Matlab Strings and Text Processing Quiz
40 comprehensive questions on MATLAB's string and text processing capabilities covering string vs char arrays, concatenation, string functions, pattern matching, and text parsing techniques — with 16 code examples to master MATLAB's cpp quiz text manipulation tools.
40 Questions
~80 minutes
1
Question 1
What is the basic difference between char and string in MATLAB?
A
char creates character arrays for traditional text handling, string creates modern string arrays with enhanced functionality and methods
B
They are identical data types
C
string is for numbers, char is for text
D
String type is not supported
2
Question 2
How do you create a character array in MATLAB?
matlab
text = 'Hello World';A
Use single quotes to create character arrays containing text data for traditional string operations
B
Character arrays are created with double quotes
C
Use char() function only
D
Character arrays are not supported
3
Question 3
How do you create a string array in MATLAB?
matlab
text = "Hello World";A
Use double quotes to create modern string arrays with enhanced methods and functionality for text processing
B
String arrays are created with single quotes
C
Use string() function only
D
String arrays are not supported
4
Question 4
How do you concatenate character arrays?
matlab
str1 = 'Hello';
str2 = 'World';
result = [str1, ' ', str2];A
Use square brackets [] to horizontally concatenate character arrays and add spaces or other characters between them
B
Use + operator for char concatenation
C
Use concat() function for characters
D
Character concatenation is not supported
5
Question 5
How do you concatenate string arrays?
matlab
str1 = "Hello";
str2 = "World";
result = str1 + " " + str2;A
Use + operator to concatenate string arrays, providing more intuitive text combination than character arrays
B
Use square brackets [] for string concatenation
C
Use concat() function for strings
D
String concatenation is not supported
6
Question 6
What does the strlength function do?
matlab
text = "Hello World";
len = strlength(text);A
strlength() returns the number of characters in string arrays, handling Unicode characters correctly for accurate length measurement
B
strlength() works with character arrays
C
strlength() counts words
D
String length is not supported
7
Question 7
How do you convert between char and string?
matlab
char_array = 'Hello';
string_array = string(char_array);A
Use string() to convert char to string, char() to convert string to char for interoperability between text data types
B
Conversion is automatic
C
Use convert() function for both directions
D
Type conversion is not supported
8
Question 8
What does the strcmp function do?
matlab
result = strcmp('hello', 'Hello');A
strcmp() compares character arrays for exact equality, returning 1 for match and 0 for difference in text comparison operations
B
strcmp() is case-insensitive
C
strcmp() works with string arrays
D
String comparison is not supported
9
Question 9
How do you perform case-insensitive string comparison?
matlab
result = strcmpi('hello', 'HELLO');A
Use strcmpi() function to compare character arrays ignoring case differences for flexible text matching
B
strcmpi() is case-sensitive
C
Use lower() before strcmp()
D
Case-insensitive comparison is not supported
10
Question 10
What does the strfind function do?
matlab
text = 'Hello World';
positions = strfind(text, 'l');A
strfind() locates all occurrences of substring within character array, returning indices of matches for text searching operations
B
strfind() works with string arrays
C
strfind() finds whole words only
D
Substring finding is not supported
11
Question 11
How do you extract a substring from a character array?
matlab
text = 'Hello World';
substring = text(7:11);A
Use indexing with colon operator to extract portions of character arrays, specifying start and end positions for substring operations
B
Use substr() function for character arrays
C
Use substring() method
D
Substring extraction is not supported
12
Question 12
What does the strrep function do?
matlab
text = 'Hello World';
new_text = strrep(text, 'World', 'MATLAB');A
strrep() replaces all occurrences of substring with new text in character arrays for find-and-replace operations
B
strrep() works with string arrays
C
strrep() replaces single characters only
D
String replacement is not supported
13
Question 13
How do you split a string by delimiters?
matlab
text = 'apple,banana,orange';
fruits = strsplit(text, ',');A
Use strsplit() function to divide character arrays into cell array of substrings based on specified delimiter for text parsing
B
strsplit() works with string arrays
C
Use split() function for character arrays
D
String splitting is not supported
14
Question 14
What does the strtrim function do?
matlab
text = ' Hello World ';
clean_text = strtrim(text);A
strtrim() removes leading and trailing whitespace from character arrays for text cleaning and normalization
B
strtrim() removes all spaces
C
strtrim() works with string arrays
D
Whitespace trimming is not supported
15
Question 15
How do you convert numbers to strings?
matlab
num = 42;
text = num2str(num);A
Use num2str() function to convert numeric values to character arrays for display and concatenation with text
B
Use string() for number conversion
C
Numbers convert automatically to strings
D
Number to string conversion is not supported
16
Question 16
What does the regexp function do?
matlab
text = 'The year is 2023';
matches = regexp(text, '\d+', 'match');A
regexp() uses regular expressions to find patterns in character arrays, enabling sophisticated text matching and extraction operations
B
regexp() is for simple text search
C
regexp() works with string arrays
D
Regular expressions are not supported
17
Question 17
How do you check if a string contains a substring?
A
Use contains() function with string arrays or strfind() with character arrays to check for substring presence in text data
B
Use find() function for substring checking
C
Substring checking is automatic
D
Contains checking is not supported
18
Question 18
What is the difference between upper and lower functions?
A
upper() converts text to uppercase, lower() converts to lowercase for case normalization in text processing operations
B
They are identical functions
C
upper() works with numbers, lower() with text
D
Case conversion is not supported
19
Question 19
How do you join multiple strings with a delimiter?
A
Use strjoin() function to combine cell array of strings with specified delimiter for formatted text output and data export
B
Use join() function for strings
C
Use + operator with delimiter
D
String joining is not supported
20
Question 20
What does the str2num function do?
A
str2num() converts character arrays containing numeric text to actual numbers for data import and user input processing
B
str2num() converts numbers to strings
C
str2num() works with string arrays
D
String to number conversion is not supported
21
Question 21
How do you use regular expressions for pattern replacement?
A
Use regexprep() function to replace text patterns using regular expressions for sophisticated find-and-replace operations in character arrays
B
Use strrep() for regex replacement
C
regexprep() works with string arrays
D
Regex replacement is not supported
22
Question 22
What is the purpose of the deblank function?
A
deblank() removes trailing whitespace from character arrays while preserving leading spaces for specific text formatting needs
B
deblank() removes all whitespace
C
deblank() is identical to strtrim()
D
Deblank function is not supported
23
Question 23
How do you extract numbers from text using regular expressions?
A
Use regexp() with digit pattern '\d+' to find and extract numeric sequences from text for data parsing applications
B
Use str2num() for regex extraction
C
Numbers are extracted automatically
D
Numeric extraction is not supported
24
Question 24
What does the sprintf function do?
A
sprintf() formats mixed data types into character arrays using format specifiers for controlled text output and display formatting
B
sprintf() is for screen output only
C
sprintf() works with string arrays
D
Formatted output is not supported
25
Question 25
How do you handle Unicode characters in MATLAB strings?
A
MATLAB string arrays natively support Unicode characters, while character arrays require careful encoding handling for international text processing
B
Unicode is not supported
C
Use unicode() function for Unicode support
D
Unicode characters are converted automatically
26
Question 26
What is the difference between strfind and regexp?
A
strfind() performs simple substring search, regexp() uses powerful regular expressions for complex pattern matching and text analysis
B
They are identical functions
C
strfind() is for regex, regexp() for simple search
D
Both are for simple text search
27
Question 27
How do you validate email addresses using pattern matching?
A
Use regexp() with email pattern to validate email format, combining username, @ symbol, and domain validation for data integrity checking
B
Use strfind() for email validation
C
Email validation is automatic
D
Email validation is not supported
28
Question 28
What does the textscan function do?
A
textscan() parses formatted text data into cell arrays using format specifiers for structured data import from text files
B
textscan() is for screen output
C
textscan() works with string arrays
D
Text scanning is not supported
29
Question 29
How do you handle variable-length whitespace in text?
A
Use regexp() with whitespace pattern '\s+' to match and handle variable amounts of spaces, tabs, and newlines in text processing
B
Use strtrim() for variable whitespace
C
Variable whitespace is handled automatically
D
Variable whitespace handling is not supported
30
Question 30
What is the purpose of the blanks function?
A
blanks() creates character arrays filled with space characters for padding and alignment operations in text formatting
B
blanks() removes spaces
C
blanks() works with string arrays
D
Space creation is not supported
31
Question 31
How do you extract words from a sentence?
A
Use regexp() with word boundary pattern '\b\w+\b' to extract individual words from text for linguistic processing and analysis
B
Use strsplit() with space delimiter
C
Words are extracted automatically
D
Word extraction is not supported
32
Question 32
What does the compose function do?
A
compose() creates string arrays from format specifiers and data arrays for vectorized text formatting operations
B
compose() is for character arrays
C
compose() creates single strings
D
String composition is not supported
33
Question 33
How do you validate phone numbers using pattern matching?
A
Use regexp() with phone number pattern to validate format, checking digit sequences, parentheses, and hyphens for contact data validation
B
Use strfind() for phone validation
C
Phone validation is automatic
D
Phone validation is not supported
34
Question 34
What is the difference between strsplit and regexp for text parsing?
A
strsplit() uses simple delimiters for basic splitting, regexp() provides powerful pattern-based parsing for complex text segmentation and extraction
B
They are identical functions
C
strsplit() is for regex, regexp() for simple splitting
D
Both are for simple text splitting
35
Question 35
How do you handle escaped characters in regular expressions?
A
Use double backslashes in MATLAB strings to represent single backslashes in regex patterns for proper special character matching
B
Escaped characters are handled automatically
C
Use single backslashes for escaping
D
Escaped character handling is not supported
36
Question 36
What does the count function do with strings?
A
count() counts occurrences of substring patterns in string arrays for text analysis and frequency counting operations
B
count() works with character arrays
C
count() counts characters
D
String counting is not supported
37
Question 37
How do you parse dates from text?
A
Use regexp() to extract date components or datetime() with format specifiers to parse date strings into datetime objects for temporal data processing
B
Use str2num() for date parsing
C
Dates are parsed automatically
D
Date parsing is not supported
38
Question 38
What is the purpose of the reverse function for strings?
A
reverse() reverses character order in string arrays for text manipulation and palindrome checking operations
B
reverse() works with character arrays
C
reverse() reverses word order
D
String reversal is not supported
39
Question 39
How do you handle multiline text in MATLAB?
A
Use sprintf() with newline characters or string arrays for multiline text, with regexp() supporting multiline pattern matching using dotall flag
B
Multiline text is not supported
C
Use multi() function for multiline
D
Multiline handling is automatic
40
Question 40
Considering MATLAB's string processing capabilities as a whole, what fundamental advantage does the dual string system provide compared to languages with only one string type?
A
Dual system offers choice between efficient char arrays for traditional operations and feature-rich string arrays for modern text processing, providing optimal performance for different use cases while maintaining backward compatibility with extensive legacy codebase
B
Faster processing speed
C
Automatic type conversion
D
Simplified syntax