Deck 15: Computational Engineering Tools: Matlab

Question 1

Which of the following MATLAB commands would calculate the value of $e ^ { x }$ ?

A) $e^{\wedge} x$
B) $\exp (x)$
C) $\exp ^{\wedge} \mathrm{x}$
D)exponent $(\mathrm{x})$

Answer 1

$\exp (x)$

Question 2

An M-file is used when you write a program that is more than a few lines long.

Answer 2

True

Question 3

Suppose you have defined $x = [ 1,2,3 ]$ and $y = [ 2,4,6 ]$ in the Command Window. Determine the result of the following MATLAB operation: $> > x + y$

A)ans $=3 \quad 6 \quad 9$
B)ans $=\begin{array}{llllll}1 & 2 & 3 & 2 & 4 & 6\end{array}$
C)ans $=612$
D)ans $=18$

Answer 3

ans $=3 \quad 6 \quad 9$

Question 4

If you define $x = 2 / 3$ , and then type format long, how will the value of x be displayed?

A) x = 0.66666666666666666666667
B) x = 0.66666666666667
C) x = 0.67000000000000
D) $x = 2 / 3$

Question 5

If you define $x = 2 / 3$ , and then type format short, how will the value of x be displayed?

A) x = 0.66666666667
B) x = 0.6667
C) x = 0.67
D) x $x = 2 / 3$

Question 6

The part of the screen where you enter variables and issue MATLAB commands is known as the

A) menu bar.
B) current folder.
C) command window.
D) command history window.

Question 7

You can transfer old commands from the Command History Window to the Command
Window.

Question 8

What is the MATLAB command for calculating standard deviation?

A) standard
B) stddev
D) std

Question 9

If you define $x = 2 / 3$ , and then type format rat, how will the value of x be displayed?

A) x = 0.66666666667
B) x = 0.6667
C) x = 0.67
D) x $x = 2 / 3$

Question 10

What is the MATLAB command for calculating the square root of a number?

Question 11

Suppose you have defined $x = [ 1,2,3 ] \text { and } y = [ 2,4,6 ]$ in the Command Window. Determine the result of the following MATLAB operation: $> > \mathbf { X } \cdot { } ^ { * } \mathbf { y }$

A) ans $=369$
B)ans $=2 \quad 8 \quad 18$
C)ans $=\begin{array}{llllll}1 & 2 & 3 & 2 & 4 & 6\end{array}$
D)ans $=6 \quad 12$

Question 12

If you define $x = 2 / 3$ , and then type format bank, how will the value of x be displayed?

A) x = 0.66666666667
B) x = 0.6667
C) x = 0.67
D) x $x = 2 / 3$

Question 13

To generate the set of x even numbers in the range of two to ten, what should you enter in the Command Window?

A) x = 2;2;10
B) x = 2:2:10
C) x = 2:10:2
D) x = 2,10,2

Question 14

Which of the following commands are commonly used while plotting in MATLAB?

A) plot
B) title
C) grid
D) all of the above

Question 15

To clear the contents of the Command Window, type:

A) clear
B) clr
C) clc
D) $\text { shift-c }$