Why? *

1 point

You are attempting to multiply a non-square matrix by itself, causing a dimension mismatch.

MATLAB does not allow you to square all the elements in the matrix in a single operation.

You must use the ** operator instead of the ^ operator.

You cannot square matrices that have a 0 as the first element.

What is a reason to save a MAT-file using the -v7.3 flag? *

1 point

to ensure backward compatibility

to avoid HDF5 overhead in MAT-file

to include a variable greater that 2GB

to use compression by default

Which command will create a 10-element vector v with values from 1 to 10? *

1 point

v = {1:10}

v = [1-10]

v = 1:10

v = (10)

You wrote a new function named snap in an m-file and when you call it, you're not getting the output you expect. You previously wrote a different function named snap, which you think might also be on the search path. Which command can you use to see if the old snap function is being called? *

1 point

which

who

lookfor

what

Which does E contain? *

1 point

E = {'cat'} {'dog'}

E = {'mouse'}

E = {'cat'} {'cow'} {'dog'} {'piranha'}

E =

You've just plotted some data and want to change the color behind the lines you've plotted to black. Which code block will accomplish this? *

1 point

h_f = figure; set(h_f,'Color', [0 0 0]);

h_a = gca; set(h_a,'Color', [0 0 0]);

h_a = axes; set(h_a,'Color', [0 0 0]);

h_f = gcf; set(h_a,'Color', [0 0 0]);

Which statement will return all the odd numbers from 1 to 9? *

1 point

2*[1:5]+1

1:2:9

isodd(1:9)

1:odd:9

For a 5 x 5 array, the two subscript index (4,2) indexes the same location as linear index ___. *

1 point

What do you call in the command window to see all the variables in the workspace and their classes? *

1 point

who

vars

whos

who all

Which code block most likely produced this graph? *

1 point

Option 1

Option 2

In MATLAB, the imfilter command performs a convolution operation between an image and a matrix. Suppose you have an image loaded in MATLAB into the variable img and you apply the following code. The original image appears slightly blurred because the convolution smoothed out the image (removed noise). Why do you think this happened? *

1 point

h is a Gaussian filter that adds to 1. Its intended effect is to highlight image edges.

h is an averaging filter uniformly distributed that adds to 1. Its intended effect is to smooth out images (remove noise).

h is a Laplacian filter that adds up to 0. Its intended effect is to smooth out images (remove noise).

imfilter is a function that always blurs the images.

Given the following x and y coordinates, which choice calculates a linear regression for the x and y coordinates, and which plots the points of the x,y data and the regression line on the same graph? *

1 point

Option 1

Option 2

Option 3

Option 4

What is the size of b? *

1 point

1x3

3x2

2x3

2x9

Submit

Clear form

Forms

This content is neither created nor endorsed by Google.