Matlabtest1

Front 1

1. Computers were originally conceived as tools for solving specific problems

Back 1

True

Front 2

Bill Gates designed the first working computer.

Back 2

False.
Although Charles Babbage is usually credited with the design of the first computer, one could argue that the counting boards in use in 500 BC from which the abacus was derived would qualify as a computer design.

Front 3

Programs cannot interact with the world outside the computer without an operating system.

Back 3

False.
Operating systems arrived on the scene quite late in the development of computers. Before then, the computer ran one application that did all the work, and
this is still possible today.

Front 4

Programs cannot interact with the world outside the computer without drivers.

Back 4

False.
The driver is just a pluggable operating system component.

Front 5

Programs cannot interact with the world outside the computer without hardware interfaces.

Back 5

True.
For a computer to be useful there has to be hardware to carry data to and from the processor.

Front 6

Application programs have access to shared memory.

Back 6

True

Front 7

An algorithm bridges the gap between the available data and the result to be achieved.

Back 7

False.
A solution solves the whole problem by assembling solutions to manageable subproblems. An algorithm is a series of steps to solve a small subproblem.

Front 8

A computer language is not a(n) ________exercise; it is a
________tool for communication and problem solving.

Back 8

1. theoretical; practical

Front 9

Together with the use of binary encoding for storing numerical values,___________ was the genesis of general-purpose computing as we know it today.

Back 9

2. the Von Neumann architecture

Front 10

Most operating systems today use ___________, which is
actually a data file containing an image of everything you would like to have in RAM.

Back 10

3. virtual memory

Front 11

Operating systems contain a group of programs called
__________that allow you to perform functions such as
printing, copying files, and listing the file names.

Back 11

4. utilities

Front 12

Many __________are loaded automatically when the
operating system starts, and others are loaded upon user request.

Back 12

5. application programs

Front 13

Even when a program appears to execute properly, you must check the results carefully to find__________ errors.

Back 13

6. logic

Front 14

Problem solving is the process of designing a collection of ______________.

Back 14

7. solutions to subproblems

Front 15

The process of problem solving is a search for a match between ___________ one can achieve from the given data and ____________ from which the answer can be achieved.

Back 15

8. states;
states

Front 16

A bag of groceries is an example of abstraction.

Back 16

True.

Front 17

An algorithm is a series of logical steps that solves one specific problem.

Back 17

False. Written correctly, algorithms can be generalized to solve a range of subproblems..

Front 18

It is impossible to write a complete, practical program in any paradigm other than procedural.

Back 18

3. True.
Both functional and object-oriented programs require procedural components to function on a processor.

Front 19

4. To be useful to an algorithm, the result of every computation must be assigned to a variable.

Back 19

True.

Front 20

5. In programming, if you know the values of z and x in the expression z = x + y, you can derive the value of y.

Back 20

False.
This is merely the assignment of the sum of x and y to z; you cannot make any inference about the value of y from this expression.

Front 21

6. Untyped languages are free to ignore the nature of the data in variables.

Back 21

False.
Untyped languages merely leave the programmer free of needing to define the type of data. The CPU has to have information about the nature of each data item in order to process it correctly.

Front 22

7. Anything assigned to be the value of a variable is an object.

Back 22

True.

Front 23

8. Class is a concept restricted to object-oriented programming.

Back 23

False.
In general, especially in MATLAB, the class of an item refers to its data type. The more restrictive definition combining the data type with the operations performed on it is an OOP restriction.

Front 24

9. You can permanently save the commands entered in the Command window.

Back 24

False.
You must use scripts for permanent command storage.

Front 25

10. Double-clicking an entry in the Command History window lets you rerun that command.

Back 25

True.

Front 26

11. You can manually change the values of variables displayed in the Workspace window.

Back 26

True.
Clicking the icon to the left brings up the Document window

Front 27

12. You double-click a file name in the Current Directory window to run that script.

Back 27

False.
Double-clicking a file name opens the file in the editor.

Front 28

13. A Document window lets you view and edit data items.

Back 28

True.

Front 29

14. MATLAB permits multiple Graphics windows to be open simultaneously.

Back 29

True.

Front 30

15. An asterisk on the File Name tab in the Editor window indicates that this is a script that can be executed.

Back 30

False.
The asterisk indicates that the file has been changed since it was saved.

Front 31

16. MATLAB echoes comments entered in a script in the Command window.

Back 31

False.
Comments appear only in the text of the script for human understanding of the logic.

Front 32

17. When the name of script is typed in the Command window, it will be saved if necessary before it is executed.

Back 32

False.
Only the F5 hot key saves before executing.

Front 33

1. __________means expressing a quality apart from a particular implementation.

Back 33

Abstraction

Front 34

2. ____________ is a sequence of instructions for solving a
problem.

Back 34

An algorithm

Front 35

3. Without , ____________ a programming solution can be
mathematically proven to be correct.

Back 35

side effects

Front 36

4. Variable names must not begin with ___________.

Back 36

a numeric character

Front 37

5. Armed with both the _________and______________
of a variable, a compiler can do a better job of ensuring that the programmer isn’t misinterpreting data.

Back 37

name;
type

Front 38

6. An instance of a ___________ is ___________ that is usually stored in a variable of that ____________ .

Back 38

class;
object;
class

Front 39

7. You can ___________ in the Command window in a
manner similar to the way you ___________ on a scientific
calculator.

Back 39

perform calculations;
perform calculations

Front 40

8. You _______________ an entry in the Command History
window to _____________ that command.

Back 40

double-click; repeat the execution

Front 41

9. The columns in the Workspace window show the __________ of the variable, its ____________ , and
two indications of its _____________ .

Back 41

name; current value; data type

Front 42

10. You _____________ the name of a file in the Current
Directory window to edit that file.

Back 42

double-click

Front 43

11. A Document window opens automatically when you ___________ a ___________in the Workspace
window.

Back 43

double-click; variable name

Front 44

12. Graphics windows are created ___________ when a ____________ requests a graph.

Back 44

automatically; MATLAB command

Front 45

13. You create comments by putting a __________ in the text file.

Back 45

percent sign (%)

Front 46

14. MATLAB will __________ all text from the comment mark
to __________.

Back 46

ignore; the end of the current line

Front 47

1. A homogeneous collection must consist entirely of numbers.

Back 47

1. False. Homogeneous collections must consist of data of the same type. This could be double, logical, char, or any of the types you saw in this text.

Front 48

2. The function linspace(...) can create only vectors, whereas the functions zeros(...), ones(...), and rand(...) produce either vectors or arrays of any dimension.

Back 48

2. True.

Front 49

3. The length(...) function applied to a column vector gives you the number of rows.

Back 49

3. False.
Because a column vector has more columns than rows, it returns the number of columns.

Front 50

4. You can access any element(s) of an array of any dimension using a single index vector.

Back 50

4. True.
Regrettably, you can. This is the array linearization. Should you use this? No.

Front 51

5. Mathematical or logical operators are allowed only between two arrays of the same shape (rows and columns).

Back 51

5. False.
Either array can be a scalar quantity (a 1 x 1 array).

Front 52

6. You can access data in a vector A with an index vector that is longer than A.

Back 52

6. True,
as long as the indices in the index vector do not exceed the dimensions of A.

Front 53

7. You can access data in a vector A with a logical vector that is longer than A.

Back 53

7. False. The position of the values in the logical index vector correspond to the position of values in the vector being indexed. Longer logical index vectors are reaching beyond the end of the original vector.

Front 54

8. When moving a block of data in the form of specified rows and columns from array A to array B, the shape of the block in A must match the shape of the block in B.

Back 54

8. True.

Front 55

1. Vector elements have two attributes that make them unique: their __________ and their __________.

Back 55

1. numerical value;
position in the vector

Front 56

2. Vectors can be created using the colon operator, for example, B = 1:3:20, where the first number is the __________ , the second number is the __________ , and the third number is the __________ .

Back 56

2. starting value;
increment;
ending value

Front 57

3. When indexing a source vector with a logical vector, the result will contain the __________ of the source vector corresponding in position to the __________ in the logical vector.

Back 57

3. elements;
true values

Front 58

4. The normal precedence of operators can be overruled by the use of __________ .

Back 58

4. parentheses

Front 59

5. Arithmetic operations can be performed collectively on the individual components of two arrays as long as both arrays _________ or one of them is __________ .

Back 59

5. have the same dimensions; a scalar

Front 60

6. To remove elements from arrays, you write __________ in __________.

Back 60

6. the empty vector, [];
complete rows or columns

Front 61

7. Removing rows or columns from an array is _________ ,
and can lead to __________ . Wherever possible, use __________ to __________ .

Back 61

7. bad;
logical difficulties;
indexing;
copy the rows and columns you want to keep

Front 62

1. MATLAB keywords are colored green by the editor.

Back 62

1. False.
Comments are colored green; keywords that control execution are colored blue.

Front 63

2. Indentation is required in MATLAB to define code blocks.

Back 63

2. False.
The MATLAB editor inserts indentation only to clarify for the reader the flow of control in a script.

Front 64

3. It is possible that no code at all is executed by 'if' or 'switch' constructs.

Back 64

3. True.
If the if statement has no else clause, or the switch statement has no otherwise clause and the data provided matches none of the specified cases.

Front 65

4. The word 'true' is a valid logical expression.

Back 65

4. True.

Front 66

5. When evaluating a sequence of logical && expressions, MATLAB will stop processing when it finds the first true result.

Back 66

5. False.
The result that invalidates all other && expressions is false.

Front 67

6. The for loop repeats the enclosed code block a fixed number of times even if you modify the index variable within the code block.

Back 67

6. True.
But you can still use break to exit the loop early.

Front 68

7. Using a break statement is illegal in a while loop.

Back 68

7. False.
But it ought to be. This is really bad programming practice.

Front 69

8. The logical expression used in a while loop specifies the conditions for exiting the loop.

Back 69

8. False.
The expression specifies the reason to stay in the loop.

Front 70

1. MATLAB uses __________ in the text to define the extent
of code blocks.

Back 70

1. key command words

Front 71

2. The function __________ is implicitly called by MATLAB
if you supply a vector of logical values to the if statement.

Back 71

2. all(...)

Front 72

3. It is good practice to include __________ in a switch
statement to trap illegal values entering the switch.

Back 72

3. otherwise

Front 73

4. There is no reason to evaluate any more components of a logical or expression once a __________ result has been found.

Back 73

4. true

Front 74

5. A while loop can be repeated a ___________ number of
times, depending on the ___________ being processed.

Back 74

5. variable;
values of data

Front 75

6. If you are in a __________ loop, you can use the break
statement to skip immediately out of the __________ loop.

Back 75

6. for or while;
innermost containing