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Basic R Programming
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Basic R Programming

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Questions and Answers

What is the purpose of the ps command in a Linux system?

  • To list all files in a directory.
  • To print the system's path.
  • To display system information.
  • To list all processes currently running. (correct)

    • What command is used to initialize a new Git repository?

  • git create
  • git new
  • git start
  • git init (correct)

    • What is the command to clone a repository from GitHub?

  • git copy url
  • git fetch url
  • git pull url
  • git clone url (correct)

    • What command stages changes for the next commit in Git?

    <p>git add</p> Signup and view all the answers

    How do you view the commit history in Git?

    <p>git log</p> Signup and view all the answers

    What command creates a new branch in Git?

    <p>git branch new_branch</p> Signup and view all the answers

    What is the purpose of the git pull command?

    <p>To fetch and merge changes from the remote repository to the local repository.</p> Signup and view all the answers

    How do you permanently delete a file from the Git repository and the filesystem?

    <p>git rm</p> Signup and view all the answers

    What is the primary function of the c() function in R?

    <p>To combine multiple elements into a vector</p> Signup and view all the answers

    Which R function is used to create a sequence of numbers from 1 to 10?

    <p>seq(1, 10)</p> Signup and view all the answers

    How do you read a CSV file named 'data.csv' into R?

    <p>read.csv('data.csv')</p> Signup and view all the answers

    What is the purpose of the install.packages() function in R?

    <p>To install a package</p> Signup and view all the answers

    Which function is used to display the structure of an object in R?

    <p>str()</p> Signup and view all the answers

    How do you create a data frame in R?

    <p>data.frame()</p> Signup and view all the answers

    What does the mean(x, na.rm=TRUE) function do in R?

    <p>Calculates the mean of <code>x</code> ignoring <code>NA</code> values</p> Signup and view all the answers

    Which function is used to combine data frames by rows in R?

    <p>rbind()</p> Signup and view all the answers

    What is the command to delete a variable in Linux?

    <p>rm(var)</p> Signup and view all the answers

    Which command is used to display the contents of a file in Linux?

    <p>cat</p> Signup and view all the answers

    What is the command to change the permissions of a file in Linux?

    <p>chmod</p> Signup and view all the answers

    How do you check the current directory you are in in Linux?

    <p>pwd</p> Signup and view all the answers

    What command is used to move or rename a file in Linux?

    <p>mv</p> Signup and view all the answers

    How do you create a new directory in Linux?

    <p>mkdir</p> Signup and view all the answers

    What is the purpose of the ps command in Linux?

    <p>To list all processes currently running.</p> Signup and view all the answers

    What is the command to find patterns in files in Linux?

    <p>grep</p> Signup and view all the answers

    Study Notes

    Basic 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 of x ignoring NA values.
    • 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 -al command lists all files, including hidden ones, in a directory.
    • The chmod command is used to change the permissions of a file.
    • The cat command is used to display the contents of a file.
    • The grep command is used to find patterns in files.
    • The pwd command is used to check the current directory.
    • The mv command is used to move or rename a file.
    • The mkdir command is used to create a new directory.
    • The chmod 755 command sets the file's permissions to read, write, and execute for the owner, and read and execute for others.
    • The man command is used to find the manual page for a specific command.
    • The ps command is used to list all processes currently running.

    Git

    • The git init command is used to initialize a new Git repository.
    • The git clone url command is used to clone a repository from GitHub.
    • The git add command stages changes for the next commit.
    • The git log command is used to view the commit history in Git.
    • The git branch new_branch command creates a new branch in Git.
    • The git pull command fetches and merges changes from the remote repository to the local repository.
    • The git rm command is used to permanently delete a file from the Git repository and the filesystem.
    • The git diff command is used to see the differences between the working directory and the staging area in Git.

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    Related Documents

    Comprehensive Multiple Choice Quiz.pdf

    Description

    Test your knowledge of basic R programming functions such as combining elements, creating sequences, reading CSV files, installing packages, and more. Learn R programming concepts for data analysis.

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