R/C2/Introduction-to-RStudio/English-timed
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| Time | Narration |
| 00:01 | Welcome to this tutorial on Introduction to R Studio. |
| 00:06 | In this tutorial, you will learn about these features of Rstudio: |
| 00:13 | Source and Console windows |
| 00:15 | Workspace; Plots and Files window |
| 00:21 | How to install packages of R |
| 00:24 | To understand this tutorial, you should know: |
| 00:28 | Elementary Maths |
| 00:32 | Basic commands of R |
| 00:36 | If not, please locate the relevant tutorials on R on this website. |
| 00:41 | This tutorial is recorded on |
| 00:44 | Ubuntu Linux Operating System 16.04 |
| 00:49 | R version 3.2.3 |
| 00:52 | RStudio version 1.1.456 |
| 00:58 | Install R version 3.2.0 or higher. |
| 01:04 | Let us switch to Rstudio. |
| 01:08 | The window in the top left corner is the Source window. |
| 01:14 | It is used to edit a script and run it. |
| 01:17 | The window in the bottom left corner is the Console window. |
| 01:23 | It is used to install packages or to run a particular command. |
| 01:28 | The upper right window is the Workspace window. |
| 01:32 | It stores all the variables used during execution of commands under the Environment tab. |
| 01:40 | Place your cursor on the inside edges of all the windows. |
| 01:46 | A four-headed arrow symbol appears. |
| 01:50 | You can drag this to resize your windows for better visibility. |
| 01:56 | Let us declare some variables. |
| 01:59 | In the Console, type testSample (capital S) space less than symbol followed by hyphen space c. |
| 02:11 | Now, in parentheses, type 1 comma 2 comma 3 comma 4. |
| 02:18 | Press Enter to execute this line. |
| 02:21 | You can see the variable testSample in the Environment window. |
| 02:28 | The lower right window is the Plots and Files window. |
| 02:33 | The Files tab is used to keep track of Working Directories. |
| 02:38 | We will learn more about Working Directory later in this series. |
| 02:43 | The Plots tab shows all the graphical output. |
| 02:46 | Let us plot the variable testSample. |
| 02:50 | In the Console, type plot testSample capital S in parentheses. Press Enter. |
| 02:59 | You can now see the plot in the Plots window. |
| 03:04 | Let us look at the Environment window in the upper right corner. |
| 03:09 | We will clear this variable in this window. |
| 03:12 | At the top of the Environment window, click on the broom icon. |
| 03:18 | A Confirm Remove Objects window appears. |
| 03:22 | Ensure that the box Include hidden objects is checked and click on Yes. |
| 03:30 | Now, there is no variable in the Environment. |
| 03:33 | Click in the Plots window and click on the broom icon. |
| 03:39 | A Clear Plots text box appears. |
| 03:44 | The text reads, “Are you sure you want to clear all of the plots in the history?” |
| 03:50 | Click Yes. |
| 03:52 | Now, let us try plotting this variable again. |
| 03:56 | In the Console, again type plot testSample in parentheses as before. |
| 04:04 | Press Enter. |
| 04:06 | No plot is generated. |
| 04:08 | Instead, we see: |
| 04:10 | Error in plot(testSample) : object 'testSample' not found |
| 04:16 | It means that the variable testSample has been removed from our Workspace. |
| 04:22 | So, you should be careful with this broom icon in the Environment window. |
| 04:27 | Next to Environment, the History tab stores all our actions. |
| 04:34 | Here, we can see the lines that have been executed so far. |
| 04:40 | Let us declare two variables, firstVar and secondVar, which will be used later. |
| 04:47 | In the Console, type first capital V a r space less than symbol followed by hyphen space 6. |
| 05:00 | Press Enter. |
| 05:02 | Next, type second capital V a r space less than symbol followed by hyphen space 8. Press Enter. |
| 05:14 | Our Console window is filled with the previous commands. |
| 05:18 | We need to clean the Console before moving on. |
| 05:23 | Click in the Console window and press Ctrl+L together. |
| 05:28 | Clicking on the broom icon in the upper right corner of the Console will also clear it. |
| 05:35 | To see this icon, place the cursor under the maximizer button of the Console window. |
| 05:42 | You will see a hand symbol and the text, Clear Console Ctrl+L. |
| 05:48 | Packages in R |
| 05:50 | R packages are a collection of R functions, compiled code and sample data. |
| 05:57 | Stored under a directory called library in the R environment. |
| 06:01 | By default, R installs a set of packages |
| 06:07 | Let us switch back to RStudio. |
| 06:10 | Now click on the Environment tab again. |
| 06:14 | To see the list of R packages installed in your system, in the Console, type library parentheses. |
| 06:22 | Press Enter. |
| 06:24 | A tab named R packages available opens up in Source window. |
| 06:30 | Let us install a new package named MASS. |
| 06:34 | Please make sure that you are connected to the Internet. |
| 06:39 | In the Console window, type install dot packages. |
| 06:44 | Now, MASS inside double quotes in parentheses. |
| 06:50 | Press Enter. |
| 06:54 | We will need to wait until R installs the package. |
| 06:59 | There is another way to install a package. Let us install another package named ggplot2. |
| 07:07 | In the top menu bar of RStudio, click on the Tools button. |
| 07:16 | From the drop-down menu, select the Install Packages option. |
| 07:21 | In the Packages field, type the name of the package ggplot2 |
| 07:28 | Ensure that Install dependencies box is checked and click on the Install button. |
| 07:37 | To load a package, we use library function and provide the package name as an argument. |
| 07:46 | We will load the MASS package now. |
| 07:49 | In the Console window, type library MASS in parentheses and press Enter. |
| 07:57 | Now we will use fractions function available in the MASS package. |
| 08:04 | In the Console window, type f r a c t. |
| 08:10 | RStudio shows the fractions option. |
| 08:14 | Press Enter to select it. |
| 08:17 | You can use this feature while typing commands. |
| 08:21 | Only remember that R is case-sensitive. |
| 08:24 | After fractions, type, in parentheses, firstVar division slash secondVar. |
| 08:34 | Press Enter. |
| 08:36 | You can see the reduced fraction ¾ in the Console. |
| 08:41 | In the Console, we can also type firstVar division slash secondVar. |
| 08:48 | It gives the result in decimal form. |
| 08:52 | This brings us to the end of this tutorial. Let us summarize. |
| 08:58 | We have learnt about, Source and Console windows. Source and Console windows |
| 09:02 | Workspace; Plots and Files window |
| 09:04 | How to install packages of R |
| 09:08 | The video at the following link summarises the Spoken Tutorial project. |
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| 10:15 | This is Vidhya Iyer from IIT Bombay signing off. Thanks for watching. |
