Sakinashaikh at 15:14, 1 June 2020

2020-06-01T15:14:10Z

Sakinashaikh at 15:13, 1 June 2020

2020-06-01T15:13:48Z

Sakinashaikh at 15:13, 1 June 2020

2020-06-01T15:13:29Z

Sakinashaikh at 15:13, 1 June 2020

2020-06-01T15:13:09Z

Sakinashaikh at 15:12, 1 June 2020

2020-06-01T15:12:55Z

Sakinashaikh at 15:12, 1 June 2020

2020-06-01T15:12:37Z

Sakinashaikh at 15:12, 1 June 2020

2020-06-01T15:12:09Z

Sakinashaikh at 15:09, 1 June 2020

2020-06-01T15:09:17Z

Sakinashaikh: Created page with " {| border =1 |'''Time''' |'''Narration''' |- || 00:01 || Welcome to this tutorial on '''Conditional Statements'''. |- || 00:05 || In this tutorial, we will learn about,..."

2020-06-01T15:08:27Z

Created page with " {| border =1 |'''Time''' |'''Narration''' |- || 00:01 || Welcome to this tutorial on '''Conditional Statements'''. |- || 00:05 || In this tutorial, we will learn about,..."

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{| border =1
|'''Time'''
|'''Narration'''

|-
|| 00:01
|| Welcome to this tutorial on '''Conditional Statements'''.

|-
|| 00:05
|| In this tutorial, we will learn about,

|-
|| 00:08
|| '''Conditional statements'''

|-
|| 00:12
|| '''if, else, '''and '''else if statements'''

|-
|| 00:16
|| To understand this tutorial, you should know,

|-
|| 00:21
|| Basic '''data structures'''

|-
|| 00:23
|| '''Indexing''' and '''slicing data frames'''

|-
|| 00:27
|| If not, please locate the relevant tutorials on '''R''' on this website.

|-
|| 00:35
|| This tutorial is recorded on

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|| 00:37
|| '''Ubuntu Linux '''OS version 16.04

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|| 00:42
|| '''R''' version 3.4.4

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|| 00:46
|| '''RStudio''' version 1.1.463

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|| 00:51
|| Install '''R''' version 3.2.0 or higher.

|-
|| 00:57
|| For this tutorial, we will use

|-
|| 01:00
|| A '''data frame moviesData.csv'''

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|| 01:05
|| A '''script''' file '''conditionalStats.R'''.

|-
|| 01:10
|| Please download these files from the '''Code files''' link of this tutorial.

|-
|| 01:17
|| I have downloaded and moved these files to '''conditionalStatements''' folder.

|-
|| 01:23
|| This folder is located in '''myProject''' folder on my '''Desktop'''.

|-
|| 01:30
|| I have also set '''conditionalStatements''' folder as my '''Working Directory.'''

|-
|| 01:36
|| '''Conditional statements''' are used to execute some logical '''conditions''' in the code.

|-
|| 01:43
|| '''if, else '''and '''else if '''are the basic '''conditional statements'''.

|-
|| 01:49
|| Let us switch to '''RStudio'''.

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|| 01:53
|| Open the '''script conditionalStats.R '''in''' RStudio'''.

|-
|| 02:01
|| Here, we have declared a '''vector inScore'''.

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|| 02:05
|| The elements of this '''vector''' represent the runs scored by '''India''' in three different one-day matches.

|-
|| 02:14
|| Similarly, we have declared another '''vector ausScore'''.

|-
|| 02:20
|| The elements of this '''vector''' represent the runs scored by '''Australia''' in three different one-day matches.

|-
|| 02:29
|| '''Run''' this '''script''' by clicking on the '''Source''' button.

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|| 02:34
|| '''movies data frame''' opens in the '''Source''' window.

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|| 02:39
|| This '''data frame''' will be used later in this tutorial.

|-
|| 02:45
|| Click on the '''script conditionalStats.R'''

|-
|| 02:49
|| Let us now find which country has won the first one day match.

|-
|| 02:55
|| In the '''Source''' window, type the following '''command'''.

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|| 03:00
|| It means that if the '''condition '''is '''TRUE '''then execute the '''expression''' inside the curly brackets.

|-
|| 03:09
|| Save the '''script''' and '''run''' the current line by pressing '''Ctrl+Enter''' keys simultaneously.

|-
|| 03:19
|| I will resize the '''Console''' window.

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|| 03:23
|| As '''India''' scored more runs than '''Australia''' in the first one day match, the message, '''India won the first ODI!, ''' is displayed.

|-
|| 03:35
|| Let us now find which country won the second one day match.

|-
|| 03:41
|| I will resize the '''Console''' window.

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|| 03:45
|| In the '''Source''' window, type the following '''command'''.

|-
|| 03:51
|| Save the '''script''' and '''run''' the current line.

|-
|| 03:55
|| As Australia scored more runs than India in the second one day match, we should get a message, '''Australia won the second ODI!.'''

|-
|| 04:07
|| But no message is displayed on the '''Console.'''

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|| 04:12
|| Here the '''if statement''' will be executed only when '''India''' scores more runs than '''Australia''' in the second one day match.

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|| 04:24
|| Hence, we need to add an '''else statement''' with another expression.

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|| 04:30
|| This expression should be executed when the '''if condition''' is not satisfied.

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|| 04:37
|| Click on the last line of the '''if statement'''.

|-
|| 04:43
|| Now, type the following '''command'''.

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|| 04:47
|| Please note that the '''else statement''' begins on the same line where '''if statement''' ends.

|-
|| 04:57
|| Save the '''script''' and '''run''' the current line.

|-
|| 05:01
|| I will resize the '''Console''' window.

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|| 05:06
|| Now, we get a message, '''Australia won the second ODI!'''

|-
|| 05:11
|| There is another efficient way to write this '''if-else statement'''.

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|| 05:19
|| In the '''Source''' window, type the following '''command'''.

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|| 05:24
|| Here, we are using '''ifelse''' for comparing the elements of two different '''vectors'''.

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|| 05:32
|| Here the '''ifelse statement''' has three '''arguments'''.

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|| 05:38
|| '''test''' - It is an object which can be forced to a logical mode.

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|| 05:43
|| Here '''test '''is for the comparison of scores.

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|| 05:49
|| '''yes''' - It returns values for true elements of the '''test.'''

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|| 05:54
|| Here, the first '''statement''' represents the value of the true element.

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|| 06:01
|| '''no''' - It returns values for false elements of the '''test'''

|-
|| 06:06
|| The second '''statement''' represents the value of the false element.

|-
|| 06:13
|| Save the '''script''' and '''run''' the current line.

|-
|| 06:17
|| We get the same message, '''Australia won the second ODI!'''

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|| 06:23
|| In the '''Source''' window, scroll up to locate the two '''vectors'''.

|-
|| 06:29
|| In the third one day match, '''India''' and '''Australia''' have scored the same number of runs.

|-
|| 06:36
|| Let us use an '''ifelse''' logic to find out the winner in this case.

|-
|| 06:43
|| In the '''Source''' window, click on the next line after the '''ifelse statement'''.

|-
|| 06:51
|| Now type the following '''command'''.

|-
|| 06:56
|| Save the '''script''' and '''run''' the current line.

|-
|| 07:00
|| We get the message, '''Australia won the third ODI! ''' This is not correct.

|-
|| 07:08
|| So, we need to modify our logic.

|-
|| 07:11
|| In the '''Source''' window, type the following '''command'''.

|-
|| 07:16
|| Please note that '''else if statement''' begins on the same line where '''if statement''' ends.

|-
|| 07:25
|| '''Run''' the current line.

|-
|| 07:27
|| I will resize the '''Console''' window.

|-
|| 07:32
|| Now, we got the correct message, '''Third ODI was a tie. '''

|-
|| 07:37
|| I will resize the '''Console''' window again.

|-
|| 07:41
|| A '''conditional structure''' contains only one '''if statement'''.

07:47 It may contain as many '''else if statements''' as you need

07:53 and only one '''else statement'''.

07:57 The '''else statement''' will be executed only when all the above '''if '''and '''else if statements''' are '''FALSE'''.

|-
|| 08:07
|| In the '''Source''' window, scroll up.

|-
|| 08:11
|| Here, we have used '''ifelse''' for comparing the elements of two different '''vectors'''.

|-
|| 08:19
|| Now, we will learn how to use '''ifelse statements''' for comparing the two columns of a '''data frame'''.

|-
|| 08:28
|| In the '''Source''' window, scroll down to locate the last '''ifelse statement'''.

|-
|| 08:35
|| In the '''Source''' window, click on '''movies data frame. '''

|-
|| 08:40
|| In the '''Source''' window, scroll from left to right.

|-
|| 08:45
|| This will enable us to see the remaining objects of '''movies data frame'''.

|-
|| 08:51
|| Let us compare the '''critics_score '''and '''audience_score'''.

|-
|| 08:58
|| We will add a new column named '''dev''' in the '''movies data frame''', which will show
1, if '''audience_score '''is greater than '''critics_score''' and 0, otherwise.

|-
|| 09:15
|| Click on the '''script conditionalStats.R'''

|-
|| 09:20
|| In the '''Source''' window, type the following '''command'''.

|-
|| 09:25
|| Save the '''script''' and '''run''' the last two lines.

|-
|| 09:31
|| '''movies data frame''' opens in the '''Source''' window.

|-
|| 09:36
|| In the '''Source''' window, scroll from left to right.

|-
|| 09:41
|| A new column named '''dev''' has been added. It has 1 or 0.

|-
|| 09:51
|| Remember, 1 means '''audience_score''' is greater than '''critics_score'''.

|-
|| 09:57
|| Now, we will find the number of movies, in which '''audience_score '''is greater than
'''critics_score'''.

|-
|| 10:06
|| For this, we will use the '''sum function''' along with the '''if condition'''.

|-
|| 10:13
|| Click on the '''script conditionalStats.R'''

|-
|| 10:18
|| In the '''Source''' window, type the following '''command'''.

|-
|| 10:24
|| Save the '''script''' and '''run''' the current line.

|-
|| 10:28
|| So, there are 312 movies, in which '''audience_score '''is greater than '''critics_score'''.

|-
|| 10:37
|| Let us summarize what we have learnt.

|-
|| 10:41
|| In this tutorial, we have learnt about, '''Conditional statements''', '''if, else, '''and '''else if
statements'''

|-
|| 10:50
|| We now suggest an assignment.

|-
|| 10:53
|| Use the '''built-in data set iris'''.

|-
|| 10:57
|| Find the species, in which '''Sepal.Length''' is greater than '''Petal.Length''' Count all such species.

|-
|| 11:07
|| The video at the following link summarises the Spoken Tutorial project.

|-
|| 11:13
|| Please download and watch it.

|-
|| 11:16
|| We conduct workshops using Spoken Tutorials and give certificates.

|-
|| 11:22
|| Please contact us.

|-
|| 11:25
|| Please post your timed queries in this forum.

|-
|| 11:30
|| Please post your general queries in this forum.

|-
|| 11:34
|| The '''FOSSEE '''team coordinates the '''TBC '''project.

|-
|| 11:39
|| For more details, please visit these sites.

|-
|| 11:44
|| The Spoken Tutorial project is funded by NMEICT, MHRD, Govt. of India

|-
|| 11:50
|| The script for this tutorial was contributed by Varshit Dubey (College of Engineering Pune).

|-
|| 11:58
|| This is Sudhakar Kumar from IIT Bombay signing off.

|-
|| 12:03
|| Thanks for watching.

|-
|}

@@ Line 360: / Line 360: @@
 || 08:40
 || In the '''Source''' window, scroll from left to right.
 |-

@@ Line 304: / Line 304: @@
 || 07:16
 || Please note that '''else if statement''' begins on the same line where '''if statement''' ends.
 |-

@@ Line 252: / Line 252: @@
 || 06:01
 ||  '''no''' - It returns values for false elements of the '''test'''
 |-

@@ Line 200: / Line 200: @@
 || 04:43
 || Now, type the following '''command'''.
 |-

@@ Line 152: / Line 152: @@
 || 03:19
 || I will resize the '''Console''' window.
 |-

@@ Line 437: / Line 437: @@
 |-
 || 10:41
-|| In this tutorial, we have learnt about, '''Conditional statements''', '''if, else, '''and '''else if
+|| In this tutorial, we have learnt about, '''Conditional statements''', '''if, else, '''and '''else if statements'''
-   statements'''
 |-

@@ Line 330: / Line 330: @@
 || A '''conditional structure''' contains only one '''if statement'''.
-:47 It may contain as many '''else if statements''' as you need
+|-
-:53 and only one '''else statement'''.
+|-
-:57 The '''else statement''' will be executed only when all the above '''if '''and '''else if statements''' are '''FALSE'''.
+|-
 |-
@@ Line 403: / Line 409: @@
 |-
 || 09:57
-|| Now, we will find the number of movies, in which '''audience_score '''is greater than
+|| Now, we will find the number of movies, in which '''audience_score '''is greater than '''critics_score'''.
-   '''critics_score'''.
 |-
 || 10:06
 || For this, we will use the '''sum function''' along with the '''if condition'''.
 |-

@@ Line 371: / Line 371: @@
 |-
 || 08:58
-|| We will add a new column named '''dev''' in the '''movies data frame''', which will show
+|| We will add a new column named '''dev''' in the '''movies data frame''', which will show  1, if '''audience_score '''is greater than '''critics_score''' and 0, otherwise.
-, if '''audience_score '''is greater than '''critics_score''' and 0, otherwise.
 |-

R/C2/Conditional-Statements/English-timed - Revision history

Sakinashaikh at 15:14, 1 June 2020

Sakinashaikh at 15:13, 1 June 2020

Sakinashaikh at 15:13, 1 June 2020

Sakinashaikh at 15:13, 1 June 2020

Sakinashaikh at 15:12, 1 June 2020

Sakinashaikh at 15:12, 1 June 2020

Sakinashaikh at 15:12, 1 June 2020

Sakinashaikh at 15:09, 1 June 2020

Sakinashaikh: Created page with " {| border =1 |'''Time''' |'''Narration''' |- || 00:01 || Welcome to this tutorial on '''Conditional Statements'''. |- || 00:05 || In this tutorial, we will learn about,..."