R/C2/Introduction-to-R-script/English-timed
From Script | Spoken-Tutorial
| Time | Narration |
| 00:01 | Welcome to this tutorial on Introduction to R script. |
| 00:06 | In this tutorial, you will learn |
| 00:09 | How to work with an R script in RStudio |
| 00:14 | To understand this tutorial, you should know basic commands of R. |
| 00:21 | If not, please locate the relevant tutorials on R on this website. |
| 00:28 | This tutorial is recorded on |
| 00:32 | Ubuntu Linux OS 16.04 |
| 00:37 | R version 3.2.3 |
| 00:42 | RStudio version 1.1.456 |
| 00:48 | Install R version 3.2.0 or higher. |
| 00:54 | An R script is a plain text file in which you save your R code |
| 00:01 | Script allows you to show your work to others, and also reproduce and modify the results |
| 01:10 | Before you begin please create a folder named myProject on Desktop. |
| 01:17 | I have already created this folder on my Desktop. |
| 01:23 | I shall now save all my scripts and data sets in this folder. |
| 01:30 | Later, I shall set this folder as my Working Directory. |
| 01:37 | Let us switch to RStudio. |
| 01:40 | We will close these two tabs named Untitled1 and R packages available. |
| 01:49 | Click on the small cross symbol next to these tabs |
| 01:55 | We will now create a new R script. |
| 01:59 | In the top left corner of RStudio, click on the green plus sign. |
| 02:05 | Now from the dropdown menu, select R Script. |
| 02:11 | A new R script appears in the Source window. |
| 02:17 | You can also create a new R script by pressing Ctrl+Shift+N together. |
| 02:24 | Let us save this R script first. |
| 02:28 | In the top left corner of the screen, click on the File option. |
| 02:36 | Then click on Save to save the script. |
| 02:40 | Select the directory where you want to save your R script. |
| 02:46 | I am saving the script in the folder myProject on my Desktop, with the name myfirstscript. |
| 02:56 | Finally, click on the Save button. |
| 03:01 | Now you can see that the file is named as myfirstscript.R. |
| 03:07 | RStudio automatically adds dot R at the end of the filename. |
| 03:15 | Now, let us write some lines of code in the script file myfirstscript.R. |
| 03:23 | We will create a vector named testSample with one two three four as its elements. |
| 03:33 | We have already learned how to create vectors earlier in this series. |
| 03:39 | In the Source window, type testSample space less than symbol.
Now type hyphen space c 1 comma 2 comma 3 comma 4 in parentheses. Press Enter |
| 03:59 | You may also use equal sign in place of less than symbol followed by hyphen. |
| 04:08 | In the Source window, to the left of the checkbox Source on Save, click on the Save icon Or, press Ctrl+S together to save the file. |
| 04:22 | We will now use the print function to display the values in testSample vector. |
| 04:30 | In the Source window, type p r i |
| 04:35 | RStudio automatically starts suggesting different functions. |
| 04:41 | You can navigate this list of functions by using the up (↑) and down (↓) arrow keys on the keyboard. |
| 04:50 | To select a particular function, just press Enter. |
| 04:56 | Finish typing print testSample in parentheses and press Enter. |
| 05:04 | Now let’s save the file and run it with these two lines only. |
| 05:11 | Now, we maximize the Source window. |
| 05:15 | In the top right corner of the Source window, click on the Source button. |
| 05:22 | You can see the line-by-line execution of the script in the Console. |
| 05:29 | You can also run the script by pressing Ctrl+Shift+Enter together. |
| 05:36 | For this, you need to first click in the script window. |
| 05:42 | Now let’s declare a variable firstVar with value of ten in the Source window. |
| 05:50 | Type firstVar with capital V space equal sign space 10 and press Enter. |
| 06:00 | Please note that R language is case-sensitive. |
| 06:05 | We will now use the print function to show the value of firstVar. |
| 06:11 | In the Source window, type print. |
| 06:16 | I am typing only p r i n but the options appear and I select print from there. |
| 06:28 | Now in parentheses, start typing firstVar. |
| 06:32 | RStudio shows firstVar; press Enter to select it. |
| 06:39 | Press Enter to go to the next line. |
| 06:43 | Now let’s declare another variable secondVar with value of fifteen. |
| 06:50 | In the Source window, type secondVar space equal sign space 15 and press Enter. |
| 07:01 | Now, as shown before, type print secondVar in parentheses to show its value and press Enter |
| 07:13 | We can add comments to our code by using # hash symbol followed by our comment. |
| 07:22 | Type hash symbol space Creating an R script before the declaration of testSample vector. |
| 07:32 | R interprets each line of code. |
| 07:36 | Please make sure that your comment and the first line of code appear in separate lines. |
| 07:46 | Now, let’s comment the line print(secondVar). |
| 07:50 | To do that, first click on this line. |
| 07:56 | Then from the top menu bar of RStudio, click on the Code option. |
| 08:04 | From the dropdown menu, click on the Comment/Uncomment Lines option. |
| 08:10 | This option helps us to comment as well as uncomment a line. |
| 08:17 | On doing so, we see a hash symbol with space. |
| 08:24 | For now, we will uncomment print(secondVar) and save our script. |
| 08:30 | Delete # hash symbol at the beginning of this line. |
| 08:35 | Now let’s run the script file. |
| 08:38 | In the top right corner of the Source window, click on the Source button. |
| 08:45 | Now maximize the Console. |
| 08:50 | The line-by-line execution of the script is shown in the Console window. |
| 08:56 | The sample vector [1 2 3 4] is printed. |
| 09:02 | The values of two variables, 10 and 15 are printed. |
| 09:08 | We will clear the Console by clicking on the broom icon. |
| 09:15 | Now, we minimize the Console window. |
| 09:19 | Now let’s move ahead. |
| 09:23 | Suppose, we want to run only a block of code after print(testSample) from the file myfirstscript.R. |
| 09:34 | First, select or highlight the block of code, starting from firstVar equals 10 to the end. |
| 09:44 | Then in the top right corner of the Source window, click on the Run button with an arrow. |
| 09:53 | Now you can see the output of only the highlighted part of the code in the Console window. |
| 10:00 | The output shows the values of two variables, 10 and 15 only. |
| 10:07 | You can also run a particular block by highlighting it and pressing Ctrl+Enter together. |
| 10:16 | We will clear the Console window by clicking on the broom icon. |
| 10:23 | Now let us create another R script. |
| 10:28 | Use Ctrl+Shift+N to open a new script. |
| 10:33 | Save this script in the same folder myProject with the name mysecondscript. |
| 10:43 | Now let’s learn how to load myfirstscript.R into mysecondscript.R. |
| 10:53 | Go to myfirstscript.R and run it by clicking on the Source button. |
| 11:02 | In the Console window, scroll up to locate the source for this script. |
| 11:09 | Copy it without the symbol. |
| 11:14 | Now let’s get back to our new script mysecondscript.R |
| 11:20 | Paste what we have just copied, at the top of the script mysecondscript.R |
| 11:29 | We can press Enter after comma for better visibility. |
| 11:35 | Next, write one more line to ensure that the execution is from this script only. |
| 11:43 | In the Source window, type print and then the following words in parentheses. |
| 11:51 | In double quotes, Script space loaded. |
| 11:56 | Press Enter. |
| 11:58 | Save the script. |
| 12:01 | Let us clear the Console again by clicking on the broom icon. |
| 12:09 | Now run the script by pressing Ctrl+Shift+Enter together. |
| 12:16 | Maximize the Console window. |
| 12:20 | You can see the output in the Console window and verify the results. |
| 12:27 | Now, we minimize the Console window. |
| 12:30 | This brings us to the end of this tutorial. Let us summarize. |
| 12:37 | We have learned |
| 12:39 | How to create, save and run an R script |
| 12:44 | We now suggest an assignment. |
| 12:47 | Create a script and save it on Desktop as testscript.R |
| 12:54 | Load myfirstscript.R in this script and run it. |
| 13:00 | The video at the following link summarises the Spoken Tutorial project.
Please download and watch it. |
| 13:10 | We conduct workshops using Spoken Tutorials and give certificates.
Please contact us. |
| 13:18 | Do you have questions in THIS Spoken Tutorial? |
| 13:18 | Choose the minute and second where you have the question. Explain your question briefly. |
| 13:31 | Someone from the FOSSEE team will answer them. Please visit this site. |
| 13:37 | Do you have any general / technical questions? Please visit the forum given in the link. |
| 13:45 | The FOSSEE team coordinates coding of solved examples of popular books. We give honorarium and certificates to those who do this. For more details, please visit these sites. |
| 14:00 | The Spoken Tutorial project is funded by MHRD, Govt. of India |
| 14:08 | The script for this tutorial was contributed by Shaik Sameer (FOSSEE Fellow 2018).
This is Sudhakar Kumar from IIT Bombay signing off. Thanks for watching. |
