LinkedIn skill assessment answers and questions — MATLAB
หากคุณกำลังมองหา LinkedIn skill assessment answers และ คำถาม – MATLAB, คุณมาถูกที่แล้ว. ในบล็อกโพสต์นี้, I will share with you some of the most common and challenging questions that you may encounter in the MATLAB skill assessment test, along with the correct answers and explanations.
This will help you prepare for the test and boost your chances of getting a high score. Whether you are a beginner or an expert in MATLAB, you will find this post useful and informative. Read on to learn more about the LinkedIn skill assessment answers และ คำถาม – MATLAB.
Q1. From what distribution does the rand()
function return value?
- normal
- poisson
- binomial
- uniform
Based on the code below, c is the _ of a.
Q2.a = rand(1, 11);
b = sort(a);
c = b(1, ceil(end/2));
- ค่ามัธยฐาน
- โหมด
- หมายถึง
- margin
What does the Profiler track?
Q3.- execution time
- command history
- ข้อผิดพลาด
- the value of variables
Which code block contains the correct syntax for a while
loop?
Q4. - NS
a = 0;
do
a = a + 1;
while a < 5
end
- NS
a = 0;
while(a < 5)
a = a + 1;
- ค
a = 0;
while a < 5:
a = a + 1;
- NS
a = 0;
while a < 5
a = a + 1;
end
What does b
contain?
Q5. 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
- NS
b =
56 0
9 8
- NS
b =
8 19
19 46
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?
Q6. - NS
t = cputime(myfun());
- NS
tic;
myfun();
toc;
- ค
timer.start;
myfun()
t = timer.stop;
- NS
t = timer(myfun());
%%
used for?
Q7. คืออะไร - argument placeholder
- block quotes
- code sections
- conversion specifier
what is the .
character NOT used for?
Q8. - structure field access
- a decimal point
- cell array access
- element-wise operations
Which function could you use for multiple linear regression?
คำถามที่ 9.- polyval
- regress
- solve
- polyfit
For which of these arrays do mean
, median
, และ mode
return the same value?
Q10. - [0 1 1 1 2]
- [1 3 5 5 6]
- [0 1 1 1 1]
- [0 0 5 5 5]
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?
คำถามที่ 11.x = [-1:0.1:1];
y = X.^2;
plot(x, y)
- Your plot doesn’t plot in a figure window because
figure
was not called immediately in advance. - ของคุณ
plot
syntax is incorrect. - Your plot is in a figure window that was already open, hidden behind other windows on your screen.
- Your plot was saved to an image file but not displayed.
How do you access the value for the field name
in structure S?
Q12. - NS[‘name’]
- S.name
- NS(‘name’)
- NS{‘name’}
What built-in definition does i have?
ไตรมาสที่ 13.- basic imaginary unit
- index function
- infinity
- index variable
Which statement is equivalent to this for loop?
คำถามที่ 14.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
- b = a*a;
- b = a.^2;
- b = a^2;
- b = pow2(เอ);
You have plotted values of cosine from -10 ถึง 10 and want to change the x-axis tick marks to every pi, จาก -3pi to 3pi. Which statement will do that?
Q15.- xticks(-3pi:3.14:3pi)
- xticks(-3pi:pi:3pi)
- xticks(linespace(-3pi(), 3pi(), pi()))
- xticks(linespace(-3pi, 3pi, pi)
What is the value of c
?
Q16. a = ones(1,3);
b = 1:3;
c = conv(a,b)
- [-1 2 -1]
- [1 3 6 5 3]
- 6
- [1 -2 1]
Which function CANNOT be used to randomly sample data?
ไตรมาสที่ 17.- datasample
- randi
- resample
- randperm
Which choice is correct syntax for a switch
คำแถลง?
Q18. - NS
x = 7;
switch x
case 2
disp("two");
otherwise
disp("not two");
end
- NS
x = 7;
switch x :
case 2
disp("two");
otherwise
disp("not two");
end
- ค
x = 7;
switch x
case 2
disp("two");
else
disp("not two");
end
- NS
x = 7;
switch x
case 2
disp("two");
default
disp("not two");
end
What is the result of this code?
Q19.a = 1;
b = 2;
c = 3;
d = 4;
e = c / (~a - b == c - d);
- ข้อผิดพลาด
- NS
c =
NaN
- ค
c =
Inf
- NS
c =
-0.2500
What is true of a handle class object?
ไตรมาสที่ 20.- When you pass a handle object to a function, a new object is made that is independent of the original.
- All copies of handle objects refer to the same underlying object.
- Handle object cannot reference one another.
- Handle object do not have a default
eq
การทำงาน.
Which choice has a different final result in f10
than the other three?
Q21. - NS
f10 = 1;
for i = 1:10
f10 = f10 * i;
end
- NS
f10 = factorial(10)
- ค
f10 = 1;
i = 1;
while i <= 10
i = i + 1;
f10 = i * f10;
end
- NS
f10 = prod(1:10)
Which choice will NOT give you a 5 NS 5 identity matrix?
Q22.- NS
a = rand(5);
round(a * inv(a))
- NS
diag(ones(5, 1))
- ค
identity(5)
- NS
eye(5)
Which statement creates this structure?
Q23.dog =
name: 'Bindy'
breed: 'border collie'
weight: 32
- NS
dog = struct('name', 'Bindy'; 'breed', 'border collie'; 'weight', 32);
- NS
dog.name = 'Bindy';
dog.breed = 'border collie';
dog.weight = 32;
- ค
dog = {
'name' : 'Bindy',
'breed' : 'border collie',
'weight': 32;
}
- NS
dog('name') = 'Bindy';
dog('breed') = 'border collie';
dog('weight') = 32;
my_func
is a function as follows. What is the value of a
at the end of the code beneath?
Q24. function a = my_func(a)
a = a + 1;
end
------------------
a = 0;
for i = 1:3
my_func(a);
end
a = my_func(a);
- 4
- 3
- 0
- 1
Which statement could create this cell array?
Q25.c = {["hello world"]} {1×1 cell} {["goodbye"]} {1×3 double}
- c =
{"hello world" {"hello"} "goodbye" [1 2 ]};
- c =
{"hello world" {"hello"} "goodbye" {[1 2 3]}};
- c =
{"hello world" {"hello"} "goodbye" [1 2 3]};
- c =
{"hello world" {"hello" "hello"} "goodbye" {[1 2 3]}};
Which choice adds b
to each row of a
?
Q26. a = ones(4, 4);
b= [1 2 3 4];
- a = a + reshape(ข, 4, 1);
- a = a + b’;
- a = a + repmat(ข, 4, 1);
- a = a + [b b b b];
Which choice replaces all a
s with o
NS?
Q27. - NS
for i = 1:length(fruit)
fruit{i}(fruit{i} == a) == o;
end
- NS
for i = 1:length(fruit)
fruit(i)(fruit(i) == 'a') == 'o';
end
- ค
for i = 1:length(fruit)
fruit{i}(fruit{i} == 'a') == 'o';
end
- NS
for i = 1:length(fruit)
fruit{i}(fruit{i} == 'a') == 'o';
Which statement returns the roots for the polynomial x^2 + 2x - 4
?
Q28. - poly([1 2 -4])
- solve(x^2 + 2NS – 4 - 0)
- polyfit(x^2 + 2NS – 4 - 0)
- ราก([1 2 -4])
Which choice is the proper syntax to append a new elements a
to the end of 1x 2 dimensional cell array C
?
Q29. - C = {C a};
- C = cellcat(C a)
- C = cat(2, {เอ}, ค)
- ค{end+1}=a
You have loaded a dataset of people’s heights into a 100 NS 1 array called height
. Which statement will return a 100 NS 1 array, sim_height
, with values from a normal distribution with the same mean and variance as your height data?
ไตรมาสที่ 30. - sim_height = std(สามารถใช้สี่เหลี่ยมจัตุรัสหรือสี่เหลี่ยมจัตุรัสของอาร์ชิเตสเพื่อวัดได้) + หมายถึง(สามารถใช้สี่เหลี่ยมจัตุรัสหรือสี่เหลี่ยมจัตุรัสของอาร์ชิเตสเพื่อวัดได้) * randn(100, 1);
- sim_height = mean(สามารถใช้สี่เหลี่ยมจัตุรัสหรือสี่เหลี่ยมจัตุรัสของอาร์ชิเตสเพื่อวัดได้) + std(สามารถใช้สี่เหลี่ยมจัตุรัสหรือสี่เหลี่ยมจัตุรัสของอาร์ชิเตสเพื่อวัดได้) * randn(100, 1);
- sim_height = randn(std(สามารถใช้สี่เหลี่ยมจัตุรัสหรือสี่เหลี่ยมจัตุรัสของอาร์ชิเตสเพื่อวัดได้), หมายถึง(สามารถใช้สี่เหลี่ยมจัตุรัสหรือสี่เหลี่ยมจัตุรัสของอาร์ชิเตสเพื่อวัดได้), [100, 1]);
- sim_height = randn(หมายถึง(สามารถใช้สี่เหลี่ยมจัตุรัสหรือสี่เหลี่ยมจัตุรัสของอาร์ชิเตสเพื่อวัดได้), std(สามารถใช้สี่เหลี่ยมจัตุรัสหรือสี่เหลี่ยมจัตุรัสของอาร์ชิเตสเพื่อวัดได้), [100, 1]);
Which statement returns a cell array of the strings containing ‘burger
‘ จาก menu
?
ไตรมาสที่ 31. menu = {'hot dog' 'corn dog' 'regular burger' 'cheeseburger' 'veggie burger'}
- เมนู{strfind(เมนู, ‘burger’)}
- เมนู(strfind(เมนู, ‘burger’))
- เมนู{ประกอบด้วย(เมนู, ‘burger’)}
- เมนู(ประกอบด้วย(เมนู, ‘burger’))
What is the set of possible values that a
may contain?
Q32. a = randi(10, [1, 10]);
a(3) = 11;
a(a>2) = 12;
- 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
- 1, 2, 12
- 2, 11, 12
- 1, 12
Which statement is true about the sparse matrices?
Q33.- คุณสามารถใช้
sparse
function to remove empty cells from cell array variables. - Sparse matrices always use less memory than their associated full matrices.
- Mixtures of sparse and full matrices can be combined in all of MATLAB’s built-in arithmetic operations.
- NS
sparse
function requires its input to be a full matrix with at least 50% zero elements.
Which statement using logical indices will result in an error?
คำถามที่ 34.a = 1:10;
- b = a(a ~= 11)
- b = a(a == 1)
- b = a(เอ>6 && เอ<9)
- b = a(เอ | 1)
Which statement turns menu
into the variable menu_string
ด้านล่าง?
Q35. menu = {'hot dog' 'corn dog' 'regular burger' 'cheeseburger' 'veggie burger'}
menu_string =
'hot dog
corn dog
regular burger
cheeseburger
veggie burger'
- menu_string = cell2mat(join(เมนู, newline))
- menu_string = cell2mat(join(เมนู, ‘\n’))
- menu_string = join(เมนู, newline)
- menu_string = cell2mat(pad(เมนู))
Which code snippet sets a new random seed based on the current time and saves the current settings of the random number generator?
Q36.-
rng_settings_curr = rng('shuffle');
- NS
rng(time());
rng_settings_curr = rng();
- ค
rng_settings_curr = rand('shuffle');
- NS
rng('shuffle');
rng_settings_curr = rng();
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?
Q37. -
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');
Which code block results in an array b
containing the mean values of each array within C
?
Q38. - .
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)
Which statement creates a logical array that is 1 if the element in passwords
contains a digit and 0 if it does not?
Q39. passwords = {'abcd' '1234' 'qwerty' 'love1'};
- ประกอบด้วย(รหัสผ่าน, ‘\d’)
- ~isempty(regexp(รหัสผ่าน, ‘\d’))
- cellfun(@(NS) ~isempty(regexp(NS, ‘\d’)), รหัสผ่าน)
- regexp(รหัสผ่าน, ‘\d’)
Which is NOT a function that adds text to a plot?
Q40.- RSS เป็นข้อความธรรมดารูปแบบ XML
- ข้อความ
- label
- legend
Which code block most likely produced this graph?
Q41.-
figure
x = rand(10,10);
r = corrcoef(x);
surf(r)
colorbar
-
figure
x = rand(10,10);
r = corrcoef(x);
imagesc(r)
colorbar
What kind of files are stored with the .mat extension?
Q42.- figure files
- script files
- function files
- stored variable files
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?
Q43.a = 1:10;
- :
b = a(randi(10, 1, 10));
- :
m = perms(a);
i = randi(factorial(10), 1);
b = a(m(i, :))
- :
[s, j] = sort(rand(10, 1));
b = a(i);
- :
b = a(randperm(10));
Which statement returns 1 (จริง)?
Q44.a = 'stand'
b = "stand"
- a == b
- ischar(ข)
- ความยาว(เอ) == length(ข)
- ระดับ(เอ) == class(ข)
Which does E contain?
Q45.C = {'dog' 'cat' 'mouse'}
D = {'cow' 'piranha' 'mouse'}
E = setdiff(C,D)
- E = {‘cat’} {‘dog’}
- E = {‘mouse’}
- E = {‘cat’} {‘cow’} {‘dog’} {‘piranha’}
- E =
Where in the UI can you see what variables have been created, their values, and their class?
Q46.- Editor
- command window
- รายละเอียด
- workspace
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?
Q47.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)
If you run this piece of code, you will get an error. ทำไม?
Q48.a = [0 1 2 3; 4 5 6 7];
a = a^2;
- 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.
Which command will create a 10-element vector v with values from 1 ถึง 10?
Q49.- v = {1:10}
- v = [1-10]
- v = 1:10
- v = (10)
array, the two subscript index (4,2) indexes the same location as linear index ___
.
Q50. สำหรับ 5 NS 5 - 7
- 8
- 17
- 9
What is a difference between global variable and persistent variables?
คำถามที่ 51.- 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.
How is the random seed for MATLAB’s random number generator first initializedin a MATLAB Session?
คำถามที่ 52.- 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.
At what will MATLAB look first for a called function?
Q53.- functions on the path
- built-in functions
- functions within the current file
- functions within the current directory
Which choice is the correct syntax for declaring a function that returns the input value as the output?
คำถามที่ 54.- :
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
What is the state of a at the end of this code?
Q55.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
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?
Q56.-
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 ถึง 9?
Q57.-
2*[1:5]+1
-
1:2:9
-
isodd(1:9)
-
1:odd:9
In MATLAB, ที่ 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?
Q58. h = ones(5,5)/25;
imshow(imfilter(img,h));
-
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.
What is the size of b
?
Q59. a = [1 2 3];
b = repmat(a,2,3);
- 1×3
- 3×2
- 2×3
- 2×9
Which statement reverses vector a
?
Q60. a = [ 1 2 3 4];
- ย้อนกลับ(เอ)
- เอ(จบ:- 1:1)
- rev(เอ)
- เอ(::-1)
Which command will create a column vector with the values 7, 8, และ 9?
Q61.-
c = [7,8,9]
-
c = [7: 8: 9]
-
c = [7; 8; 9]
-
c = [7 8 9]
What do you call in the command window to see all the variables in the workspace and their classes?
Q62.-
who
-
vars
-
whos
-
who all
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?
Q63. - ที่
- ใคร
- lookfor
- อะไร
What is a reason to save a MAT-file using the -v7.3
flag?
Q64. - to ensure backward compatibility
- to avoid HDF5 overhead in MAT-file
- to include a variable greater that 2GB
- to use compression by default
Which choice cannot add a directory to the search path?
Q65.- ที่ เส้นทาง การทำงาน
- ที่ savepath การทำงาน
- โดยใช้ Set Path บทความนี้จะตอบคำถามของคุณเกี่ยวกับ สิ่งแวดล้อม เมนู
- ที่ addpath การทำงาน
Which is not a function to plot three-dimensional data?
Q66.- mesh
- surf
- contour
- grid
What is the reason to save a MAT-file using the v-7.3 flag?
Q67.- to use compression by default
- to ensure backward compatibility
- to include a variable greater than 2GB
- to avoid HDF5 overhead in MAT-file
This graph could be the result of which block of code?
Q68.-
a = randn(1,1000); histogram(a) ylabel('counts')
-
a = rand(1,1000); histogram(a) ylabel('counts')
-
a = randi(1,1000); histogram(a) ylabel('counts')
-
a = rng(1,1000); histogram(a) ylabel('counts')
What is a key difference between && และ &?
Q69.- && is a logical operator and & ไม่ใช่.
- && is always slower than &
- && employs short-circuiting behavior and & ไม่.
- && is a bitwise operator and & ไม่ใช่.
What is the result of this code?
Q70.s="abcd"; s(3)='x'
- “abxd”
- abxd
- a 1x 3 string array
- a run-time error
In which case would you use varargin in a function you write?
Q71.- You want to count the number of input arguments.
- You want to include optional input arguments.
- You want the workspace variable names of the input arguments.
- You want the data types of the input arguments.
What does e contain?
Q72.c = [9 8 0];
d = [0 0 1];
e = union(c,d);
-
e = [0 0 1 9 8 0]
-
e = [9 8 0 0 0 1]
-
e = [0 1 8 9]
-
e = [1 8 9]
What does this function print?
Q73.a = 1;
for i_loop = 1:6
disp(a);
end
- :
111111
- :
1 1 1 1 1 1
- :
1
1
1
1
1
1
- :
nothing will print
You are debugging a function and have set a breaipoint on the line before the error occurs. You look at the variable values and suspect the cause of the error is that a is 9 but should be 10. The next statement after the breakpoint will use a. Wigh action would help you test if a=10 solves the problem?
Q74.- พิมพ์ “a=10;” into the function file, before the statement that’s throwing an error. Then click the Run button in the debugger window.
- พิมพ์ “a=10; continue;” into the command window
- พิมพ์ “a=10;” into the command window. Then click the Run button in the debugger window
- พิมพ์ “a=10;” into the function file, before the statement that’s throwing an error. Then type “กลับ;” into the command window
Which statement returns the character array ‘alone’?
Q75.b = ['stand' 'alone'];
- ข(7:11)
- ข(2)
- ข(6:จบ)
- ข(1,2)
Which statement returns the character array ‘alone’?
Q76.c = {rand(20,10) rand(23,2) rand(14,5)}
- :
b = cellfun(@(m) mean(m(:)), C
- :
b = zeros(1, size(C,1);
for i_C = 1:size(C,1)
b(1_C) = mean(C{i_C}(:));
end
- :
b = cellfun(@mean, C)
- :
b = zeros(1, size(C,2);
for i_C = 1:size(C,2)
b(1_C) = mean(C(i_C));
end
Which choice uses the proper syntax for an if else
คำแถลง?
Q77. - :
if (a > 1):
b = 2;
else:
b = 3;
- :
if (a > 1){
b = 2;
} else{
b = 3;
}
- :
if (a > 1)
b = 2;
else
b = 3;
end
- :
if (a > 1)
b = 2;
else
b = 3;
What does b contain?
Q78.a = [9 8 8 19 6 1 9 6 6 19];
b = unique(a);
-
b = [1 6 8 9 19]
-
b = [1 6 8 9]
-
b = [1 6 6 6 8 8 9 9 19 19]
-
b = [1 6 6 8 8 9]
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