Sakinashaikh at 12:37, 1 June 2020

2020-06-01T12:37:56Z

Sakinashaikh at 12:37, 1 June 2020

2020-06-01T12:37:15Z

Sakinashaikh: Created page with "{| border =1 |'''Time''' |'''Narration''' |- || 00:01 || Welcome to the spoken tutorial on '''Lists and its Operations'''. |- || 00:06 || In this tutorial, we will learn ho..."

2020-06-01T12:36:44Z

Created page with "{| border =1 |'''Time''' |'''Narration''' |- || 00:01 || Welcome to the spoken tutorial on '''Lists and its Operations'''. |- || 00:06 || In this tutorial, we will learn ho..."

New page

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

|-
|| 00:01
|| Welcome to the spoken tutorial on '''Lists and its Operations'''.

|-
|| 00:06
|| In this tutorial, we will learn how to:

|-
|| 00:11
|| Create a '''list''' in '''R'''

|-
|| 00:14
|| Access the elements of a '''list'''

|-
|| 00:18
|| Perform indexing on '''lists'''

|-
|| 00:21
|| Combine two '''lists'''

|-
|| 00:25
|| To understand this tutorial, you should know,

|-
|| 00:28
|| ''Data frames''' in''' R'''

|-
|| 00:31
|| '''Matrices''' and '''vectors''' in''' R'''

|-
|| 00:35
|| If not, please locate the relevant tutorials on '''R''' on this website.

|-
|| 00:42
|| This tutorial is recorded on

|-
|| 00:45
|| '''Ubuntu Linux '''OS version 16.04

|-
|| 00:51
|| '''R '''version 3.4.4

|-
|| 00:55
|| '''RStudio''' version 1.1.456

|-
|| 01:00
|| Install '''R''' version '''3.2.0''' or higher.

|-
||01:06
|| For this tutorial, we will use,

|-
|| 01:10
|| A '''data frame CaptaincyData.csv'''

|-
|| 01:15
|| and A '''script '''file '''myList.R'''.

|-
|| 01:20
|| Please download these files from the '''Code files''' link of this tutorial.

|-
|| 01:26
|| I have downloaded and moved these files to '''Lists''' folder.

|-
|| 01:32
|| This folder is located in '''myProject''' folder on my '''Desktop'''.

|-
|| 01:38
|| I have also set this folder as my '''Working Directory.'''

|-
|| 01:44
|| Let us switch to '''RStudio'''.

|-
|| 01:47
|| Open the '''script myList.R '''in''' RStudio'''.

|-
|| 01:53
|| I am resizing the '''Source''' window

|-
|| 01:58
|| Run this '''script''' by clicking on '''Source''' button.

|-
|| 02:02
|| '''captaincy data frame '''opens in the '''Source''' window.

|-
|| 02:07
|| Now let us create a matrix from a subset of '''captaincy. '''

|-
|| 02:13
|| We will convert the values in first three rows of '''played, won''' and '''lost''' columns into a '''matrix'''.

|-
|| 02:23
|| Click on the '''script myList.R'''

|-
|| 02:27
|| In the '''Source '''window, type the following '''commands'''.

|-
|| 02:31
|| Press '''Enter'''.

|-
||02:33
||Press '''Enter''' at the end of every '''command'''.

|-
|| 02:37
|| Remember, '''as.matrix function''' is used to convert '''subData '''into a '''matrix'''.

|-
|| 02:45
|| Now let us create a numeric '''vector myVector.'''

|-
|| 02:51
|| In the '''Source''' window, type the following '''command'''.

|-
|| 02:54
|| Save the '''script''' and run the last three lines of code by pressing '''Ctrl + Enter''' keys simultaneously.

|-
|| 03:06
|| I am resizing the '''Source''' window

|-
|| 03:10
|| The three objects '''subData, matrixA''' and '''myVector''' are loaded in our '''workspace'''.

|-
|| 03:17
|| We will learn how to create a '''list''' in '''R''' by using the '''list function'''.

|-
|| 03:23
|| A '''list''' is an '''R object'''.

|-
|| 03:27
|| It has components of mixed '''data types''' like

|-
|| 03:33
|| '''strings'''

|-
|| 03:35
|| '''numbers'''

|-
|| 03:37
|| '''vectors'''

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|| 03:38
|| some other '''list''' inside it.

|-
|| 03:41
|| A '''list''' can also contain a '''matrix''' or a '''function''' as its '''elements'''.

|-
|| 03:48
|| A '''vector''' having all '''elements''' of the same '''type''' is called '''atomic vector''',

|-
|| 03:56
|| whereas, A '''vector''' having '''elements''' of different '''types''' is called '''list'''.

|-
|| 04:02
|| Let us switch to '''RStudio'''.

|-
|| 04:05
|| We will create a '''list''' containing '''captaincy, matrixA''' and '''myVector'''.

|-
|| 04:13
|| I am resizing the '''Source''' window

|-
|| 04:18
|| In the '''Source''' window, type the following '''command'''.

|-
|| 04:21
|| Now, we will assign names to the '''elements''' of '''myList'''.

|-
|| 04:27
|| For this, we will use '''names function'''.

|-
|| 04:31
|| In the '''Source''' window, type the following '''command'''.

|-
|| 04:35
|| We will assign the following names,

|-
|| 04:40
|| '''dataframe''' to '''captaincy'''.

|-
|| 04:44
|| '''matrix''' to '''matrixA'''

|-
|| 04:47
|| '''vector''' to '''myVector'''

|-
|| 04:49
|| In the '''Source''' window, now type '''print, myList '''in parentheses.

|-
|| 04:55
|| Run the last three lines of code.

|-
|| 04:59
|| I am resizing the '''Console''' window.

|-
|| 05:03
|| In the '''Console''' window, three '''elements''' of '''myList''' are shown with their respective names.

|-
|| 05:11
|| Hence, '''myList''' is a named '''list'''.

|-
|| 05:15
|| Now, we will learn how to access the '''elements''' of a '''list'''.

|-
|| 05:21
|| I am resizing the '''Console''' window.

|-
|| 05:25
|| '''Elements''' of the '''list''' can be accessed by the '''index''' of the '''elements''' in the '''list'''.

|-
|| 05:32
|| It is also known as '''indexing'''.

|-
|| 05:35
|| In case of named '''lists''', it can also be accessed by using the names.

|-
|| 05:43
|| Suppose we want to access the '''element''' named as '''dataframe''' of '''myList'''.

|-
|| 05:49
|| In the '''Source''' window, type''' myList dollar sign dataframe'''

|-
|| 05:56
|| Run the current line.

|-
|| 05:58
|| '''captaincy dataframe''', which is an '''element''' of '''myList''', is shown on the '''Console'''.

|-
|| 06:04
|| We can also access an '''element''' by using its '''index'''.

|-
|| 06:11
|| Suppose we want to access the '''element''' named '''matrix''' of '''myList'''.

|-
|| 06:17
|| '''Index''' of '''matrix''' is 2 in '''myList'''.

|-
|| 06:21
|| In the '''Source''' window, type '''myList''' and 2 in square brackets.

|-
|| 06:28
|| Run the current line.

|-
|| 06:31
|| '''matrix element''' of '''myList''' is shown on the '''Console'''.

|-
|| 06:36
|| Now, suppose we want to access the third column of '''matrix element''' of '''myList'''.

|-
|| 06:42
|| For this, we use double square brackets.

|-
|| 06:47
|| In the '''Source''' window, type the following '''command'''.

|-
|| 06:51
|| 2 in double square brackets denotes that second '''element''' of '''myList''' is to be accessed.

|-
|| 07:00
|| comma 3 in single square brackets denotes that third column of second '''element''' is to be accessed.

|-
|| 07:08
|| Remember we use single square bracket notation with two '''indices''' for '''indexing''' a '''data frame'''.

|-
|| 07:17
|| First '''index''' and second '''index''' refer to row and column respectively.

|-
|| 07:23
|| Also, leaving an '''index''' blank indicates that we want to keep all the '''elements''' in that dimension.

|-
|| 07:31
|| Run the current line.

|-
|| 07:34
|| The elements of third column of '''matrix element''' are displayed on the '''Console'''.

|-
|| 07:40
|| Now, let us learn how to combine two different '''lists'''.

|-
|| 07:45
|| First, we will create a simple '''list'''.

|-
|| 07:49
|| In the '''Source''' window, type the following '''command'''.

|-
|| 07:53
|| Save the '''script''' and run the current line.

|-
|| 07:57
|| Now, we declare an '''object''' named '''merged dot list.'''

|-
|| 08:03
|| It is used for storing the combined output of '''myList''' and '''listSimple'''.

|-
|| 08:11
|| In the '''Source''' window, type the following '''commands'''.

|-
|| 08:15
|| Save the '''script''' and run the last three lines of code.

|-
|| 08:20
|| I am maximizing the '''Console''' window.

|-
|| 08:24
|| Now, scroll up to locate the output.

|-
|| 08:28
|| The combined '''list''' is shown on the '''Console'''.

|-
|| 08:33
|| Let us summarize what we have learnt.

|-
|| 08:37
|| In this tutorial, we have learned how to

|-
|| 08:41
|| Create a '''list''' in R

|-
|| 08:43
|| Access the '''elements''' of a '''list'''

|-
|| 08:46
|| Perform '''indexing''' on '''lists'''

|-
|| 08:50
|| Combine two '''lists'''

|-
|| 08:53
|| We now suggest an assignment.

|-
|| 08:56
|| Create a numeric '''vector''' c(1:5) and a 5 by 3 '''matrix''' with '''elements''' from 1 to 15.

|-
|| 09:04
|| Create a named '''list''' with '''vector, matrix''' and '''iris data set'''.

|-
|| 09:11
|| Retrieve the '''iris data set''' from the '''list''' using dollar operator and '''indexing''' method.

|-
|| 09:18
|| State the differences between the results obtained by using dollar operator and '''indexing''' method
of accessing '''iris'''.

|-
|| 09:28
|| For solutions, please refer to the '''Additional Material '''section on this website.

|-
|| 09:35
|| The video at the following link summarises the Spoken Tutorial project.

|-
|| 09:41
|| Please download and watch it.

|-
|| 09:44
|| We conduct workshops using Spoken Tutorials and give certificates.

|-
|| 09:49
|| Please contact us.

|-
|| 09:52
|| Please post your timed queries in this forum.

|-
|| 09:57
|| Please post your general queries in this forum.

|-
|| 10:01
|| The '''FOSSEE '''team coordinates the '''TBC '''project.

|-
|| 10:05
|| For more details, please visit these sites.

|-
|| 10:08
|| The Spoken Tutorial project is funded by NMEICT, MHRD, Govt. of India

|-
|| 10:15
|| The script for this tutorial was contributed by Shaik Sameer (FOSSEE Fellow 2018).

|-
|| 10:22
|| This is Sudhakar Kumar from IIT Bombay signing off. Thanks for watching.

|-
|}

@@ Line 33: / Line 33: @@
 |-
 || 00:28
-|| ''Data frames''' in''' R'''
+|| '''Data frames''' in ''' R'''
 |-

@@ Line 452: / Line 452: @@
 |-
 || 09:18
-|| State the differences between the results obtained by using dollar operator and '''indexing''' method
+|| State the differences between the results obtained by using dollar operator and '''indexing''' method of accessing '''iris'''.
-   of accessing '''iris'''.
 |-

R/C2/Lists-and-its-Operations/English-timed - Revision history

Sakinashaikh at 12:37, 1 June 2020

Sakinashaikh at 12:37, 1 June 2020

Sakinashaikh: Created page with "{| border =1 |'''Time''' |'''Narration''' |- || 00:01 || Welcome to the spoken tutorial on '''Lists and its Operations'''. |- || 00:06 || In this tutorial, we will learn ho..."