R Programming Q&A
getwd() - (correct answer)See the current working directory
setwd() - (correct answer)Move to a different working directory (put a path in the
parentheses)
dir() - (correct answer)List all files in the working directory
<- - (correct answer)The assignment operator will assign a value to a symbol
print() - (correct answer)Explicit printing of what you put in the parentheses. You can
also auto print something by typing it and pressing enter. Note that R will print brackets
around the number of elements in a vector before the elements themselves.
ls() - (correct answer)List all of the objects in the local workspace
list.files() - (correct answer)List all files in the working directory
? - (correct answer)Use this to prompt the help page (e.g., ?list.files will bring up the
help page for the list.files function). Note that symbols must be enclosed in backticks
after the ? (e.g., ?`:`).
args() - (correct answer)Displays the argument names and corresponding default values
of a function or primitive
dir.create() - (correct answer)Create a directory in the current working directory
file.create() - (correct answer)Create a new file in the working directory
, file.exists() - (correct answer)Check to see if a file exists in the working directory
file.info() - (correct answer)Get information about the file
file.rename() - (correct answer)Change the name of a file
file.remove() - (correct answer)Delete a file
file.copy() - (correct answer)Make a copy of a file
file.path() - (correct answer)Create a file path
Create a directory in the current working directory called "testdir2" and a subdirectory
for it called "testdir3" all in one command - (correct answer)dir.create(file.path('testdir2',
'testdir3'), recursive = TRUE)
unlink() - (correct answer)Delete a directory
Delete a directory named "testdir2" - (correct answer)unlink("testdir2", recursive =
TRUE)
Assign the value of the current working directory to a variable called "old.dir" - (correct
answer)old.dir <- dir()
Create a sequence of numbers from 1 through 20 - (correct answer)1:20 or seq(1,20)
This will create 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Create a sequence of numbers from pi to 10 - (correct answer)pi:10
getwd() - (correct answer)See the current working directory
setwd() - (correct answer)Move to a different working directory (put a path in the
parentheses)
dir() - (correct answer)List all files in the working directory
<- - (correct answer)The assignment operator will assign a value to a symbol
print() - (correct answer)Explicit printing of what you put in the parentheses. You can
also auto print something by typing it and pressing enter. Note that R will print brackets
around the number of elements in a vector before the elements themselves.
ls() - (correct answer)List all of the objects in the local workspace
list.files() - (correct answer)List all files in the working directory
? - (correct answer)Use this to prompt the help page (e.g., ?list.files will bring up the
help page for the list.files function). Note that symbols must be enclosed in backticks
after the ? (e.g., ?`:`).
args() - (correct answer)Displays the argument names and corresponding default values
of a function or primitive
dir.create() - (correct answer)Create a directory in the current working directory
file.create() - (correct answer)Create a new file in the working directory
, file.exists() - (correct answer)Check to see if a file exists in the working directory
file.info() - (correct answer)Get information about the file
file.rename() - (correct answer)Change the name of a file
file.remove() - (correct answer)Delete a file
file.copy() - (correct answer)Make a copy of a file
file.path() - (correct answer)Create a file path
Create a directory in the current working directory called "testdir2" and a subdirectory
for it called "testdir3" all in one command - (correct answer)dir.create(file.path('testdir2',
'testdir3'), recursive = TRUE)
unlink() - (correct answer)Delete a directory
Delete a directory named "testdir2" - (correct answer)unlink("testdir2", recursive =
TRUE)
Assign the value of the current working directory to a variable called "old.dir" - (correct
answer)old.dir <- dir()
Create a sequence of numbers from 1 through 20 - (correct answer)1:20 or seq(1,20)
This will create 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Create a sequence of numbers from pi to 10 - (correct answer)pi:10
