Python/C2/Using-the-plot-command-interactively/English-timed - Revision history

PoojaMoolya at 12:31, 20 February 2017

2017-02-20T12:31:21Z

Sandhya.np14 at 16:55, 23 September 2015

2015-09-23T16:55:47Z

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Sandhya.np14 at 15:41, 23 September 2015

2015-09-23T15:41:18Z

Gaurav at 06:44, 10 July 2014

2014-07-10T06:44:47Z

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Sneha at 07:12, 4 March 2013

2013-03-04T07:12:38Z

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Minal: Created page with '{| border=1 !Timing !Visual Cue |- | 0:00 | Hello Friends and welcome to the tutorial on creating simple plots using iPython. |- | 0:06 | I hope you have IPython running on your…'

2013-01-02T10:45:52Z

Created page with '{| border=1 !Timing !Visual Cue |- | 0:00 | Hello Friends and welcome to the tutorial on creating simple plots using iPython. |- | 0:06 | I hope you have IPython running on your…'

New page

{| border=1
!Timing
!Visual Cue
|-
| 0:00
| Hello Friends and welcome to the tutorial on creating simple plots using iPython.

|-
| 0:06
| I hope you have IPython running on your computer.

|-
| 0:10
| At the end of this tutorial, you will be able to,

# Create simple plots of mathematical functions.
# Use the Figure window to study plots better.

|-
| 0:20
| Lets start ipython.

|-
| 0:22
| Open the terminal and type ipython -pylab and hit enter.

|-
| 0:35
| <nowiki>Pylab is a python library which provides plotting functionality</nowiki>.

|-
| 0:39
| It provides many other important mathematical and scientific functions.

|-
| 0:43
| <nowiki>After running IPython -pylab in the shell you will see some information about ipython and pylab followed by the In[1] prompt</nowiki>.

|-
| 0:55
| But if you get an error like `ERROR: matplotlib could NOT be imported! Starting normal IPython.`

|-
| 1:02
|Then you will have to install the matplotlib and run this command again.

|-
| 1:08
| Now type 'linspace' followed by a '?' mark in your ipython shell

|-
| 1:19
| as the documentation says, it returns ''num'' evenly spaced samples, calculated over the interval start and stop.

|-
| 1:29
| To illustrate this, lets try to generate 100 points.

|-
| 1:33
| Type <tt>linspace within brackets 1 comma 100 comma 100 </tt> and hit enter.

|-
| 1:47
| As you can see a sequence of numbers from 1 to 100 appears.

|-
| 1:52
| Now lets try to generate 200 points between 0 and 1.

|-
|1:57
|we do that by typing linspace within brackets 0 comma 1 comma 200.

|-
| 2:11
| Here,0 is the start , 1 the stop and 200 the number of points.

|-
| 2:18
| In linspace the start and stop points can be integers, decimals , or constants.

|-
| 2:24
|Let's try and get 100 points between minus pi to pi.

|-
| 2:30
| Here 'pi' is a constant defined by pylab.

|-
| 2:34
| Save this to the variable,say p.

|-
| 2:52
| If we now type <tt>len within brackets p</tt> we will get the no. of points.

|-
| 3:05
| <tt>len</tt> function gives the no of elements of a sequence.

|-
| 3:11
| Let's try and plot a cosine curve between minus pi and pi. For this we use the plot command. Here cos(p) gets the cosine value at every point corresponding to point p.

|-
| 3:50
| We can save cos(p) to variable cosine and then plot it using the plot function.

|-
| 3:57
| Now to clear the plot ,we use the <tt>clf closing brackets</tt> function

|-
| 4:19
| This is done because if we wish to make another plot, it will overlap the previous plot.

|-
| 4:25
| As we do not wish to clutter the area with overlaid plots , we just clear it with clf().

|-
|4:34
|Now lets try a sine plot.

|-
| 5:04
| We can study the plot better on the plot window by using the various options available on it.

|-
| 5:11
| Let us have a look at these options.

|-
| 5:14
| As we can observe, moving the mouse pointer along the plot gives us the location of each point on the plot

|-
| 5:26
| To the bottom left of the window,there are a few buttons.

|-
| 5:30
|The right most among them is for saving the file.

|-
| 5:35
|Just click on it and type the file name.

|-
| 5:48
|We will save the plot by the name ''sin_curve'' in pdf format.

|-
| 6:00
| As you can see we can specify the format of file from the dropdown.

|-
| 6:05
|Formats like png ,eps ,pdf, ps are available.

|-
| 6:17
| Left to the save button is the slider button by which we can specify the margins.

|-
| 6:25
| Left to this is the zoom button by which we can zoom into the plot.

|-
| 6:30
| Just specify the region to zoom into.

|-
| 6:40
| The button to the left of it can be used to move the axes of the plot.

|-
| 6:50
| The next two buttons with left and right arrow icons change the state of the plot and take it to the previous state it was in.

|-
| 7:00
| It more or less acts like the back and forward button in a browser.

|-
| 7:06
| The last one is 'home' referring to the initial plot.

|-
| 7:13
| Pause the video here, try out the following exercise and resume the video.

|-
| 7:20
|Plot (sin(x) into sin(x)) by x.

|-
| 7:26
| 1. Save the plot by the sin square by x.pdf in pdf format.

|-
| 7:33
| Second one. Zoom and find the maxima.

|-
| 7:37
| 3. Bring it back to initial position.

|-
| 7:44
| Now, lets revise quickly what we have learnt today.

|-
| 7:49
|To Study Ipython with pylab.

|-
| 7:52
| To Use the linspace function to create ''num'' equally spaced points in a region.

|-
| 7:57
|To Find the length of sequences using len function.

|-
| 8:01
| Plot mathematical functions using plot.

|-
| 8:05
| To clear drawing area using clf.

|-
| 8:08
| To Use the UI of plot for studying it better and using functionality like save,zoom and moving the plots on x and y axis.

|-
| 8:23
| Create 100 equally spaced points between minus pi by 2 and pi by 2?

|-
| 8:31
|Second one is. How do you clear a figure in ipython?

|-
| 8:36
|The third one. How do you find the length of a sequence?

|-
| 8:43
| And the answers are,

|-
| 8:45
|1.We use the command ''linspace within brackets minus pi by 2 comma pi by 2 comma 100'' to create 100 equally spaced lines between the points minus pi by 2 and pi by 2.

|-
| 9:03
|Second one. We use clf closing bracket function to clear a figure.

|-
| 9:11
|Third one. ''len within brackets sequence_name'' is the function used to find out the length of a sequence.

|-
| 9:20
| Hope you have enjoyed and found it useful.

|-
| 9:24
| Thank you!

@@ Line 14: / Line 14: @@
 | 00:10
 | At the end of this tutorial, you will be able to:
-# Create simple plots of mathematical functions.
+Create simple plots of mathematical functions.
-# Use the Figure window to study plots better.
+Use the Figure window to study plots better.
 |-
@@ Line 215: / Line 215: @@
 |-
 | 07:49
-|* To Study '''Ipython''' with '''pylab'''.
+|To Study '''Ipython''' with '''pylab'''.
 |-
 | 07:52
-|* To Use the '''linspace '''function to create '''num''' equally spaced points in a region.
+|To Use the '''linspace '''function to create '''num''' equally spaced points in a region.
 |-
 | 07:57
-|* To Find the length of sequences using '''len''' function.
+|To Find the length of sequences using '''len''' function.
 |-
 | 08:01
-|* Plot mathematical functions using '''plot'''.
+|Plot mathematical functions using '''plot'''.
 |-
 | 08:05
-|* To clear drawing area using '''clf'''.
+|To clear drawing area using '''clf'''.
 |-
 | 08:08
-|* To Use the'' UI'' of plot for studying it better and using functionality like '''save, zoom''' and moving the plots on ''x and y axis''.
+|To Use the'' UI'' of plot for studying it better and using functionality like '''save, zoom''' and moving the plots on ''x and y axis''.
 |-

@@ Line 5: / Line 5: @@
 |-
 | 00:00
-| Hello Friends and welcome to the tutorial on ''creating simple plots using iPython''.
+| Hello friends and welcome to the tutorial on ''creating simple plots using iPython''.
 |-
 | 00:06
-| I hope you have, IPython running on your computer.
+| I hope you have '''iPython''' running on your computer.
 |-
 | 00:10
-| At the end of this tutorial, you will be able to,
+| At the end of this tutorial, you will be able to:
-−
 # Create simple plots of mathematical functions.
 # Use the Figure window to study plots better.
@@ Line 20: / Line 19: @@
 |-
 |  00:20
-| Lets start'' ipython''.
+| Let's start''' ipython'''.
 |-
 | 00:22
-| Open the terminal and type ''ipython -pylab'' and hit enter.
+| Open the terminal and type: ''ipython -pylab'' and hit '''Enter'''.
 |-
 | 00:35
-| ''Pylab'' is a python library which provides plotting functionality.
+| '''Pylab''' is a '''python library''' which provides plotting functionality.
 |-
@@ Line 36: / Line 35: @@
 |-
 | 00:43
-| After running, IPython -pylab in the shell you will see some information about ipython and pylab followed by the ''In[1] prompt''
+| After running '''IPython -pylab''' in the '''shell''', you will see some information about 'ipython' and '''pylab''' followed by the '''In[1] prompt'''.
 |-
 | 00:55
-| But if you get an error like `ERROR: ''matplotlib'' could NOT be imported!  Starting normal IPython.`
+| But, if you get an error like 'ERROR: ''matplotlib'' could NOT be imported!  Starting normal IPython.'
 |-
 | 01:02
-|Then you will have to install the ''matplotlib ''and run this command again.
+|then you will have to install the ''matplotlib ''and run this command again.
 |-
 | 01:08
-| Now type 'linspace' followed by a '?' mark in your ipython shell
+| Now type: 'linspace' followed by a '?' mark in your '''ipython shell'''.
 |-
 |  01:19
-| as the documentation says, it returns ''num'' evenly spaced samples, calculated over the interval start and stop.
+| As the documentation says, it "returns 'num' evenly spaced samples, calculated over the interval 'start' and 'stop'".
 |-
 | 01:29
-| To illustrate this, lets try to generate ''100 points''.
+| To illustrate this, let's try to generate ''100 points''.
 |-
 | 01:33
-| Type <tt>linspace within brackets ''1 comma 100 comma 100'' </tt> and hit enter.
+| Type: <tt>linspace within brackets '''1 comma 100 comma 100''' </tt> and hit '''Enter'''.
 |-
 | 01:47
-| As you can see a sequence of numbers from ''1 to 100 appears.
+| As you can see, a sequence of numbers from 1 to 100 appears.
 |-
 | 01:52
-| Now lets try to generate'' 200 points between 0 and 1''.
+| Now let's try to generate 200 points between 0 and 1.
 |-
 |01:57
-|we do that by typing'' linspace'' within brackets ''0 comma 1 comma 200''.
+|we do that by typing''' linspace''' within brackets ''0 comma 1 comma 200''.
 |-