5th Matlab MCQ

mandatory answer

Identification

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Question 1

What is the best function to read a file, line by line (file is in readable text/ASCII format)?

fgetl

fread

fscanf

uncheck

Question 2

What is the best function to read data into a file and return an array of them (data types are known and are in readable text/ASCII format)?

fgetl

fread

fscanf

uncheck

Question 3

What is the best function to read binary data into a file?

fgetl

fread

fscanf

uncheck

Question 4

How to draw a 3D object or a mesh or polygons?

poly(X, Y, Z, C); where 'X','Y','Z' contains coordinates of vertices of objects to draw and 'C' their colours

patch(X, Y, Z, C); where 'X','Y','Z' contains coordinates of vertices of objects to draw and 'C' their colours

plot3(X, Y, Z, C); where 'X','Y','Z' contains coordinates of vertices of objects to draw and 'C' their colours

patch('Vertices', verts, 'Faces', faces); where 'faces' is an array of indices pointing to the rows of 'verts'. 'verts' contains coordinates of points to draw

Question 5

How to initialize an array ('a') with 1 x n values (1 line of n columns).Values can be 0, 1 or whatever, the most important is to initialize the array with the right size.

a=zeros(n)

a=ones(n)

a=size(n)

a=new array(n)

a=array(n)

a=zeros(1,n)

a=ones(1,n)

a=size(1,n)

a=new array(1,n)

a=array(1,n)

a=zeros(n,1)

a=ones(n,1)

a=size(n,1)

a=new array(n,1)

a=array(n,1)

Question 6

A=magic(9); % returns a 9x9 array
We want to pick the columns 3 to 6 and the rows 3, 6 and 9, and put the values into a new array, 'B'.
Which statement(s) is/are correct?

B=A(3:9, 3:6)

B=A(3,6,9, 3:6)

B=A([3,6,9], 3:6)

B=A(3, 3:6)+A(6, 3:6)+A(9, 3:6)

B=A(3, 3:6)'&A(6, 3:6)'&A(9, 3:6)

B=[]; for I=3:3:9, B=[B; A(I, 3:6)]; end

I=3; B=[]; while(I<=9), B=[B; A(I, 3:6)]; I=I+3;end

Question 7

Which statement(s) create(s) a break in the execution of Matlab and force it to wait 8 seconds before continuing?

pause(8);

break(8);

wait(8);

Question 8

In a conditional structure, which comparison(s) is/are correct ('a' and 'b' are real numbers)?

a=b

a<=b

a!=b

a'&b

5th Matlab MCQ

What is the best function to read a file, line by line (file is in readable text/ASCII format)?

What is the best function to read data into a file and return an array of them (data types are known and are in readable text/ASCII format)?

What is the best function to read binary data into a file?

How to draw a 3D object or a mesh or polygons?

How to initialize an array ('a') with 1 x n values (1 line of n columns).Values can be 0, 1 or whatever, the most important is to initialize the array with the right size.

A=magic(9); % returns a 9x9 arrayWe want to pick the columns 3 to 6 and the rows 3, 6 and 9, and put the values into a new array, 'B'.Which statement(s) is/are correct?

Which statement(s) create(s) a break in the execution of Matlab and force it to wait 8 seconds before continuing?

In a conditional structure, which comparison(s) is/are correct ('a' and 'b' are real numbers)?

A=magic(9); % returns a 9x9 array
We want to pick the columns 3 to 6 and the rows 3, 6 and 9, and put the values into a new array, 'B'.
Which statement(s) is/are correct?