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3rd Matlab MCQ

For each question, click on the correct solutions(s). One or more propositions can be correct.

mandatory answer

Question 1

Enter your name :

Question 2

What action do the "cleaning" of a signal (i.e. removing parasitic effects like combination with other carriers or removing most of the noise) ?

The integration of the signal

The substraction of signals

The filtering of the signal

The sampling the signal

Question 3

a=1:2:99
what does the following do ?
a(length(a)/2-3 : length(a)/2 + 3 )

returns an error

returns the array [48 49 50 51 52 53]

returns the array [47 48 49 50 51 52 53]

returns the array [1 2 3 4 5 6]

returns the array [1 2 3 4 5 6 7]

returns the array [45 47 49 51 53 55]

returns the array [43 45 47 49 51 53 55]

Question 4

Which function(s) can read into a file ?

fopen

fclose

fprintf

fgetl

fread

fwrite

ftell

fseek

Question 5

Which function(s) can write binary or text to a file ?

fopen

fclose

fprintf

fgetl

fread

fwrite

ftell

fseek

Question 6

Which statement(s) is/are correct to open a file and READ data ?

fid=fopen('file.txt', 'r'); data=fscanf(fid, '%f');

fid=fopen('file.txt', 'r'); data=fgetl(fid);

fid=fopen('file.txt', 'w'); data=fscanf(fid, '%f');

fid=fopen('file.txt', 'w'); data=fgetl(fid);

Question 7

thanks to the GUIDE tool, you can:

create a window and add controls to it, such as buttons, ploting areas, labels, comboboxes, ...

call asynchronously (=whenever you want) some matlab code

do toasts and coffee

create user friendly interfaces for windows environment

Question 8

If you want to access data (variables and/or controls) accross different callback functions you can :

do it without specifying anything (since all variables are accessible evrywhere in the code)

use the keyword "global" to access user defined variables (if defined once as global)

use the keyword "global" to access controls (such as button, ...)

use the object "handles" which is always defined for a callback function

Question 9

Which statement will save data into handles in order to share it between callbacks and in the entire code :
(only 1 solution)

handles.data=value; share(handles);

handles.data=value; guidata(hObject, handles);

handles.data=value; uigetfile(handles);

uncheck

Question 10

How to transpose 'A' (simple transposition not complex transposition) ?

A.'

transpose(A)

t(A)

Question 11

In a conditional structure, which comparison(s) is/are correct ('a' and 'b' are numbers, not matrices)

a=b

a<=b

a!=b

a''&b

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