Sandhya.np14 at 12:23, 12 June 2019

2019-06-12T12:23:16Z

PoojaMoolya at 05:22, 11 June 2019

2019-06-11T05:22:03Z

PoojaMoolya: Created page with " {| border=1 | '''Time''' | '''Narration''' |- | 00:01 | Hello Friends. Welcome to the spoken tutorial on "'''Multiple plots'''". |- |..."

2019-05-29T12:59:11Z

Created page with " {| border=1 | <center>'''Time'''</center> | <center>'''Narration'''</center> |- | 00:01 | Hello Friends. Welcome to the spoken tutorial on "'''Multiple plots'''". |- |..."

New page

{| border=1
| <center>'''Time'''</center>
| <center>'''Narration'''</center>

|-
| 00:01
| Hello Friends. Welcome to the spoken tutorial on "'''Multiple plots'''".

|-
| 00:07
| At the end of this tutorial, you will be able to,

Draw multiple '''plots''' which are '''overlaid'''.

|-
| 00:15
| Use the '''figure command'''.

|-
| 00:17
| Use the '''legend command'''.

|-
| 00:20
| Switch between the '''plots''' and perform some '''operations''' on each of them like saving the '''plots'''.

|-
| 00:28
| To record this tutorial, I am using '''Ubuntu Linux 14.04''' operating system

|-
| 00:36
| '''Python 3.4.3'''

'''IPython 5.1.0'''

|-
| 00:42
| To practise this tutorial, you should know how to use '''Plots''' interactively

|-
| 00:49
| Embellish a '''plot'''

Save''' plots'''

|-
| 00:53
| If not, see the pre-requisite '''Python '''tutorials on this website.

|-
| 00:59
| Let us first open the '''Terminal '''by pressing '''Ctrl+Alt+T '''keys simultaneously.

|-
| 01:07
| Now, type '''ipython3''' and press '''Enter'''.

|-
| 01:13
| Let us initialise the '''pylab package'''.

Type '''percentage pylab '''and press''' Enter.'''

|-
| 01:21
| Let us create set of '''points''' for our '''plot '''by using the '''command linspace'''

|-
| 01:29
| Type '''x equals to linspace''' inside the '''brackets 0 comma 50 comma 10'''

|-
| 01:39
| Now let us draw a simple '''sine curve''' using these '''points.'''

Type '''plot''' inside the '''brackets x comma sin(x)'''

|-
| 01:51
| As we can see, this '''sine curve''' is not a '''smooth curve. ''' What really caused this?

|-
| 01:59
| This happened because we selected few '''points''' that is 10 for this large '''interval''' of 0 to 50.

|-
| 02:08
| '''Plot function''' does not '''plot''' the '''analytical function.'''

|-
| 02:12
| It plots the '''points''' given by the '''analytical function'''.

|-
| 02:17
| Now, let us use '''linspace command''' to get 500 points between 0 and 50 and draw the '''sine curve''' again.

|-
| 02:29
| Type '''y equals to linspace''' inside the '''brackets 0 comma 50 comma 500.'''

|-
| 02:39
| '''plot''' inside the '''brackets y comma sin(y)'''

|-
| 02:45
| Now we see a '''sine curve''' with a '''smooth curve'''.

|-
| 02:50
| Notice we will also have two '''plots''' one '''overlaid''' upon another.

|-
| 02:56
| In '''pylab''', by default all the '''plots''' are '''overlaid'''.

|-
| 03:01
| To '''distinguish''' between two '''overlaid plots''' we use the '''legend command.'''

|-
| 03:07
| Type '''legend''' inside the '''brackets square brackets sin(x) comma sin(y).'''

|-
| 03:16
| The '''legend command''' takes '''parameter '''as a '''list''' of '''strings.'''

|-
| 03:21
| Then it assigns '''strings''' to''' plots''' in the order they were created.

|-
| 03:27
| Now we can see the '''legends''' being '''displayed''' for the '''two sine curves '''on the '''plot area'''.

|-
| 03:34
| In the '''IPython terminal''' now type '''clf()''' to clear the '''plot''' window.

|-
| 03:41
| Pause the video. Try this exercise and then resume the video.

|-
| 03:46
| Draw two '''plots''' first '''plot''' being a '''parabola''' of the form '''y equals to 4x square'''

|-
| 03:56
| and the second being a '''straight line''' of the form '''y equals to 2x plus 3''' in the '''interval''' '''minus '''5 to 5.

|-
| 04:05
| Use '''legends''' to indicate what each '''plot''' is doing.

|-
| 04:11
| Switch to the terminal for solution.

Type '''x is equal to linspace''' inside the '''brackets minus 5 comma 5 comma 100'''

|-
| 04:25
| We can obtain the two '''plots''' in different '''colours''' using the following '''commands'''.

|-
| 04:31
| '''plot''' inside the '''brackets x comma 4 multiplied by''' inside the '''brackets x multiplied by x. '''

|-
| 04:42
| '''plot''' inside the '''brackets x comma 2 multiplied by x plus 3'''

|-
| 04:50
| Now, we will add a '''legend''' to identify the '''plots'''.

|-
| 04:55
| Type '''legend''' inside the '''brackets''' inside '''square brackets r''' inside '''inverted commas dollar y is equal to 4 x square dollar comma r''' inside '''inverted commas dollar y equals to 2x plus 3 dollar. '''
|-
| 05:19
| We can see the '''legend''' added to the '''plot'''.

|-
| 05:24
| Next we will learn to '''switch''' between the '''plots''' and perform '''operations''' such as saving the '''plots''' etc.

|-
| 05:33
| Let us see how to accomplish this. But before we move on, let us clear our screen.

Type '''clf()'''

|-
| 05:43
| Type '''x equals to linspace''' inside the '''brackets 0 comma 50 comma 500 '''

|-
| 05:53
| To accomplish more control over '''individual plots''' we use the '''figure command '''

Type

'''figure(1)'''

|-
| 06:03
| '''plot''' inside the '''brackets x comma sin(x) comma inside inverted commas b'''

|-
| 06:12
| '''figure(2)'''

|-
| 06:14
| '''plot''' inside the '''brackets x comma cos(x) comma inside inverted commas g'''

|-
| 06:24
| Now we have two''' plots''', a '''sine curve '''and a '''cosine curve''' in two different '''figures'''.

|-
| 06:33
| The '''figure command''' takes an '''integer''' as an '''argument. '''

This is''' '''the '''serial number''' of the '''plot''' to select corresponding '''plot'''.

|-
| 06:43
| All the''' plot commands '''we run hereafter are applied to the selected '''plot'''.

In this '''example, figure''' 1 is the '''sine plot''' and '''figure''' 2 is the '''cosine''' '''plot'''.

|-
| 06:56
| For example, we can '''save''' each''' plot '''separately.

|-
| 07:01
| Type '''title''' inside '''brackets''' inside '''inverted commas cos(x)'''

|-
| 07:09
| '''savefig''' inside the '''brackets''' inside '''inverted commas cosine.png'''

|-
| 07:18
| '''figure(1)'''

|-
| 07:21
| '''title''' inside the '''brackets''' inside '''inverted commas sin(x)'''

|-
| 07:28
|'''savefig''' inside the '''brackets''' inside '''inverted commas sine.png'''

|-
| 07:36
| The figures will be saved in current working directory.

Now close both the '''plot''' windows.

|-
| 07:44
| Pause the video.Try this exercise and then resume the video.

|-
| 07:49
| Draw a line of the form '''y equals to x''' as one '''figure''' and another line of the form '''y is equal to 2x plus 3'''.

Save each of them.

|-
| 08:05
| Switch to the '''terminal''' for solution.

To solve this problem we will use the '''figure command''' to create first '''plotting area'''

|-
| 08:15
|Type

'''figure(1) '''

'''x equals to linspace''' inside the '''brackets minus 5 comma 5 comma 100'''

|-
| 08:29
|'''plot''' inside the '''brackets x comma x'''

|-
| 08:35
| Now use the '''figure command''' to create second '''plotting area''' and '''plot '''the''' figure'''

|-
| 08:43
|Type

'''figure(2) '''

'''plot''' inside the '''brackets x comma 2x plus 3'''

|-
|08:56
| We will save the '''figure''' as follows.

|-
| 08:59
|Type

'''figure(1)'''

'''savefig''' inside '''brackets''' inside '''inverted commas plot1.png '''

|-
| 09:11
|'''figure(2)'''

'''savefig''' inside '''brackets''' inside '''inverted commas plot2.png'''

|-
| 09:23
| This brings us to the end of this tutorial. In this tutorial, we have learnt to,

Draw '''multiple plots''' which are '''overlaid'''.

|-
| 09:33
| Use the '''figure command'''.

|-
| 09:35
|Use the '''legend command. '''

|-
| 09:38
| Switch between the '''plots''' and perform some '''operations''' on each of them like saving the '''plots'''.

|-
| 09:46
| Here are some self assessment questions for you to solve

What '''command''' is used to get individual '''plots''' separately?

|-
| 09:55
| What will be the '''command''' to identify '''sine''' and '''cosine curve'''?

|-
| 10:00
| And the answers,

The '''command "figure()"''' can get us the individual '''plots''' separately.

|-
| 10:07
|The legend command '''legend''' inside the '''brackets''' inside '''square brackets''' inside '''inverted commas sin(x) comma inside inverted commas cos(x)'''

|-
| 10:21
| Please post your timed queries in this forum.

|-
|10:26
| Please post your general queries on Python in this forum.

|-
| 10:31
| FOSSEE team coordinates the TBC project.

|-
| 10:35
| Spoken-tutorial is funded by NMEICT, MHRD, Govt. of India.

For more details, visit this website.

|-
| 10:45
| This is Usha from IIT Bombay signing off. Thank You

|}

@@ Line 120: / Line 120: @@
 |-
 | 03:01
-| To '''distinguish''' between two '''overlaid plots''' we use the '''legend command.'''
+| To distinguish between two '''overlaid plots''' we use the '''legend command.'''
 |-
@@ Line 235: / Line 235: @@
 | All the''' plot commands '''we run hereafter are applied to the selected '''plot'''.
-In this '''example, figure''' 1 is the '''sine plot''' and '''figure''' 2 is the '''cosine''' '''plot'''.
+In this example, '''figure''' 1 is the '''sine plot''' and '''figure''' 2 is the '''cosine''' '''plot'''.
 |-

Python-3.4.3/C2/Multiple-plots/English-timed - Revision history

Sandhya.np14 at 12:23, 12 June 2019

PoojaMoolya at 05:22, 11 June 2019

PoojaMoolya: Created page with " {| border=1 | '''Time''' | '''Narration''' |- | 00:01 | Hello Friends. Welcome to the spoken tutorial on "'''Multiple plots'''". |- |..."