4th Matlab MCQ

mandatory answer

Question 1

Enter your name :

Question 2

When specifying format to fprintf function, %c stands for :

sequence of characters

floating point numbers

integers

Question 3

When specifying format to fprintf function, %f stands for :

sequence of characters

floating point numbers

integers

Question 4

what do the following statements do :
fid=fopen('tempfile2.txt', 'w');
fprintf(fid, '%7.3f', 1.123456789);
fclose(fid);

nothing

create a text file and write 1.123456789 into it

create a text file and write 1.123 into it

create a text file and write 1.123e0 into it

create a file and write the floating point number 1.123456789 in binary format into it

Question 5

What is the best function to read a file, line by line (formated data) ?

fgetl

fread

fscanf

uncheck

Question 6

What is the best function to read a table (=array) into a file (data are in readable text format) ?

fgetl

fread

fscanf

uncheck

Question 7

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

fgetl

fread

fscanf

uncheck

Question 8

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

Question 9

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 good 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 10

A=magic(9); %it 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 11

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);

4th Matlab MCQ

Enter your name :

When specifying format to fprintf function, %c stands for :

When specifying format to fprintf function, %f stands for :

what do the following statements do :fid=fopen('tempfile2.txt', 'w');fprintf(fid, '%7.3f', 1.123456789);fclose(fid);

What is the best function to read a file, line by line (formated data) ?

What is the best function to read a table (=array) into a file (data are in readable text 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 good size.

A=magic(9); %it 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 ?

what do the following statements do :
fid=fopen('tempfile2.txt', 'w');
fprintf(fid, '%7.3f', 1.123456789);
fclose(fid);

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 good size.

A=magic(9); %it 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 ?