Matlab

From what distribution does the `rand()` function return value?

1.

normal

2.

poisson

3.

binomial

4.

uniform

Q 1 / 64

Matlab

Based on the code below, c is the _ of a.

a = rand(1, 11); b = sort(a); c = b(1, ceil(end/2));

1.

median

2.

mode

3.

mean

4.

margin

Q 2 / 64

Matlab

What does the Profiler track?

1.

execution time

2.

command history

3.

errors

4.

the value of variables

Q 3 / 64

Matlab

Which code block contains the correct syntax for a `while` loop?

a = 0; do     a = a + 1; while a < 5 end   a = 0; while(a < 5)     a = a + 1;   a = 0; while a < 5:     a = a + 1;   a = 0; while a < 5     a = a + 1; end

1.


a = 0;
do
    a = a + 1;
while a < 5
end

2.


a = 0;
while(a < 5)
    a = a + 1;

3.


a = 0;
while a < 5:
    a = a + 1;

4.


a = 0;
while a < 5
    a = a + 1;
end

Q 4 / 64

Matlab

What does `b` contain?

a =     19    20    12     0     6      6     9    56     0     3     46     8     9     8    19      9     8     8    19    46      1     9    46     6    19   b =     56     0      9     8   b =      8    19     19    46

1.

2.

Q 5 / 64

Matlab

You have written a function `myfun` and want to measure how long it takes to run. Which code segment will return in `t` the time in seconds it takes `myfun` to run?

t = cputime(myfun()); tic; myfun(); toc; timer.start; myfun() t = timer.stop; t = timer(myfun());

1.


t = cputime(myfun());

2.


tic;
myfun();
toc;

3.


timer.start;
myfun()
t = timer.stop;

4.


t = timer(myfun());

Q 6 / 64

Matlab

What is `%%` used for?

1.

argument placeholder

2.

block quotes

3.

code sections

4.

conversion specifier

Q 7 / 64

Matlab

what is the `.` character NOT used for?

1.

structure field access

2.

a decimal point

3.

cell array access

4.

element-wise operations

Q 8 / 64

Matlab

Which function could you use for multiple linear regression?

1.

polyval

2.

regress

3.

solve

4.

polyfit

Q 9 / 64

Matlab

For which of these arrays do `mean`, `median`, and `mode` return the same value?

1.

[0 1 1 1 2]

2.

[1 3 5 5 6]

3.

[0 1 1 1 1]

4.

[0 0 5 5 5]

Q 10 / 64

Matlab

You are in the middle of a long MATLAB session where you have performed many analyses and made many plots. You run the following commands, yet a figure window doesn't pop up on the top of your screen with your plot. What might be the issue?

x = [-1:0.1:1]; y = X.^2; plot(x, y)

1.

Your plot doesn't plot in a figure window because `figure` was not called immediately in advance.

2.

Your `plot` syntax is incorrect.

3.

Your plot is in a figure window that was already open, hidden behind other windows on your screen.

4.

Your plot was saved to an image file but not displayed.

Q 11 / 64

Matlab

How do you access the value for the field `name` in structure S?

1.

S['name']

2.

S.name

3.

S('name')

4.

S{'name'}

Q 12 / 64

Matlab

What built-in definition does i have?

1.

basic imaginary unit

2.

index function

3.

infinity

4.

index variable

Q 13 / 64

Matlab

Which statement is equivalent to this for loop?

a = [1 2 3; 4 5 6]; b = zeros(size(a)); for i_row = 1:size(a, 1)     for i_col = 1:size(a, 2)         b(i_row, i_col) = a(i_row, i_col)^2;     end end

1.

b = a*a;

2.

b = a.^2;

3.

b = a^2;

4.

b = pow2(a);

Q 14 / 64

Matlab

You have plotted values of cosine from -10 to 10 and want to change the x-axis tick marks to every pi, from -3pi to 3pi. Which statement will do that?

1.

xticks(-3*pi:3.14:3*pi)

2.

xticks(-3*pi:pi:3*pi)

3.

xticks(linespace(-3*pi(), 3*pi(), pi()))

4.

xticks(linespace(-3*pi, 3*pi, pi)

Q 15 / 64

Matlab

What is the value of `c`?

a = ones(1,3); b = 1:3; c = conv(a,b)

1.

[-1 2 -1]

2.

[1 3 6 5 3]

3.

6

4.

[1 -2 1]

Q 16 / 64

Matlab

Which function CANNOT be used to randomly sample data?

1.

datasample

2.

randi

3.

resample

4.

randperm

Q 17 / 64

Matlab

Which choice is correct syntax for a `switch` statement?

x = 7; switch x     case 2         disp("two");     otherwise         disp("not two"); end   x = 7; switch x :     case 2         disp("two");     otherwise         disp("not two"); end   x = 7; switch x     case 2         disp("two");     else         disp("not two"); end   x = 7; switch x     case 2         disp("two");     default         disp("not two"); end

1.


x = 7;
switch x
    case 2
        disp("two");
    otherwise
        disp("not two");
end

2.


x = 7;
switch x :
    case 2
        disp("two");
    otherwise
        disp("not two");
end

3.


x = 7;
switch x
    case 2
        disp("two");
    else
        disp("not two");
end

4.


x = 7;
switch x
    case 2
        disp("two");
    default
        disp("not two");
end

Q 18 / 64

Matlab

What is the result of this code?

a = 1; b = 2; c = 3; d = 4; e = c / (~a - b == c - d); c = NaN c = Inf c = -0.2500

1.


c =
    NaN

2.


c =
    Inf

3.


c =
    -0.2500

Q 19 / 64

Matlab

What is true of a handle class object?

1.

When you pass a handle object to a function, a new object is made that is independent of the original.

2.

All copies of handle objects refer to the same underlying object.

3.

Handle object cannot reference one another.

4.

Handle object do not have a default `eq` function.

Q 20 / 64

Matlab

Which choice has a different final result in `f10` than the other three?

f10 = 1; for i = 1:10     f10 = f10 * i; end    `f10 = factorial(10)` MATLAB f10 = 1; i = 1; while i <= 10     i   = i + 1;     f10 = i * f10; end    `f10 = prod(1:10)`

1.


f10 = 1;
for i = 1:10
    f10 = f10 * i;
end

2.

undefined

3.

MATLAB
f10 = 1;
i = 1;
while i <= 10
    i   = i + 1;
    f10 = i * f10;
end

4.

undefined

Q 21 / 64

Matlab

Which choice will NOT give you a 5 x 5 identity matrix?

a = rand(5); round(a * inv(a)) `diag(ones(5, 1))` `identity(5)` `eye(5)`

1.


a = rand(5);
round(a * inv(a))

2.

undefined

3.

undefined

4.

undefined

Q 22 / 64

Matlab

Which statement creates this structure?

dog =       name: 'Bindy'      breed: 'border collie'     weight: 32    `dog = struct('name', 'Bindy'; 'breed', 'border collie'; 'weight', 32);`  dog.name   = 'Bindy'; dog.breed  = 'border collie'; dog.weight = 32;   dog = {     'name'  : 'Bindy',     'breed' : 'border collie',     'weight': 32; }   dog('name')   = 'Bindy'; dog('breed')  = 'border collie'; dog('weight') = 32;

1.

undefined

2.


dog.name   = 'Bindy';
dog.breed  = 'border collie';
dog.weight = 32;

3.


dog = {
    'name'  : 'Bindy',
    'breed' : 'border collie',
    'weight': 32;
}

4.


dog('name')   = 'Bindy';
dog('breed')  = 'border collie';
dog('weight') = 32;

Q 23 / 64

Matlab

`my_func` is a function as follows. What is the value of `a` at the end of the code beneath?

function a = my_func(a) a = a + 1; end a = 0; for i = 1:3 my_func(a); end a = my_func(a);

1.

undefined

2.

4

3.

3

4.

0

5.

1

Q 24 / 64

Matlab

Which statement could create this cell array?

c = {["hello world"]} {1×1 cell} {["goodbye"]} {1×3 double}

1.

c = {"hello world" {"hello"} "goodbye" [1 2 ]};

2.

c = {"hello world" {"hello"} "goodbye" {[1 2 3]}};

3.

c = {"hello world" {"hello"} "goodbye" [1 2 3]};

4.

c = {"hello world" {"hello" "hello"} "goodbye" {[1 2 3]}};

Q 25 / 64

Matlab

Which choice adds `b` to each row of `a`?

a = ones(4, 4); b= [1 2 3 4];

1.

a = a + reshape(b, 4, 1);

2.

a = a + b';

3.

a = a + repmat(b, 4, 1);

4.

a = a + [b b b b];

Q 26 / 64

Matlab

Which choice replaces all `a`s with `o`s?

for i = 1:length(fruit)     fruit{i}(fruit{i} == a) == o; end   for i = 1:length(fruit)     fruit(i)(fruit(i) == 'a') == 'o'; end   for i = 1:length(fruit)     fruit{i}(fruit{i} == 'a') == 'o'; end   for i = 1:length(fruit)     fruit{i}(fruit{i} == 'a') == 'o';

1.


for i = 1:length(fruit)
    fruit{i}(fruit{i} == a) == o;
end

2.


for i = 1:length(fruit)
    fruit(i)(fruit(i) == 'a') == 'o';
end

3.


for i = 1:length(fruit)
    fruit{i}(fruit{i} == 'a') == 'o';
end

4.


for i = 1:length(fruit)
    fruit{i}(fruit{i} == 'a') == 'o';

Q 27 / 64

Matlab

Which statement returns the roots for the polynomial `x^2 + 2x - 4`?

1.

poly([1 2 -4])

2.

solve(x^2 + 2x - 4 == 0)

3.

polyfit(x^2 + 2x - 4 == 0)

4.

roots([1 2 -4])

Q 28 / 64

Matlab

Which choice is the proper syntax to append a new elements `a` to the end of 1x 2 dimensional cell array `C`?

1.

C = {C a};

2.

C = cellcat(C a)

3.

C = cat(2, {a}, C)

4.

C{end+1}=a

Q 29 / 64

Matlab

You have loaded a dataset of people's heights into a 100 x 1 array called `height`. Which statement will return a 100 x 1 array, `sim_height`, with values from a normal distribution with the same mean and variance as your height data?

1.

sim_height = std(height) + mean(height) * randn(100, 1);

2.

sim_height = mean(height) + std(height) * randn(100, 1);

3.

sim_height = randn(std(height), mean(height), [100, 1]);

4.

sim_height = randn(mean(height), std(height), [100, 1]);

Q 30 / 64

Matlab

Which statement returns a cell array of the strings containing '`burger`' from `menu`?

`menu = {'hot dog' 'corn dog' 'regular burger' 'cheeseburger' 'veggie burger'}`

1.

menu{strfind(menu, 'burger')}

2.

menu(strfind(menu, 'burger'))

3.

menu{contains(menu, 'burger')}

4.

menu(contains(menu, 'burger'))

Q 31 / 64

Matlab

What is the set of possible values that `a` may contain?

a = randi(10, [1, 10]); a(3) = 11; a(a>2) = 12;

1.

3, 4, 5, 6, 7, 8, 9, 10, 11, 12

2.

1, 2, 12

3.

2, 11, 12

4.

1, 12

Q 32 / 64

Matlab

Which statement is true about the sparse matrices?

1.

You can use the `sparse` function to remove empty cells from cell array variables.

2.

Sparse matrices always use less memory than their associated full matrices.

3.

Mixtures of sparse and full matrices can be combined in all of MATLAB's built-in arithmetic operations.

4.

The `sparse` function requires its input to be a full matrix with at least 50% zero elements.

Q 33 / 64

Matlab

Which statement using logical indices will result in an error?

`a = 1:10;`

1.

b = a(a ~= 11)

2.

b = a(a == 1)

3.

b = a(a>6 && a<9)

4.

b = a(a | 1)

Q 34 / 64

Matlab

Which statement turns `menu` into the variable `menu_string` below?

menu = {'hot dog' 'corn dog' 'regular burger' 'cheeseburger' 'veggie burger'} menu_string =     'hot dog      corn dog      regular burger      cheeseburger      veggie burger'

1.

menu_string = cell2mat(join(menu, newline))

2.

menu_string = cell2mat(join(menu, 'n'))

3.

menu_string = join(menu, newline)

4.

menu_string = cell2mat(pad(menu))

Q 35 / 64

Matlab

Which code snippet sets a new random seed based on the current time and saves the current settings of the random number generator?

`rng_settings_curr = rng('shuffle');`  rng(time()); rng_settings_curr = rng();    `rng_settings_curr = rand('shuffle');`  rng('shuffle'); rng_settings_curr = rng();

1.

undefined

2.


rng(time());
rng_settings_curr = rng();

3.

undefined

4.


rng('shuffle');
rng_settings_curr = rng();

Q 36 / 64

Matlab

You have a matrix `data` in which each column is mono audio recording from a room in your house. You've noticed that each column has a very different mean and when you plot them all on the same graph, the spread across the y axis make it impossible to see anything. You want to subtract the mean from each column. Which code block will accomplish this?

`data_nomean = data - repmat(median(data), size(data, 1), 1);`   `data_nomean = bsxfun(@minus, data, mean(data));`  data_nomean = zeros(size(data)); for i = 1:size(data, 1)     data_nomean(i, :) = data(i, :) - mean(data(i, :)); end    `data_nomean = zscore(data');`

1.

undefined

2.

undefined

3.


data_nomean = zeros(size(data));
for i = 1:size(data, 1)
    data_nomean(i, :) = data(i, :) - mean(data(i, :));
end

4.

undefined

Q 37 / 64

Matlab

Which code block results in an array `b` containing the mean values of each array within `C`?

b = zeros(1, size(C, 2)); for i_C = 1:size(C, 2)     b(i_C) = mean(C(i_C)); end    `b = cellfun(@mean, C);`  b = zeros(1, size(C, 1)); for i_C = 1:size(C, 1)     b(i_C) = mean(C{i_C}(:)); end    `b = cellfun(@(m) mean(m(:)), C)`

1.


b = zeros(1, size(C, 2));
for i_C = 1:size(C, 2)
    b(i_C) = mean(C(i_C));
end

2.

undefined

3.


b = zeros(1, size(C, 1));
for i_C = 1:size(C, 1)
    b(i_C) = mean(C{i_C}(:));
end

4.

undefined

Q 38 / 64

Matlab

Which statement creates a logical array that is 1 if the element in `passwords` contains a digit and 0 if it does not?

`passwords = {'abcd' '1234' 'qwerty' 'love1'};`

1.

contains(password, 'd')

2.

~isempty(regexp(passwords, 'd'))

3.

cellfun(@(x) ~isempty(regexp(x, 'd')), passwords)

4.

regexp(passwords, 'd')

Q 39 / 64

Matlab

Which is NOT a function that adds text to a plot?

1.

title

2.

text

3.

label

4.

legend

Q 40 / 64

Matlab

Which code block most likely produced this graph?

![MatLab Q39](images/matlab_Q39.jpg)  figure x = rand(10,10); r = corrcoef(x); surf(r) colorbar   figure x = rand(10,10); r = corrcoef(x); imagesc(r) colorbar

1.


figure
x = rand(10,10);
r = corrcoef(x);
surf(r)
colorbar

2.


figure
x = rand(10,10);
r = corrcoef(x);
imagesc(r)
colorbar

Q 41 / 64

Matlab

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

1.

figure files

2.

script files

3.

function files

4.

stored variable files

Q 42 / 64

Matlab

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?

`a = 1:10;`   `b = a(randi(10, 1, 10));`  m = perms(a); i = randi(factorial(10), 1); b = a(m(i, :))   b      = a(i);   b = a(randperm(10));

1.

undefined

2.


m = perms(a);
i = randi(factorial(10), 1);
b = a(m(i, :))

3.


[s, j] = sort(rand(10, 1));
b      = a(i);

4.


b = a(randperm(10));

Q 43 / 64

Matlab

Which statement returns 1 (true)?

a = 'stand' b = "stand"

1.

a == b

2.

ischar(b)

3.

length(a) == length(b)

4.

class(a) == class(b)

Q 44 / 64

Matlab

Which does E contain?

C = {'dog' 'cat' 'mouse'} D = {'cow' 'piranha' 'mouse'} E = setdiff(C,D)

1.

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

2.

E = {'mouse'}

3.

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

4.

E =

Q 45 / 64

Matlab

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

1.

Editor

2.

command window

3.

details

4.

workspace

Q 46 / 64

Matlab

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?

x = 9.0646 6.4362 7.8266 8.3945 5.6135 4.8186 2.8862 10.9311 1.1908 3.2586 y = 15.4357 11.0923 14.1417 14.9506 8.7687 8.0416 5.1662 20.5005 1.0978   coeff_line = polyfit(x,y,1) x_line = floor(min(x)):0.1:ceil(max(x)); y_line = polyval(coeff_line,x_line) figure; plot(x,y,'o') hold on plot(x_linemy_line)   figure plot(x,y,'o') coeff_line = polyfit(x,y,1); x_line = floor(min(x)):0.1:ceil(max(x)); y_line = polyval(coeff_line,x_line); plot(x_line,y_line)   figure plot(x,y) coeff_line = polyfit(x,y,1); x_line = floor(min(x)):0.1:ceil(max(x)); y_line = polyval(coeff_line,x_line); hold on; plot(x_line,y_line)   coeff_line = polyfit(x,y,1); x_line = floor(min(x)):0.1:ceil(max(x)); y_line = polyval(coeff_line,x_line); figure; plot(x,y,'o') hold on plot(x_line,y_line)

1.


coeff_line = polyfit(x,y,1)
x_line = floor(min(x)):0.1:ceil(max(x));
y_line = polyval(coeff_line,x_line)

figure; plot(x,y,'o')
hold on
plot(x_linemy_line)

2.


figure
plot(x,y,'o')

coeff_line = polyfit(x,y,1);
x_line = floor(min(x)):0.1:ceil(max(x));
y_line = polyval(coeff_line,x_line);
plot(x_line,y_line)

3.


figure
plot(x,y)

coeff_line = polyfit(x,y,1);
x_line = floor(min(x)):0.1:ceil(max(x));
y_line = polyval(coeff_line,x_line);
hold on; plot(x_line,y_line)

4.


coeff_line = polyfit(x,y,1);
x_line = floor(min(x)):0.1:ceil(max(x));
y_line = polyval(coeff_line,x_line);

figure; plot(x,y,'o')
hold on
plot(x_line,y_line)

Q 47 / 64

Matlab

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

a = [0 1 2 3; 4 5 6 7]; a = a^2;

1.

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

2.

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

3.

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

4.

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

Q 48 / 64

Matlab

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

1.

v = {1:10}

2.

v = [1-10]

3.

v = 1:10

4.

v = (10)

Q 49 / 64

Matlab

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

1.

7

2.

8

3.

17

4.

9

Q 50 / 64

Matlab

undefined

1.

Global variables have a higher performance overhead than persistent variables.

2.

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

3.

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

4.

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

Q 51 / 64

Matlab

How is the random seed for MATLAB's random number generator first initializedin a MATLAB Session?

1.

Seed is undefined until it is initialized by the user.

2.

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

3.

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

4.

Seed is set to a static default value on startup.

Q 52 / 64

Matlab

At what will MATLAB look first for a called function?

1.

functions on the path

2.

built-in functions

3.

functions within the current file

4.

functions within the current directory

Q 53 / 64

Matlab

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

function mystery_func(a) :     return a   function b = mystery_func(a)     b = a; end   def b = mystery_func(a)     b = a; end   function mystery_func(a)     b = a;     return b; end

1.


function mystery_func(a) :
    return a

2.


function b = mystery_func(a)
    b = a;
end

3.


def b = mystery_func(a)
    b = a;
end

4.


function mystery_func(a)
    b = a;
    return b;
end

Q 54 / 64

Matlab

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

a = [1 2; 3 4]; b = a(:,2); c = b + 3; a(1:2,1) = c;   a =     6   3     7   4   a =     5   2     7   4   a =     5     7   a =     6     7

1.


a =
    5   2
    7   4

2.


a =
    5
    7

3.


a =
    6
    7

4.

undefined

Q 55 / 64

Matlab

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.

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

2.

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

3.

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

4.

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

Q 56 / 64

Matlab

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

1.

`2*[1:5]+1`

2.

`1:2:9`

3.

`isodd(1:9)`

4.

`1:odd:9`

Q 57 / 64

Matlab

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?

h = ones(5,5)/25; imshow(imfilter(img,h));

1.

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

2.

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

3.

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

4.

`imfilter` is a function that always blurs the images.

Q 58 / 64

Matlab

What is the size of `b`?

a = [1 2 3]; b = repmat(a,2,3);

1.

1x3

2.

3x2

3.

2x3

4.

2x9

Q 59 / 64

Matlab

Which statement reverses vector `a`?

a = [ 1 2 3 4];

1.

reverse(a)

2.

a(end:- 1:1)

3.

rev(a)

4.

a(::-1)

Q 60 / 64

Matlab

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

1.

`c = [7,8,9]`

2.

`c = [7: 8: 9]`

3.

`c = [7; 8; 9]`

4.

`c = [7 8 9]`

Q 61 / 64

Matlab

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

1.

`who`

2.

`vars`

3.

`whos`

4.

`who all`

Q 62 / 64

Matlab

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.

which

2.

who

3.

lookfor

4.

what

Q 63 / 64

Matlab

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

1.

to ensure backward compatibility

2.

to avoid HDF5 overhead in MAT-file

3.

to include a variable greater that 2GB

4.

to use compression by default

Q 64 / 64

From what distribution does the `rand()` function return value?

Based on the code below, c is the _ of a.

What does the Profiler track?

Which code block contains the correct syntax for a `while` loop?

What does `b` contain?

You have written a function `myfun` and want to measure how long it takes to run. Which code segment will return in `t` the time in seconds it takes `myfun` to run?

What is `%%` used for?

what is the `.` character NOT used for?

Which function could you use for multiple linear regression?

For which of these arrays do `mean`, `median`, and `mode` return the same value?

You are in the middle of a long MATLAB session where you have performed many analyses and made many plots. You run the following commands, yet a figure window doesn't pop up on the top of your screen with your plot. What might be the issue?

How do you access the value for the field `name` in structure S?

What built-in definition does i have?

Which statement is equivalent to this for loop?

You have plotted values of cosine from -10 to 10 and want to change the x-axis tick marks to every pi, from -3*pi to 3*pi. Which statement will do that?

What is the value of `c`?

Which function CANNOT be used to randomly sample data?

Which choice is correct syntax for a `switch` statement?

What is the result of this code?

What is true of a handle class object?

Which choice has a different final result in `f10` than the other three?

Which choice will NOT give you a 5 x 5 identity matrix?

Which statement creates this structure?

`my_func` is a function as follows. What is the value of `a` at the end of the code beneath?

Which statement could create this cell array?

Which choice adds `b` to each row of `a`?

Which choice replaces all `a`s with `o`s?

Which statement returns the roots for the polynomial `x^2 + 2x - 4`?

Which choice is the proper syntax to append a new elements `a` to the end of 1x 2 dimensional cell array `C`?

You have loaded a dataset of people's heights into a 100 x 1 array called `height`. Which statement will return a 100 x 1 array, `sim_height`, with values from a normal distribution with the same mean and variance as your height data?

Which statement returns a cell array of the strings containing '`burger`' from `menu`?

What is the set of possible values that `a` may contain?

Which statement is true about the sparse matrices?

Which statement using logical indices will result in an error?

Which statement turns `menu` into the variable `menu_string` below?

Which code snippet sets a new random seed based on the current time and saves the current settings of the random number generator?

Which code block results in an array `b` containing the mean values of each array within `C`?

Which statement creates a logical array that is 1 if the element in `passwords` contains a digit and 0 if it does not?

Which is NOT a function that adds text to a plot?

Which code block most likely produced this graph?

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

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?

Which statement returns **1** (true)?

Which does E contain?

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

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?

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

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

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

undefined

How is the random seed for MATLAB's random number generator first initializedin a MATLAB Session?

At what will MATLAB look first for a called function?

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

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

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?

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

What is the size of `b`?

Which statement reverses vector `a`?

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

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

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?

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

You have plotted values of cosine from -10 to 10 and want to change the x-axis tick marks to every pi, from -3pi to 3pi. Which statement will do that?

Which statement returns 1 (true)?

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