R Programming Basics: Theory and File Handling

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Questions and Answers

What function in R would you use to combine multiple elements into a vector?

  • `combine()`
  • `vector()`
  • `c()` (correct)
  • `concat()`

How do you read a CSV file into R?

  • `open.csv(file)`
  • `load.csv(file)`
  • `readFile(file)`
  • `read.csv(file)` (correct)

What function is used to install packages in R?

  • `install()`
  • `load.packages()`
  • `library()`
  • `install.packages()` (correct)

Which function in R returns the structure of an object?

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

How do you create a data frame in R?

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

Which command lists all files, including hidden ones, in a directory?

<p><code>ls -al</code> (D)</p> Signup and view all the answers

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

<p><code>chmod</code> (B)</p> Signup and view all the answers

How do you display the contents of a file in Linux?

<p><code>cat</code> (A)</p> Signup and view all the answers

What command is used to find patterns in files?

<p><code>grep</code> (D)</p> Signup and view all the answers

How do you check the current directory you are in?

<p><code>pwd</code> (A)</p> Signup and view all the answers

What command do you use to initialize a new Git repository?

<p><code>git init</code> (D)</p> Signup and view all the answers

How do you clone a repository from GitHub?

<p><code>git clone url</code> (B)</p> Signup and view all the answers

What command stages changes for the next commit?

<p><code>git add</code> (C)</p> Signup and view all the answers

How do you view the commit history in Git?

<p><code>git log</code> (C)</p> Signup and view all the answers

Which command creates a new branch in Git?

<p><code>git branch new_branch</code> (A)</p> Signup and view all the answers

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Study Notes

Basic R Programming

  • The c() function is used to combine multiple elements into a vector.
  • 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 is used to return the structure of an object.
  • The data.frame() function is used to create a data frame in R.

Linux

  • The ls -al command is used to list 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 you are in.

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 is used to stage changes for the next commit.
  • The git log command is used to view the commit history in Git.
  • The git branch new_branch command is used to create a new branch in Git.

Simple Code Debugging

  • The provided R code snippet is missing the assignment of data to the data variable, which is required to calculate the mean of a vector.

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