Computer programing

1. University of Calgary 18/09/2012
Department of Mechanical and Manufacturing Engineering
Name: . . . . . . . . . . . . Please DO NOT SEPARATE these pages
At the end of the exam insert the answer (Scantron) page inside of this set of pages
Department of Mechanical and Manufacturing Engineering
Schulich School of Engineering
University of Calgary
Computing Tools for Engineering Design ‐ ENME 337 ‐ L2
“color”
Quiz #1 (MATLAB 1)
16 mult. choice questions ; Duration: 20 minutes
Note:
1. Several words in the following questions may have multiple meanings. Use the meaning rele‐
vant to MATLAB and its applications, or to the commonly used mathematics context.
2. Unless explicitly stated, assume in each problem that MATLAB is in its basic initial state, as
right after launching it, after turning the computer on.
Answer the questions by marking the “bubbles” on the sheet for computerized evaluation
(Scantron). Use No. 2 pencil.
continued ...

2. 2
Q1. Executing in the Command Window the following code
a = (1:3)’ ; (a(1,2))’
returns
a. error message
b. 1
c. 2
d. 1 2
e. none of above
Q2. Executing in the Command Window the following code
a = ones(3,4) ; b = a(4,3) , size(b);
returns
a. 1
b. ‐1
c. 1 1
d. error message
e. none of the above
Q3. Executing the command iskeyword size returns 0, i.e., size is not a MATLAB keyword. Given
this information, which of the following statements shows the result of executing the following line
in the Command Window
size = (1:3)’ ; size(size)
a. wrong result (i.e., at least one of the commands should not be used in MATLAB)
b. 1 2
c. 2 1
d. 2 2
e. none of above
continued ...

3. 3
Q4. Executing in the Command Window the following code
a = [1:2]’ ; size(a)
returns
a. error message
b. 1 2
c. 2 1
d. 2
e. none of above
Q5. Executing in the Command Window the following code
a = 1:2 ; size[a]
returns
a. error message
b. 1 2
c. 2 1
d. 2
e. none of above
Q6. The following lines show collections of characters (e.g., _xm, m3) that either can or can not be
valid names of MATLAB variables. Which line contains EXCLUSIVELY valid names ?
a. _xm m3, abc, a_B (wrong, but accepted in Quiz 1 ‐> “ _ “ not allowed as 1st
char of var. name)
b. m3, 3_m, m_3, aB
c. AA, for, a‐b, ab
d. AA, BB, m3, a‐B
e. none of above
continued ...

4. 4
Q7. Which of the following statements is correct ?
a. Function “clear” clears only the scalar variables, but does not clear arrays
b. Function “clc” clears all variables
c. Function “clc” clears only constants
d. Function “clear a” clears all variables of the type “array”
e. None of the above
Q8. Executing in the Command Window the following code
A = eye(1,10) ; size(A(2,2))
returns
a. 1
b. 0
c. error message
d. 1 1
e. none of the above
Q9. Executing in the Command Window the following code
A = [1:1:5;;2:1:6] ; size(A)
returns
a. 2 5
b. 5 2
c. error message
d. 3 5
e. none of the above
continued ...

5. 5
Q10. Executing the command iskeyword sin returns 0, i.e., sin is not a MATLAB keyword. Given this
information, which of the following statements shows the result of executing, in the Command
Window, of the line
sqrt(sin(‐pi/2)) ; sin = size(1:5)
a. wrong result (i.e., at least one of the commands should not be used)
b. 1
c. 1 5
d. i
e. none of above
Q11. Which of the following statements is correct ?
a. Function “who” returns the name of the currently logged user
b. Function “who” returns the name of the system administrator
c. Function “whos” displays the user IDs for all accounts on the computer
d. Function “who” displays the web address of the system administrator
e. None of the above
Q12. After executing the following script file in MATLAB
x = [2:4 ; ‐1:1 ; 1 2 3];
y=x(2,:);
size(y')
the displayed result is
a. 2 2
b. 3 1
c. 2 1
d. 1 3
e. none of above
continued ...

6. 6
Q13. After executing the following script file in MATLAB
x = 3i;
y = x/2*sqrt(‐1);
z = x + y
the displayed result is
a. 1.5 + 3 i
b. error message
c. 3 + 1.5 i
d. ‐1.5 + 3 i
e. none of above
Q14. After executing the following script file in MATLAB
x = ‐i;
y = x*sqrt(‐1);
x + y
the displayed result is
a. error message
b. ‐i
c. i
d. 1 ‐ 1 i
e. none of above
Q15. Executing in the Command Window the following code
y = a + b , a = 2 ; b = sqrt(‐4) ;
returns
a. 2 + 2 i
b. 2 ‐ 2 i
c. error message
d. NaN
e. none of the above

7. 7
Q16. Executing in the Command Window the following code
x = [1:3.4; -6:3.5:0.5] ; size(x)
returns
a. error message
b. 2 2
c. 2 3
d. 3 3
e. none of the above