What are the very basic data types in R called?
Click to see answer
Vectors.
Click to see question
What are the very basic data types in R called?
Vectors.
What is the most common data structure in R?
Vector.
Where can R be started in Windows?
In 'My Documents' or the user's home directory.
What are reserved words in R programming?
A set of words that have special meaning and cannot be used as identifiers.
What does creating a variable in R do?
It reserves some space in memory.
What is the output of the command ls() after creating objects a, b, c, and sum?
[1] 'a' 'b' 'c' 'sum'
What are the names of the months in R?
January, February, March, April, May, June, July, August, September, October, November, December.
What programming language is R built on top of?
The S programming language.
What does the function length(vector_name) return in R?
The total number of elements in the vector.
How do you execute R language commands in an R session?
By typing them line by line and pressing the enter key.
What is the error message when trying to assign a value to 'TRUE'?
Error in TRUE <- 1: invalid (do_set) left-hand side to assignment.
What is the hexadecimal representation of 255?
0xff.
What does NULL represent in R?
The absence of a value or an undefined value.
What function is used to determine the class of an object in R?
class()
What does Inf represent in R?
Infinity, such as when 1 is divided by 0.
What command can you type to quit R?
'q()'.
Where can R be downloaded from?
The comprehensive R Archive Network (CRAN) at http://cran.r-project.org.
What happens when you run rm(list = ls()) in R?
It removes all objects from the current R environment.
How can R programming experience benefit job applicants?
It can make them stand out from the crowd.
What makes R programming simple to learn?
It allows you to learn as you go with just data and a clear intent to draw conclusions.
How can you transform a vector into a matrix with specific dimensions?
By setting the dimensions using dim() function.
What should you run if you install both R and R Studio?
You need to run R Studio only.
Why is it not good to rely on month names and abbreviations in R?
Because they are implemented as variables whose values can be changed.
What is the output when 'v' is assigned the value 'TRUE'?
[1] "character"
Give examples of valid identifiers in R.
total, Sum, .fine.with.dot, this_is_acceptable, Number5.
Why is data science considered a highly sought-after profession?
It involves using large amounts of data to make better decisions, and R is a key tool for data scientists.
What are some important features of R?
Conditionals, loops, user-defined recursive functions, and effective data handling.
How should multi-line comments be formatted in R?
They should be put inside either single or double quotes.
Can 'True' be used as a variable name in R?
Yes, it can be used as a variable name.
How can you list the names of objects in the current R session?
By using the ls() command.
How is R installed on Windows and Mac?
Just like installing any other program.
What is implicit coercion in R?
The automatic conversion of one data type to another without explicit instruction.
How can you remove a specific object from the current R session?
By using the rm() command with the object's name.
How can character constants be represented in R?
Using either single quotes (') or double quotes ("), e.g., 'example' or "example".
What does NaN stand for in R?
Not a Number, such as when 0 is divided by 0.
What command is used to set the current working directory in R?
setwd()
Is R free software?
Yes, R is freely available under the GNU General Public License.
What is the function to create a matrix in R?
matrix(nrow = x, ncol = y).
How is the string 'Hello' stored in R when converted to raw format?
"Hello" is stored as 48 65 6c 6c 6f
How do you start an R session?
By using the command 'R'.
What are the basic data types in R?
Logical, integer, numeric, complex, and character.
What happens when you coerce an existing numeric vector with as.numeric()?
It does nothing.
What is a popular alternative to R for statistical computing?
Python.
What command is used to create a matrix from a vector in R?
matrix()
What is R Studio?
A free IDE for R available at http://www.rstudio.com.
What are the abbreviations for the months in R?
Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec.
What class does the variable 'v' belong to after assigning it a complex number (2 + 5i)?
[1] "complex"
What languages can R integrate with for efficiency?
C, C++, .Net, Python, or FORTRAN.
How are matrices defined in R?
As a special vector with added dimensions (rows and columns).
Is R case-sensitive?
Yes, R is case-sensitive.
What is the value of pi in R?
3.141593.
What kind of data analysis can be performed in R?
Any type of data analysis.
What file is created if you choose to save the workspace?
.RData is written to the present working directory.
What should you click on the left sidebar to start the R installation?
Click on the CRAN link.
What is the coercion rule order in R?
logical -> integer -> numeric -> complex -> character.
What is R commonly used for?
Implementing machine learning algorithms in various fields like finance, genetics research, retail, marketing, and health care.
What are the two ways to execute R programming?
Typing commands in an R session or saving commands as a script file.
What is the result of 0XF + 1?
What type of programming language is R?
An interpreted computer language that allows branching, looping, and modular programming using functions.
What is the result of coercing a character vector like c('a', 'b', 'c') to numeric?
It does not work and returns NA.
How might programmers from other languages find R initially?
Quirky and confusing due to its different syntax.
Why is the adoption of R by tech giants significant?
It indicates the programming language's potential.
When might R be a better choice than Python?
When analyzing a dataset and presenting findings in a research paper.
What command provides online help in R?
'help()'.
What is a list in R?
A container that can hold different data types and structures.
What is the purpose of the length() function in R?
To determine the number of elements in a vector.
What command provides information about a specific file in R?
file.info('filename')
How does Ford use R?
To analyze social media for design decisions.
What is R's role in statistical computing?
It is the most popular programming language among statisticians, built specifically for them.
What is the preferred practice for naming variables in current versions of R?
Using period (.) as word separators.
How do you create an empty vector in R?
Using vector() function, e.g., x <- vector().
What are the basic types of constants in R?
Numeric constants and character constants.
What is the common source of frustration among beginners in R?
Understanding basic data types and structures.
In what areas has R found significant use?
Predictive analytics and machine learning.
What do you need to select after clicking the CRAN link?
Select a mirror.
What happens to the workspace when R is restarted?
The workspace and all created objects are restored automatically from the '.RData' directory.
Name three reserved words used for conditions and loops in R.
if, else, while.
How are matrices constructed in R?
Matrices are constructed columnwise.
How do you get help on a function in R?
Type help(function-name) in the R prompt.
What is the result of printing the class of an integer vector in R?
[1] "integer"
What is an identifier in R?
A unique name given to a variable, function, or object.
How do you create a logical vector in R?
Using c(TRUE, TRUE, FALSE, FALSE).
What are some frequently used R-Objects?
Vectors, Lists, Matrices, Arrays, Factors, Data Frames.
What makes R different from most other statistical software packages?
R is an object-oriented programming environment.
What is the simplest R-object?
The vector object.
What are the built-in constants for uppercase letters in R?
LETTERS: "A", "B", "C", ..., "Z".
What does the command 'demo()' do in R?
It shows some demos.
What should you click to download the base distribution of R?
Click on the link that downloads the base distribution.
How can you add an element to an existing vector in R?
Using c(z, 'Annette').
What are atomic vectors in R?
Vectors that can be of characters, logical, integers, or numeric.
How does R handle graphical representation?
It provides graphical facilities for data analysis and display.
What is an example of a numeric data type in R?
12.3, 5, 999.
What does Inf represent in R?
Infinity, which can be positive or negative.
What is a downside of SPSS?
It is expensive.
What does the function is.recursive() check in R?
It checks if an object is a recursive list.
What does a numeric constant followed by 'i' signify in R?
It is regarded as complex.
What is the purpose of multi-line comments in R?
To provide explanations without interfering with the actual program.
What command is used to list all objects in the current R environment?
ls()
How are numeric constants interpreted when preceded by 0x or 0X?
They are interpreted as hexadecimal numbers.
What is the latest release version of R mentioned?
R - 3.4.0.
What happens when you type a variable name in an R session?
It prints the value of the variable on the screen.
How can you get the current working directory in R?
By using the getwd() command.
What are variables used for in R?
To store data, whose value can be changed according to our need.
What output is generated when starting an R session?
R version information and copyright details.
What function is used to find the storage mode of an object in R?
storage.mode()
What happens if you choose 'n' when asked to save the workspace image?
All memory of current session commands and variables is lost.
What is the output of typeof("5") in R?
"character".
What type of decisions do companies make based on R?
Decisions backed by concrete analysis of data.
What are the main data structures in R?
Vector, list, matrix, data frame, factors, and tables.
Is R a case-sensitive language?
Yes, TRUE and True are not the same.
How can you change the value of pi in R?
By assigning a new value, e.g., pi <- 56.
How do you write a single-line comment in R?
By starting the line with #.
Why is SPSS considered easy to learn?
It is similar to Excel, making it user-friendly for non-statisticians.
What is an example of an integer data type in R?
2L, 34L, 0L.
How can you check the type of a numeric constant in R?
Using the typeof() function.
What is a significant advantage of R being open source?
R is free to download and can be used in commercial applications without legal issues.
What is the output of typeof(5) in R?
"double".
What is the first step to run R programming on a Windows computer?
Go to the official site of R programming (https://www.r-project.org/).
What does the word 'TRUE' represent in R?
A logical constant.
What is the average salary for data scientists in the US?
$144,000.
What command is used to start an R session?
'R' from the command line.
What function is used to determine the type of an object in R?
typeof()
Who created R?
Ross Ihaka and Robert Gentleman at the University of Auckland, New Zealand.
What types of data can be stored in R variables?
Character, wide character, integer, floating point, double floating point, Boolean, etc.
What type of vectors can you create in R?
Logical vectors, character vectors, numeric vectors, and complex vectors.
How does R handle variable data types compared to languages like C and Java?
In R, variables are not declared with a data type; they are assigned R-Objects, and the data type of the R-object becomes the variable's data type.
What command removes all objects created in the current R session?
rm(list = ls())
What are the rules for writing identifiers in R?
What types of programming constructs does R use instead of traditional loops?
Vectors, lists, frames, data tables, matrices, etc.
What is the workspace in R?
A memory portion where R objects created and loaded are stored.
What is SAS primarily used for?
Analytics needs in private enterprises.
What is the file extension for R scripts?
.R
How can you create a list in R?
Using the list() function or coercing other objects with as.list().
What are R's capabilities in terms of graphics?
R has state-of-the-art graphics capabilities to visualize complex data.
What is an example of a logical data type in R?
TRUE, FALSE.
How can R be integrated with other programming languages?
R functionality can be integrated into applications written in C++, Java, Python, PHP, SAS, and SPSS.
What contribution did Microsoft make to R?
Released Microsoft R Open and Microsoft R Server.
How many packages does R have for statistical functions?
More than 9100 packages.
How do you create a numeric vector in R?
Using c() function, e.g., x <- c(1, 2, 3).
Is R programming easy to learn?
It's a difficult question; many researchers learn it as their first language.
What does a numeric constant followed by 'L' signify in R?
It is regarded as an integer.
What is the syntax for using the help.search function?
??search_term.
What command is used to exit the R session?
Type quit() in the R prompt.
Why is Python favored by data scientists?
It is a powerful high-level, object-oriented programming language with easy-to-use syntax.
What type of programming language is R?
An open source programming language and software environment for statistical computing and graphics.
What function is used to find the length of an object in R?
length()
What function can you use to examine the type of a vector in R?
typeof(z).
How can you list the names of files in the current directory in R?
By using the list.files() command.
What is one application of R at Twitter?
Monitoring user experience.
What makes SAS a good tool for companies?
Its GUI, comprehensive documentation, and reliable technical support.
What kind of tools does R provide for data analysis?
A large, coherent, and integrated collection of tools.
What makes lists fundamentally different from atomic vectors in R?
Lists can contain elements of different classes and even other lists.
Does R support multi-line comments?
No, but you can use a trick to simulate them.
What platforms does R run on?
Windows, Unix, and Mac OS X.
How can lists be useful inside functions in R?
They can combine different types of results into a single object.
What is the purpose of variables in programming?
To store various information.
What is the syntax to use the help function in R?
help(Syntax) or > ?Syntax.
What is the output of typeof(5L) in R?
"integer".
What functions are used to bind columns or rows in R?
cbind() and rbind().
What does NA represent in R?
Not Available, used to represent missing values.
What is the first step to install R on Windows?
Click 'Download R for Windows'.
What are some examples of invalid identifiers in R?
tot@l, 5um, .0ne.
What does dim(m) return for a matrix m?
The dimensions of the matrix (number of rows and columns).
What are the built-in constants for lowercase letters in R?
letters: "a", "b", "c", ..., "z".
What is the typical working directory in Linux for R?
The directory from where R was launched.
What is the value of the built-in constant pi in R?
3.141593.
What does the command 'contributors()' provide?
Information about contributors to R.
Should I install the 32-bit or 64-bit version of R?
Most people don’t need to worry; both versions run seamlessly on 64-bit Windows.
How can you concatenate multiple items in R?
Using the paste() function.
What does NaN mean in R?
Not a number, indicating an undefined value.
What are some attributes that can be part of an object in R?
Names, dimnames, length, and class.
What is the median salary for data scientists according to a 2014 survey?
$98,000 worldwide.
How many data types are there for atomic vectors in R?
Six data types.
What did Harvard Business Review call data scientists?
The 'sexiest job of the 21st century.'
What is the purpose of the 'license()' command in R?
To view distribution details.
What is SPSS commonly used for?
Statistical analysis, especially in the social sciences.
What is the output format of lists when printed in R?
Each element prints on a new line.
What is one way the New York Times uses R?
For infographics and data journalism.
Why is R considered extensible?
R can be expanded by installing additional packages.
What is the fundamental concept about everything in R?
Everything in R is an object.
What was the traditional assignment operator in earlier versions of R?
Underscore (_).
What should you do after downloading the R installation file?
Run the file and follow the steps in the instructions to install R.
What does the seq() function do in R?
Creates a sequence of numbers.
How can you suppress quotes in the output of print()?
By using the argument quote = FALSE.
Why is R considered the #1 choice for data scientists?
Due to its wide usage, effective tools, and support from a vibrant community.
What capabilities does R offer for data visualization?
It allows you to plot data and create interesting visualizations from any dataset.
How can you get help on specific topics in R?
Use the help() function along with the topic you want to search.
What function can be used for a search engine type of search in R?
The help.search() function.
What is the output of typeof(5i) in R?
"complex".
What function is used to print output in R?
The print() function.
Why is it important to understand basic data types in R?
They are manipulated on a day-to-day basis in R.
How many basic atomic classes does R have?
5 basic atomic classes.
When might you consider installing the 32-bit version of R?
If your production environment is 32-bit due to potential compatibility issues.
How do you explicitly create integers in R?
By adding an 'L' at the end, e.g., x1 <- c(1L, 2L, 3L).
How popular is R as a programming language?
R was ranked 5th in popularity among programming languages in 2016, up from 6th in 2015.
What is R commonly used for?
Statistical computing, data analytics, and scientific research.
