Sandhya.np14 at 08:06, 12 June 2019

2019-06-12T08:06:51Z

PoojaMoolya at 05:21, 11 June 2019

2019-06-11T05:21:09Z

PoojaMoolya: Created page with "{| border=1 |'''Time''' |'''Narration''' |- |00:01 |Hello Friends. Welcome to the tutorial on "'''Embellishing a Plot'''". |- |00:06 |..."

2019-05-29T12:57:22Z

Created page with "{| border=1 |<center>'''Time'''</center> |<center>'''Narration'''</center> |- |00:01 |Hello Friends. Welcome to the tutorial on "'''Embellishing a Plot'''". |- |00:06 |..."

New page

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

|-
|00:01
|Hello Friends. Welcome to the tutorial on "'''Embellishing a Plot'''".

|-
|00:06
|At the end of this tutorial, we will learn to- Modify the attributes of the '''plot''' '''color''', '''line style''', '''linewidth'''.

|-
|00:16
| Add a title to the '''plot''' with '''embedded LaTeX'''.

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|00:20
| Label '''x '''and '''y axes'''. Add annotations to the '''plot'''.

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|00:26
| Set and get the '''limits '''of '''axes'''.

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|00:30
|To record this tutorial, I am using '''Ubuntu Linux 14.04''' operating system

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|00:37
| '''Python 3.4.3''' , '''IPython 5.1.0'''

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|00:43
|To practice this tutorial, you should know how to run basic '''Python '''commands on the '''ipython console''' and use the '''Plots''' interactively'''.'''

|-
|00:54
|If not, see the pre-requisite '''Python '''tutorials on this website.

|-
|00:59
|Let us start '''ipython3'''.

Open the '''terminal.'''

|-
|01:05
|Type '''ipython3 '''and press '''Enter.'''

|-
|01:11
|Let us initialise the '''pylab package'''

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|01:15
|Type '''percentage pylab '''and press''' Enter.'''

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|01:21
|We shall first make a simple '''plot''' and start '''modifying''' it.

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|01:26
|Type '''x = linspace''' inside the '''brackets minus 2 comma 4 comma 20 '''and press '''Enter.'''

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|01:40
|Then type '''plot''' inside the '''brackets x comma sin(x) '''and press '''Enter.'''

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|01:49
|We can now see the '''sine curve '''in the '''plot '''window.

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|01:53
|The default colour and thickness of the line is as decided by '''pylab'''.

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| 01:59
|Let us now change the '''parameters''' of this '''curve'''.

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|02:03
|We can pass additional '''arguments '''to the '''plot command '''to do this.

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|02:09
|We shall first clear the '''plot '''window by typing '''clf() '''in the '''ipython console.'''

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|02:16
|You can now see a blank '''plot window'''.

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|02:20
|Now '''plot''' the same '''sine curve '''with an additional '''color argument'''.

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|02:26
| So we will type '''plot''' inside the '''brackets x comma sin(x) comma''' inside '''inverted commas r '''and press '''Enter.'''

Here, the '''argument 'r' '''is for red color.

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|02:44
|On the '''plot window''', the same '''sine curve '''is now seen in red color.

|-
|02:50
|Do not close the '''plot''' '''window''' just minimize it.

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|02:54
|We can alter the thickness of the line by using the ''''linewidth' argument'''.

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|03:00
|This time we will draw the '''cosine curve '''on the '''plot '''window.

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|03:05
|So, type '''plot''' inside '''brackets x comma cos(x) comma linewidth is equals to 2 '''and press '''Enter.'''

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|03:18
|A '''cosine curve '''with line thickness 2 is produced in the '''plot '''window.

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| 03:24
|Let us now try to plot a '''sine curve '''in blue color with '''linewidth '''as 3.

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| 03:31
|Here onwards, press the '''Enter''' the key to execute every command that we type on the '''Ipython console'''.

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|03:39
|Let us clear the '''plot '''window by typing '''clf(). '''

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|03:44
|You will again see a blank plot window.

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|03:48
|Now type''' plot''' inside the '''brackets x comma sin(x) comma''' inside '''inverted commas b comma linewidth is equal to 3'''

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|04:03
| A combination of '''color''' and '''linewidth''' would do the job for us.

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|04:08
|To get the '''plot '''in dotted style instead of a solid style, put a '''dot''' in '''linestyle.'''

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|04:16
|First, type '''clf() '''to clear the '''plot '''window.

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| 04:20
|Now type '''plot''' inside the '''brackets x comma sin(x) comma''' inside '''inverted commas dot.'''

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|04:32
|We get the '''sine curve '''in dotted style.

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|04:36
|Let's see the information of '''plot'''.

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|04:40
|Type '''plot question mark '''and press '''Enter'''

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|04:47
|Pause the video. Try this exercise and then resume the video .

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|04:52
|'''Plot''' the '''curve''' of '''x verses cos(x)''' in red '''dash line''' and '''linewidth''' 3.

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| 05:00
|Let us switch to the '''console '''for the solution.

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|05:04
|Type '''clf() '''to clear the '''plot '''window.

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|05:08
|Now type '''plot''' inisde '''brackets x comma cos(x) comma''' inside '''inverted commas r hyphen hyphen comma linewidth equals to 3'''

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|05:25
|We use a combination of '''linewidth argument''' and '''linestyle'''.

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| 05:30
|Now we know how to produce a '''bare minimum plot''' with '''color, style''' and '''thickness'''.

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|05:38
| Let us look at modifying the '''plot '''further.

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|05:42
|Let us start with a '''plot''' for the '''function minus x square plus 4x minus 5. '''

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|05:51
| Now type '''plot''' inside the '''brackets x comma minus x multiplied by x plus 4 multiplied by x minus 5 comma''' inside '''inverted commas r comma linewidth is equal to 2'''

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|06:16
|We will see the curve of this equation in the '''plot '''window.

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|06:21
|But the figure does not have any description describing the '''plot'''.

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|06:26
|To add a title to the '''plot''', use the '''title command'''.

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|06:31
| So type '''title''' inside the '''brackets''' inside '''inverted commas Parabolic function minus x square plus 4x minus 5'''

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|06:48
|The '''title command''' as you can see, takes a '''string''' as an '''argument.'''

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|06:54
|We can see the''' title''' on the '''plot''' window. But it is not '''formatted''' and does not look clean.

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|07:03
|It would look even more shabby if there were '''fractions''' and '''complex''' '''functions'''.

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|07:09
| Let us write the''' title '''in''' LaTeX''' format for a neater look.

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|07:14
|For '''LaTeX''' format, we put a '''dollar sign '''before and after the '''string'''.

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|07:20
|Type '''title''' inside the '''brackets r''' inside '''inverted commas Parabolic function dollar minus x square plus 4x minus 5 dollar'''

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|07:38
|Here '''' r '''' means that the '''string''' is to be treated as a '''raw string'''.

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|07:45
|It will ignore all '''escape codes'''.

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|07:49
|As we can see that the '''polynomial''' in the '''title '''is now '''formatted'''.

|-
|07:55
|Although we have '''title''', the '''plot''' is not complete without labelling the '''x '''and '''y axes'''.

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|08:03
|So we will '''label x''' and '''y axes''' in '''LaTeX style'''.

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|08:09
|Type '''xlabel''' inside the '''brackets r''' inside '''inverted commas dollar x dollar '''and''' ylabel''' inside '''brackets r''' inside '''inverted commas dollar y dollar '''

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|08:30
|The '''plot '''is now almost complete.

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|08:34
|Now we will name the '''points''' considering '''point(2 comma minus 1)''' as '''local maxima'''.

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|08:42
| To name a '''point,''' we use the '''function annotate'''.

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|08:46
|Type '''annotate''' inside the '''brackets''' inside '''inverted commas local maxima comma xy equals to''' inside '''brackets 2 comma minus 1'''

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|09:03
|We can see the '''local maxima''' at point ''' 2 comma minus 1'''

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|09:09
|The first '''argument''' in '''annotate command''' is the name of the point.

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|09:15
| The second '''argument''' represents the '''coordinates '''of the '''point'''.

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|09:20
|It is a '''tuple''' containing two numbers. The first is '''x coordinate''' and second is '''y coordinate'''.

|-
|09:29
|Next, type '''xlim brackets'''

'''xlim function '''returns the current '''x axis limits.'''

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|09:39
|Then type '''ylim brackets''' '''ylim function''' returns the current '''y-axis limits'''.

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| 09:49
| Set the '''limits of x-axis''' from '''minus''' 4 to 5 by typing '''xlim inside the brackets minus 4 comma 5'''

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|10:02
|Similarly, set the '''limits of y-axis''' in a similar manner.

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|10:07
|Type '''ylim''' inside the '''brackets minus 15 comma 2.'''

|-
| 10:19
| Pause the video. Try this exercise and then resume the video.

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|10:24
| Make an '''annotation''' called "'''root'''" at the '''point (minus 4 comma 0)'''.

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|10:31
|What happens to the first '''annotation'''?

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|10:35
|Switch to the '''Ipython console '''for the solution.

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|10:39
|Type '''annotate''' inside the '''brackets''' inside '''inverted commas root comma xy is equal to ''' minus 4 comma 0'''

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|10:53
|Every '''annotate command''' makes a new '''annotation''' on the figure.

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|10:59
|This brings us to the end of this '''tutorial'''. In this '''tutorial''', we have learnt to,

Modify the '''attributes''' of a '''plot''' like '''color, line width, line style''' by passing additional '''arguments'''.

|-
|11:16
| Add '''title '''to a '''plot''' using ''''title command'''.

|-
|11:20
| Incorporate '''LaTeX style formatting''' by adding a $ sign before and after the '''string'''.

|-
|11:28
| Label '''x''' and '''y axes''' using '''xlabel()''' and '''ylabel() commands'''.

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|11:34
| Add '''annotations''' to a plot using '''annotate() command'''.

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|11:39
| Get and set the '''limits of axes''' using '''xlim()''' and '''ylim() commands. '''

|-
|11:46
|Here are some self assessment questions for you to solve.

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|11:51
| Draw a '''plot''' of '''cosine graph''' between '''minus''' '''2pi to 2pi''' with line thickness 4.

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|12:00
| Read the documentation and find out, is there a way to modify the '''alignment''' of text in the '''command ylabel'''.

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|12:09
|And the answers are, In order to '''plot''' a '''cosine graph''' between the points '''minus '''2pi and 2pi with line thickness 4, we use the '''linspace''' and''' plot''' '''command '''as,

'''x equals to linspace inside the brackets minus 2pi comma 2pi.'''

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|12:31
|'''plot (x comma cos(x) comma linewidth equals to 4)'''

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|12:38
|The answer to the second question is: No. We do not have an option to modify the '''alignment '''of text in the '''command''' '''ylabel'''.

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|12:48
|Do you have questions on THIS '''Spoken Tutorial?'''

|-
|12:51
|Choose the minute and second where you have the question.

|-
|12:55
|Explain your question briefly.

Someone from the '''FOSSEE''' team will answer them. Please visit this site.

|-
|13:03
|Do you have any general / technical questions on Python?

|-
|13:08
| Please visit the FOSSEE forum and post your question.

|-
|13:12
|The '''FOSSEE '''team coordinates coding of solved examples of popular books.

|-
|13:18
|We give honorarium and certificates for those who do this.

For more details, please visit this website.

|-
|13:27
|The Spoken Tutorial project is funded by NMEICT, MHRD, Govt. of India

|-
|13:34
|This is Usha from IIT Bombay signing off. Thanks for watching

|}

@@ Line 201: / Line 201: @@
 |-
 | 05:30
-|Now we know how to produce a '''bare minimum plot''' with '''color, style''' and '''thickness'''.
+|Now we know how to produce a bare minimum plot with '''color, style''' and '''thickness'''.
 |-

Python-3.4.3/C2/Embellishing-a-plot/English-timed - Revision history

Sandhya.np14 at 08:06, 12 June 2019

PoojaMoolya at 05:21, 11 June 2019

PoojaMoolya: Created page with "{| border=1 |'''Time''' |'''Narration''' |- |00:01 |Hello Friends. Welcome to the tutorial on "'''Embellishing a Plot'''". |- |00:06 |..."