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Questions and Answers
What function in R is used to combine multiple elements into a vector?
What function in R is used to combine multiple elements into a vector?
How do you read a CSV file into R?
How do you read a CSV file into R?
What function is used to install packages in R?
What function is used to install packages in R?
Which function in R returns the structure of an object?
Which function in R returns the structure of an object?
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How do you check the type of a variable in R?
How do you check the type of a variable in R?
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How do you clone a repository from GitHub?
How do you clone a repository from GitHub?
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What command stages changes for the next commit in Git?
What command stages changes for the next commit in Git?
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What command creates a new branch in Git?
What command creates a new branch in Git?
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Which command undoes the last commit while keeping the changes in the working directory?
Which command undoes the last commit while keeping the changes in the working directory?
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What is the purpose of the ps command in Linux?
What is the purpose of the ps command in Linux?
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Study Notes
R Programming
- The
c()function is used to combine multiple elements into a vector. - The
seq()function creates a sequence of numbers. - The
read.csv()function is used to read a CSV file into R. - The
install.packages()function is used to install packages in R. - The
str()function returns the structure of an object. - The
data.frame()function is used to create a data frame in R. - The
mean(x, na.rm=TRUE)function calculates the mean ofxignoringNAvalues. - The
class()function is used to check the type of a variable in R. - The
rbind()function is used to combine data frames by rows. - The
rm()function is used to remove a variable from the workspace in R.
Linux
- The
ls -alcommand lists all files, including hidden ones, in a directory. - The
chmodcommand is used to change the permissions of a file. - The
catcommand is used to display the contents of a file. - The
grepcommand is used to find patterns in files. - The
pwdcommand is used to check the current directory you are in. - The
mvcommand is used to move or rename a file. - The
mkdircommand is used to create a new directory in Linux. - The
mancommand is used to find the manual page for a specific command in Linux. - The
pscommand is used to list all processes currently running.
Git
- The
git initcommand is used to initialize a new Git repository. - The
git clone urlcommand is used to clone a repository from GitHub. - The
git addcommand stages changes for the next commit. - The
git logcommand is used to view the commit history in Git. - The
git branch new_branchcommand creates a new branch in Git. - The
git pullcommand fetches and merges changes from the remote repository to the local repository. - The
git rmcommand permanently deletes a file from the Git repository and the filesystem. - The
git diffcommand is used to see the differences between the working directory and the staging area in Git. - The
git reset --soft HEAD~1command undoes the last commit while keeping the changes in the working directory. - The
git tagcommand is used to create a tag in Git.
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Description
Test your knowledge of basic R programming concepts, including functions for combining elements and creating sequences, and reading CSV files.
