Difference between revisions of "Python/C2/Saving-plots/English-timed"

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{| border=1
 
{| border=1
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!Timing
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|'''Time'''
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!Narration
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|'''Narration'''
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|-
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| 0:00
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| Hello and welcome to the tutorial on "Saving plots".
+
  
 
|-
 
|-
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| 0:04
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| 00:00
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| At the end of this tutorial, you will be able to,
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| Hello and welcome to the tutorial on '''"Saving plots"'''.
  
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# Save plots using <tt>savefig()</tt> function.
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|-
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# Save plots in different formats.
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| 00:04
 +
| At the end of this tutorial, you will be able to-
 +
'''Save''' plots using '''savefig()''' function.
 +
Save '''plot'''s in different formats.
  
 
|-
 
|-
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| 0:13
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| 00:13
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| Before beginning this tutorial,we would suggest you to complete the tutorial on "Using plot interactively".
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| Before beginning this tutorial, we would suggest you to complete the tutorial on '''"Using plot interactively"'''.
  
 
|-
 
|-
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|0:19
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|00:19
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|Now, <nowiki>Start your IPython interpreter with the command ipython hyphen pylab <Pause></nowiki>
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|Now, start your '''IPython interpreter''' with the command '''ipython hyphen pylab'''.
  
 
|-
 
|-
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|0:30
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|00:30
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|As you know, it will start your IPython interpreter with the required python modules for plotting and saving your plots.
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|As you know, it will start your IPython interpreter with the required '''python module'''s for plotting and saving your plots.
  
 
|-
 
|-
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| 0:36
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| 00:36
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| To start with, let us plot a sine wave from minus 3 pi to 3 pi.
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| To start with, let us plot a '''sine wave''' from '''minus 3 pi to 3 pi'''.
  
 
|-
 
|-
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| 0:43
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| 00:43
 
| Let us start by calculating the required points for the plot.
 
| Let us start by calculating the required points for the plot.
  
 
|-
 
|-
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| 0:45
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| 00:45
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| It can be done using linspace as,
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| It can be done using '''linspace''' as-
  
 
|-
 
|-
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|0:51
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|00:51
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|Type x = linspace within brackets minus 3 into pi comma 3 into pi comma 100  
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|You can type: '''x = linspace''' within brackets '''minus 3 into pi comma 3 into pi comma 100'''.
  
 
|-
 
|-
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|  0:59
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|  00:59
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| We have stored the required points in x.  
+
| We have stored the required points in 'x'.  
  
 
|-
 
|-
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|1:03
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|01:03
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|Now let us plot the points using the plot statement.
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|Now, let us plot the points using the ''''plot' statement'''. So, type: '''plot (x, sinx)'''. 
  
 
|-
 
|-
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|  1:18
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|  01:18
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| Done!
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| Done! we have made a very basic '''sine plot'''. Now, let us see how to '''save''' the plot for future use so that you can embed the plot in your '''report'''s.
  
 
|-
 
|-
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| 1:19
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| 01:32
−
| we have made a very basic sine plot, now let us see how to save the plot for future use so that you can embed the plot in your reports.
+
| So, saving the plot, we will use '''savefig()''' function.  
  
 
|-
 
|-
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| 1:32
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|01:36
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| For saving the plot, we will use <tt>savefig()</tt> function.  
+
|For this, we shall keep the '''plot window''' open alongside the '''terminal'''.
  
 
|-
 
|-
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|1:36
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|01:40
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|For this we shall keep the plot window open alongside the terminal.
+
| The statement is: '''savefig''' within brackets in single quotes '''slash home slash fossee slash sine dot png'''.
  
 
|-
 
|-
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|1:40
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| 01:52
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| The statement is,savefig within brackets in single quotes slash home slash fossee slash sine dot png
+
| Notice that '''savefig()''' function takes one '''argument''' which is the filename. The last 3 characters after the '.' in the filename, is the extension and type of the file which determines the format in which you want to '''save'''.
  
 
|-
 
|-
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| 1:52
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| 02:10
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| Notice that <tt>savefig</tt> function takes one argument which is the filename, the last 3 characters after the <tt>.</tt> in the filename is the extension and type of the file which determines the format in which you want to save.
+
| Also, note that we gave the full '''path''' or the '''absolute path''' to which we want to save the file.
  
 
|-
 
|-
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| 2:10
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| 02:18
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| Also, note that we gave the full path or the absolute path to which we want to save the file.
+
| Here, we have used an extension '''dot png''' which means we want to save the image as a '''PNG file'''.
  
 
|-
 
|-
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| 2:18
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|02:25
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| Here we have used an extension <tt>dot png</tt> which means we want to save the image as a PNG file.
+
|Now, let us locate the file '''sine dot png''' which we had saved a while ago.
  
 
|-
 
|-
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|2:25
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| 02:32
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|Now let us locate the file <tt>sine dot png</tt> which we had saved a while ago.
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| We have saved the file to '''slash home slash fossee'''. So, let us navigate to  '''slash home slash fossee''' using the file browser.
  
 
|-
 
|-
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| 2:32
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| 02:49
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| We have saved the file to <tt> slash home slash fossee</tt> so let us navigate to <tt>slash home slash fossee</tt> using thefile browser.
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| Yes, the file '''sine dot png'''  is here.  
  
 
|-
 
|-
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| 2:49
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| 02:52
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| Yes, the file <tt>sine dot png</tt> is here.  
+
| Let us open it and check.
  
 
|-
 
|-
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| 2:52
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| 02:57
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|Let us open it and check.
+
| So, in-order to save a plot, we use '''savefig()''' function.
  
 
|-
 
|-
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| 2:57
+
| 03:05
−
| So in-order to save a plot, we use <tt>savefig</tt> function.
+
| '''dot savefig''' can save the plot in many formats such as:
 +
'''pdf - portable document format''', '''ps - post script''', '''eps - encapsulated post script'''
  
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|-
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'''svg - scalable vector graphics''','''png - portable network graphics''' which support transparency etc.
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| 3:05
+
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| <tt>dot savefig</tt> can save the plot in many formats, such as pdf - portable document format, ps - post script, eps - encapsulated post script, svg - scalable vector graphics, png - portable network graphics which support transparency etc.
+
  
 
|-
 
|-
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| 3:24
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| 03:24
 
| Pause the video here, try out the following exercise and resume the video.
 
| Pause the video here, try out the following exercise and resume the video.
  
 
|-
 
|-
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|3:29
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|03:29
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|Save the sine plot in the EPS format which can be embedded in LaTeX documents.
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|Save the '''sine plot''' in the '''EPS format''' which can be embedded in '''LaTeX document'''s.
  
 
|-
 
|-
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| 3:37
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| 03:37
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| We still have the sine plot with us,let us now save the plot as <tt>sine dot eps</tt>.
+
| We still have the '''sine plot''' with us, let us now '''save''' the plot as '''sine dot eps'''.
  
 
|-
 
|-
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| 3:49
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| 03:49
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| Now, We will save the plot using the function <tt>savefig</tt>, so you can type savefig within brackets in single quotes slash home slash fossee slash sine dot eps and hit enter
+
| Now, we will save the plot using the function '''savefig()'''. So, you can type: '''savefig''' within brackets in single quotes '''slash home slash fossee slash sine dot eps''' and hit '''Enter'''.
  
 
|-
 
|-
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| 4:04
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| 04:04
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| Now let us go to <tt>slash home slash fossee</tt> and see the new file created.
+
| Now, let us go to: '''slash home slash fossee'''  and see the new file created.
  
 
|-
 
|-
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| 4:13
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| 04:13
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| Yes! the new file <tt>sine dot eps</tt> is here.
+
| Yes! the new file '''sine dot eps''' is here.
  
 
|-
 
|-
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| 4:18
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| 04:18
 
| Pause the video here, try out the following exercise and resume the video.
 
| Pause the video here, try out the following exercise and resume the video.
  
 
|-
 
|-
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|4:23
+
|04:23
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|Save the sine plot in PDF, PS and SVG formats.
+
|Save the '''sine plot''' in '''PDF, PS''' and '''SVG format'''s.
  
 
|-
 
|-
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| 4:31
+
| 04:31
 
| This brings us to the end of this tutorial.  
 
| This brings us to the end of this tutorial.  
  
 
|-
 
|-
−
|4:34
+
|04:34
−
|In this tutorial,we have learnt to, Save plots using the <tt>savefig()</tt> function.
+
|In this tutorial, we have learnt to save plots using the '''savefig()''' function.
  
 
|-
 
|-
−
| 4:38
+
| 04:38
−
| then Save the plots in different formats like - pdf - ps - png - svg - eps
+
| Then save the plots in different formats like - '''pdf, ps, png, svg, eps.'''
  
 
|-
 
|-
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| 4:45
+
| 04:45
−
| Here are some self assessment questions for you to solve
+
| Here are some self assessment questions for you to solve-
  
 
|-
 
|-
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|4:48
+
|04:48
−
|1. Which command is used to save a plot. saveplot() savefig() savefigure() saveplt()
+
|1. Which command is used to save a plot. '''saveplot(), savefig(), savefigure(), saveplt()'''?
  
 
|-
 
|-
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|4:59
+
|04:59
−
| 2. <tt>savefig('sine.png')</tt> saves the plot in,
+
| 2. '''savefig('sine.png')''' saves the plot in-
  
 
|-
 
|-
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| 5:04
+
| 05:04
−
| The root directory <tt>/</tt> (on GNU/Linux, Unix based systems), <tt>c colon slash </tt> (on windows).
+
| The '''root''' directory (on GNU/Linux, Unix based systems)- '''c colon slash''' (on windows).
  
 
|-
 
|-
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| 5:14
+
| 05:14
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| The second option. Will result in an error as full path is not supplied.
+
| The second option- Will result in an error as full path is not supplied.
  
 
|-
 
|-
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| 5:18
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| 05:18
−
| The third one.The current working directory.
+
| The third one- The current working directory.
  
 
|-
 
|-
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| 5:21
+
| 05:21
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| and final option is Predefined directory like <tt>/documents</tt>.
+
| and final option is- Predefined directory like "/documents".
  
 
|-
 
|-
−
| 5:26
+
|05:26
−
| And now, the answers,
+
| And now, the answers-
  
 
|-
 
|-
−
| 5:28
+
| 05:28
−
|1.To save a plot,we use the <tt>savefig()</tt> function.
+
|1. To save a plot, we use the '''savefig()''' function.
  
 
|-
 
|-
−
|5:33
+
|05:33
−
|2. Whenever we save a file,it gets saved in the current working directory.
+
|2. Whenever we save a file, it gets saved in the current working directory.
  
 
|-
 
|-
−
| 5:38
+
| 05:38
−
| Hope you have enjoyed and found it useful.
+
| Hope you have enjoyed and found it useful. Thanks.

Latest revision as of 10:32, 27 March 2017

Time Narration
00:00 Hello and welcome to the tutorial on "Saving plots".
00:04 At the end of this tutorial, you will be able to-

Save plots using savefig() function. Save plots in different formats.

00:13 Before beginning this tutorial, we would suggest you to complete the tutorial on "Using plot interactively".
00:19 Now, start your IPython interpreter with the command ipython hyphen pylab.
00:30 As you know, it will start your IPython interpreter with the required python modules for plotting and saving your plots.
00:36 To start with, let us plot a sine wave from minus 3 pi to 3 pi.
00:43 Let us start by calculating the required points for the plot.
00:45 It can be done using linspace as-
00:51 You can type: x = linspace within brackets minus 3 into pi comma 3 into pi comma 100.
00:59 We have stored the required points in 'x'.
01:03 Now, let us plot the points using the 'plot' statement. So, type: plot (x, sinx).
01:18 Done! we have made a very basic sine plot. Now, let us see how to save the plot for future use so that you can embed the plot in your reports.
01:32 So, saving the plot, we will use savefig() function.
01:36 For this, we shall keep the plot window open alongside the terminal.
01:40 The statement is: savefig within brackets in single quotes slash home slash fossee slash sine dot png.
01:52 Notice that savefig() function takes one argument which is the filename. The last 3 characters after the '.' in the filename, is the extension and type of the file which determines the format in which you want to save.
02:10 Also, note that we gave the full path or the absolute path to which we want to save the file.
02:18 Here, we have used an extension dot png which means we want to save the image as a PNG file.
02:25 Now, let us locate the file sine dot png which we had saved a while ago.
02:32 We have saved the file to slash home slash fossee. So, let us navigate to slash home slash fossee using the file browser.
02:49 Yes, the file sine dot png is here.
02:52 Let us open it and check.
02:57 So, in-order to save a plot, we use savefig() function.
03:05 dot savefig can save the plot in many formats such as:

pdf - portable document format, ps - post script, eps - encapsulated post script

svg - scalable vector graphics,png - portable network graphics which support transparency etc.

03:24 Pause the video here, try out the following exercise and resume the video.
03:29 Save the sine plot in the EPS format which can be embedded in LaTeX documents.
03:37 We still have the sine plot with us, let us now save the plot as sine dot eps.
03:49 Now, we will save the plot using the function savefig(). So, you can type: savefig within brackets in single quotes slash home slash fossee slash sine dot eps and hit Enter.
04:04 Now, let us go to: slash home slash fossee and see the new file created.
04:13 Yes! the new file sine dot eps is here.
04:18 Pause the video here, try out the following exercise and resume the video.
04:23 Save the sine plot in PDF, PS and SVG formats.
04:31 This brings us to the end of this tutorial.
04:34 In this tutorial, we have learnt to save plots using the savefig() function.
04:38 Then save the plots in different formats like - pdf, ps, png, svg, eps.
04:45 Here are some self assessment questions for you to solve-
04:48 1. Which command is used to save a plot. saveplot(), savefig(), savefigure(), saveplt()?
04:59 2. savefig('sine.png') saves the plot in-
05:04 The root directory (on GNU/Linux, Unix based systems)- c colon slash (on windows).
05:14 The second option- Will result in an error as full path is not supplied.
05:18 The third one- The current working directory.
05:21 and final option is- Predefined directory like "/documents".
05:26 And now, the answers-
05:28 1. To save a plot, we use the savefig() function.
05:33 2. Whenever we save a file, it gets saved in the current working directory.
05:38 Hope you have enjoyed and found it useful. Thanks.

Contributors and Content Editors

Gaurav, Jyotisolanki, Minal, PoojaMoolya, Sandhya.np14, Sneha

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