Difference between revisions of "Python/C2/Embellishing-a-plot/English-timed"
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| 00:00 | | 00:00 | ||
− | |Hello friends Welcome to the tutorial on | + | |Hello friends. Welcome to the tutorial on '''Embellishing a Plot'''. |
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| 00:06 | | 00:06 | ||
− | | At the end of this tutorial, you will be able to | + | | At the end of this tutorial, you will be able to- |
− | + | Modify the attributes of the plot -- color, line style, line width. | |
− | + | Add a title to the plot with embedded '''LaTeX'''. | |
− | + | Label X and Y axes. | |
− | + | Add annotations to the plot. | |
− | + | Set and Get the limits of axes. | |
− | + | ||
|- | |- | ||
| 00:27 | | 00:27 | ||
− | | So, | + | | So, before beginning this tutorial, we would suggest you to complete the tutorial on '''Using plot interactively'''. |
|- | |- | ||
| 00:34 | | 00:34 | ||
− | | | + | | So, let us start '''ipython''' with '''pylab''' loaded. Open the terminal and type: '''ipython hyphen pylab'''. |
|- | |- | ||
| 00:48 | | 00:48 | ||
− | | We shall first make a simple plot and start decorating it. | + | | We shall first make a simple '''plot''' and start decorating it. |
|- | |- | ||
| 00:54 | | 00:54 | ||
− | |So type x is equal to linspace within brackets -2,4,20 | + | |So, type: '''x is equal to linspace within brackets '''-2, 4, 20'''. |
|- | |- | ||
| 01:06 | | 01:06 | ||
− | | | + | |Then type plot(x, sin(x)). |
|- | |- | ||
| 01:15 | | 01:15 | ||
− | | As we can see, the default colour and the default thickness of the line is as decided by pylab. | + | | As we can see, the default colour and the default thickness of the line is as decided by '''pylab'''. |
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| 01:44 | | 01:44 | ||
− | | So type clf, then plot within brackets x,sin(x),within single quotes r. | + | | So, type '''clf''', then '''plot''' within brackets '''x, sin(x)''', within single quotes r. |
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| 02:16 | | 02:16 | ||
− | | The thickness of the line can be altered by 'linewidth' argument. | + | | The thickness of the line can be altered by ''''linewidth'''' argument. |
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| 02:20 | | 02:20 | ||
− | |So type plot within brackets x,cos(x),linewidth is equal to 2 | + | |So, type: '''plot''' within brackets '''x, cos(x), linewidth is equal to 2'''. |
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| 02:53 | | 02:53 | ||
− | | So, now switch to terminal for solution A combination of color and | + | | So, now switch to '''terminal''' for solution. A combination of color and line width would do the job for us. |
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| 03:01 | | 03:01 | ||
− | |So , type clf , then type plot x, sin(x),within single quotes b,linewidth is equal to 3. | + | |So, type '''clf''' , then type '''plot x, sin(x)''', within single quotes '''b''', '''linewidth is equal to 3'''. |
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| 03:25 | | 03:25 | ||
− | | So for that type on the terminal clf, then type | + | | So, for that, type on the terminal '''clf''', then type: '''plot x, sin(x), dot''' in single quotes. |
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| 03:49 | | 03:49 | ||
− | | To get the same plot in blue color type clf, then type plot x, sin(x),within single quotes b dot. | + | | To get the same plot in blue color, type: '''clf''', then type '''plot x, sin(x),'''within single quotes '''b dot'''. |
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| 04:02 | | 04:02 | ||
− | | Other available options for passing arguments can be seen in the documentation of plot. | + | | Other available options for passing arguments can be seen in the documentation of '''plot'''. |
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| 04:07 | | 04:07 | ||
− | |To see that we can type in the terminal plot then question mark. | + | |To see that, we can type in the terminal- '''plot''' then question mark. |
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| 04:23 | | 04:23 | ||
− | | So ,pause the video here and do this exercise and then resume the video. | + | | So, pause the video here and do this exercise and then resume the video. |
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| 04:28 | | 04:28 | ||
− | |Plot the sine curve with green filled circles. | + | |Plot the '''sine curve''' with green filled circles. |
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| 04:33 | | 04:33 | ||
− | | | + | | So, for solution, now switch to the terminal. We use the combination of '''linestyle''' and color. |
|- | |- | ||
|04:40 | |04:40 | ||
− | |So ,type clf() then type plot within brackets x,cos(x), within single quotes go. | + | |So, type '''clf()''' then type '''plot''' within brackets '''x, cos(x)''', within single quotes '''go'''. |
|- | |- | ||
|04:56 | |04:56 | ||
− | |So, | + | |So, pause the video here. Try out the following exercise and resume the video. |
|- | |- | ||
|05:02 | |05:02 | ||
− | |Plot the curve of x versus tan(x) in red dash line and linewidth 3. | + | |Plot the curve of 'x' versus 'tan(x)', in red dash line and linewidth 3. |
|- | |- | ||
| 05:13 | | 05:13 | ||
− | | So for solution, we will switch to terminal . | + | | So, for solution, we will switch to terminal. |
|- | |- | ||
| 05:18 | | 05:18 | ||
− | |Here we shall use a combination of linewidth argument and linestyle. | + | |Here, we shall use a combination of '''linewidth''' argument and '''linestyle'''. |
|- | |- | ||
|05:22 | |05:22 | ||
− | |So in terminal you can type clf() then plot within brackets x, cos(x), within single quotes r hyphen hyphen | + | |So, in terminal, you can type '''clf()''' then '''plot''' within brackets '''x, cos(x),''' within single quotes '''r''' hyphen hyphen. |
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| 05:46 | | 05:46 | ||
− | | Let us start with a plot for the function minus x squared plus | + | | Let us start with a plot for the '''function''' '''minus x squared plus 4x minus 5'''. |
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|05:52 | |05:52 | ||
− | |So for that you have to type clf then plot within brackets x,minus x star x plus 4 star x minus 5,'r',linewidth is equal to 2. | + | |So, for that, you have to type: first '''clf''' then '''plot''' within brackets '''x, minus x star x plus 4 star x minus 5, 'r', linewidth is equal to 2'''. |
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| 06:21 | | 06:21 | ||
− | |To add a title to the plot to describe what the plot is,use the title command. | + | |To add a '''title''' to the plot to describe what the plot is, use the '''title''' command. |
|- | |- | ||
|06:26 | |06:26 | ||
− | |So, we can type in the terminal title within brackets and double quotes Parabolic function - x squared plus | + | |So, we can type in the terminal, '''title''' within brackets and double quotes '''Parabolic function - x squared plus 4x minus 5''' |
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|06:42 | |06:42 | ||
− | |The figure now has a title. | + | |The figure now has a '''title'''. |
|- | |- | ||
|06:45 | |06:45 | ||
− | | But it is not formatted and does not look clean. | + | | But, it is not formatted and does not look clean. |
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| 06:49 | | 06:49 | ||
− | | It would look shabby if there were | + | | It would look shabby if there were '''fraction'''s and more '''complex function'''s like '''log''' and '''exp'''. |
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| 06:57 | | 06:57 | ||
− | | So, Wouldn't it be good if the title is seen in LaTeX like formatting? | + | | So, Wouldn't it be good if the title is seen in '''LaTeX''' like formatting? |
|- | |- | ||
| 07:03 | | 07:03 | ||
− | | This is possible by adding a '$' sign before and after the part of the string that should be in LaTeX style. | + | | This is possible by adding a '$' sign before and after the part of the '''string''' that should be in '''LaTeX style'''. |
|- | |- | ||
|07:10 | |07:10 | ||
− | | So in the command you can type title within brackets | + | | So, in the command you can type: '''title''' within brackets '''Parabolic function dollar sign minus x squared plus 4x minus 5 dollar sign'''. |
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| 07:30 | | 07:30 | ||
− | |So, | + | |So, pause the video here. Try out the following exercise and resume the video. |
|- | |- | ||
| 07:35 | | 07:35 | ||
− | | Change the title of the figure such that the whole title is formatted in LaTeX style. | + | | Change the '''title''' of the figure such that the whole title is formatted in '''LaTeX style'''. |
|- | |- | ||
| 07:41 | | 07:41 | ||
− | |So for that | + | |So, for that, switch to terminal for solution. |
|- | |- | ||
| 07:45 | | 07:45 | ||
− | | The solution is to enclose the whole string in between '$'. | + | | The solution is to enclose the whole '''string''' in between '$'. |
|- | |- | ||
|07:51 | |07:51 | ||
− | |So you can type title within brackets dollar sign Parabolic function -x squared plus 4x minus 5 dollar sign. | + | |So, you can type: '''title''' within brackets '''dollar sign Parabolic function -x squared plus 4x minus 5 dollar sign'''. |
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| 08:01 | | 08:01 | ||
− | | Although we have title, the plot is not complete without | + | | Although we have title, the plot is not complete without labeling x and y axes. |
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| 08:12 | | 08:12 | ||
− | |So for that you can type in terminal xlabel within brackets in double quotes x , then ylabel in terminal within brackets in double quotes f of x. | + | |So, for that, you can type in terminal: '''xlabel''' within brackets in double quotes '''x ,''' and then '''ylabel''' in terminal within brackets in double quotes '''f of x'''. |
|- | |- | ||
| 08:31 | | 08:31 | ||
− | | As you can see, xlabel and 'ylabel' | + | | As you can see, '''xlabel''' and '''ylabel''' commandd take a string as an argument. |
|- | |- | ||
| 08:37 | | 08:37 | ||
− | | xlabel sets the label to x-axis as 'x' and ylabel sets the name to the y-axis as 'f(x)'. | + | | '''xlabel''' sets the label to x-axis as 'x' and '''ylabel''' sets the name to the y-axis as 'f(x)'. |
|- | |- | ||
| 08:50 | | 08:50 | ||
− | |So now | + | |So, now pause the video here, try out the following exercise and resume the video. |
|- | |- | ||
| 08:57 | | 08:57 | ||
− | | Set the x and y labels as "x" and "f(x)" in LaTeX style. | + | | Set the x and y labels as "x" and "f(x)" in '''LaTeX style'''. |
|- | |- | ||
| 09:04 | | 09:04 | ||
− | | Since we need LaTeX style formatting, all we have to do is enclose the string in between two | + | | Since we need LaTeX style formatting, all we have to do is enclose the '''string''' in between two dollar symbols ($). |
|- | |- | ||
| 09:10 | | 09:10 | ||
− | | | + | | So now, switch to terminal and type: '''xlabel''' within brackets in double quotes in between two dollar signs '''x''' and then type '''ylabel''' and again brackets double quotes in between two dollar signs '''f of x'''. |
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| 09:37 | | 09:37 | ||
− | | For example the point (2, -1) is the local maxima. | + | | For example, the point (2, -1) is the '''local maxima'''. |
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|09:47 | |09:47 | ||
− | |To do this use the function annotate. | + | |To do this, use the function '''annotate()'''. |
|- | |- | ||
|09:49 | |09:49 | ||
− | |So for that you can type in the terminal annotate within brackets in double quotes local maxima comma xy is equal to within brackets 2 comma -1. | + | |So, for that, you can type in the terminal: '''annotate''' within brackets in double quotes '''local maxima comma xy is equal to''' within brackets '''2 comma -1'''. |
|- | |- | ||
| 10:04 | | 10:04 | ||
− | | As you can see, the first argument to annotate command is the name we would like to mark the point as, | + | | As you can see, the first argument to '''annotate''' command is the name we would like to mark the point as. And, the second argument is the co-ordinates of the point at which the name should appear. |
|- | |- | ||
| 10:18 | | 10:18 | ||
− | | It is a tuple containing two numbers. | + | | It is a '''tuple''' containing two numbers. |
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|10:30 | |10:30 | ||
− | |Make an annotation called "root" at the point (-4, 0). | + | |Make an '''annotation''' called "root", at the point (-4, 0). |
|- | |- | ||
| 10:38 | | 10:38 | ||
− | | What happens to the first annotation ? | + | | What happens to the first annotation? |
|- | |- | ||
| 10:43 | | 10:43 | ||
− | | For that | + | | For that, switch to the '''terminal''' for the solution. |
|- | |- | ||
|10:46 | |10:46 | ||
− | |As we can see, every annotate command makes a new annotation on the figure. | + | |As we can see, every '''annotate''' command makes a new annotation on the figure. |
|- | |- | ||
|10:52 | |10:52 | ||
− | |Now we have everything we need to decorate a plot | + | |Now, we have everything we need to decorate a plot but the plot would be incomplete if we can not set the limits of axes. |
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|11:06 | |11:06 | ||
− | |Else limits also can be get and set from the terminal. | + | |Else, limits also can be get and set from the terminal. |
|- | |- | ||
| 11:13 | | 11:13 | ||
− | | Use "xlim()"function and "ylim()" function to get the | + | | Use "xlim()" function and "ylim()" function to get the '''limit'''s. |
|- | |- | ||
|11:17 | |11:17 | ||
− | |So type in the terminal annotate within brackets in double quotes root comma xy is equal to within brackets minus 4 comma 0. | + | |So, type in the terminal: '''annotate''' within brackets in double quotes '''root''' comma '''xy is equal to''' within brackets '''minus 4 comma 0'''. |
|- | |- | ||
| 11:32 | | 11:32 | ||
− | | xlim function returns the current x axis limits and | + | | '''xlim()''' function returns the current x-axis limits and '''ylim()''' function returns the current y-axis limits. |
|- | |- | ||
|11:41 | |11:41 | ||
− | |Set the | + | |Set the '''limit'''s of x-axis from -4 to 5 by giving command '''xlim(-4,5)'''. So, in the terminal, you can type: '''xlim()''' and then again '''ylim ()''' then type '''xlim(-4,5)'''. |
|- | |- | ||
| 12:12 | | 12:12 | ||
− | | Similarly set the limits of y-axis appropriately.So you can type ylim(-15,2) | + | | Similarly set the limits of y-axis appropriately. So you can type: '''ylim(-15,2)'''. |
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|12:27 | |12:27 | ||
− | |Set the limits of axes such that the area of interest is the rectangle (-1, -15) and (3, 0) | + | |Set the limits of axes such that the area of interest is the rectangle (-1, -15) and (3, 0). |
|- | |- | ||
| 12:37 | | 12:37 | ||
− | | Switch to the terminal for the solution. | + | | Switch to the '''terminal''' for the solution. |
− | + | ||
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|12:51 | |12:51 | ||
− | |So in the command we can type xlim within brackets -1 comma 3 and ylim within brackets -15 comma 0. | + | |So, in the command we can type: '''xlim''' within brackets '''-1 comma 3''' and '''ylim''' within brackets '''-15 comma 0'''. |
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| 13:09 | | 13:09 | ||
− | | This brings us to the end of this tutorial.In this tutorial,we have learnt to | + | | This brings us to the end of this tutorial. In this tutorial, we have learnt to: Modify the attributes of '''plot''' like '''color, line width, line style''' by passing additional '''argument'''s. |
|- | |- | ||
| 13:20 | | 13:20 | ||
− | | Add title to a plot using 'title' command. | + | | Add '''title''' to a plot using 'title' command. |
|- | |- | ||
| 13:24 | | 13:24 | ||
− | | Incorporate LaTeX style formatting by adding a $ sign before and after the part of the string. | + | | Incorporate '''LaTeX''' style formatting by adding a '$' sign before and after the part of the '''string'''. |
|- | |- | ||
| 13:30 | | 13:30 | ||
− | | Label x and y axes using xlabel()function and ylabel() commands. | + | | '''Label''' x and y axes using '''xlabel()''' function and '''ylabel()''' commands. |
|- | |- | ||
| 13:36 | | 13:36 | ||
− | | Then, add annotations to a plot using annotate() command. | + | | Then, add annotations to a plot using '''annotate()''' command. |
|- | |- | ||
| 13:38 | | 13:38 | ||
− | | Get and set the limits of axes using xlim() and ylim() commands. | + | | Get and set the limits of axes using '''xlim()''' and '''ylim()''' commands. |
|- | |- | ||
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| 13:50 | | 13:50 | ||
− | | 1. Draw a plot of cosine graph between -2pi to 2pi with line thickness 4. | + | | 1. Draw a '''plot''' of '''cosine graph''' between '-2pi' to '2pi' with line thickness 4. |
|- | |- | ||
| 13:57 | | 13:57 | ||
− | | 2. Read through the documentation and find out, is there a way to modify the alignment of text in the command ylabel. | + | | 2. Read through the documentation and find out, is there a way to modify the alignment of text in the command '''ylabel'''. |
|- | |- | ||
| 14:05 | | 14:05 | ||
− | | Yes or No are the options. | + | | '''Yes''' or '''No''' are the options. |
|- | |- | ||
| 14:07 | | 14:07 | ||
− | | And the final question. How do you set the title as x^2-5x+6 in LaTex style formatting. | + | | And the final question. How do you set the '''title''' as 'x^2-5x+6' in '''LaTex''' style formatting. |
|- | |- | ||
| 14:15 | | 14:15 | ||
− | | Now, the answers | + | | Now, the answers: |
|- | |- | ||
| 14:20 | | 14:20 | ||
− | | 1. In order to plot a cosine graph between the points -2pi and 2pi with line thickness 4,we use the linspace and plot command as | + | | 1. In order to plot a '''cosine graph''' between the points '-2pi' and '2pi' with line thickness 4, we use the '''linspace''' and '''plot''' command as- '''x = linspace(-2*pi, 2*pi)'''. |
|- | |- | ||
| 14:41 | | 14:41 | ||
− | | then plot(x, cos(x), linewidth=4) | + | | then '''plot(x, cos(x), linewidth=4)''' |
|- | |- | ||
| 14:46 | | 14:46 | ||
− | | And the second answer is No. We do not have an option to modify the alignment of text in the command ylabel. | + | | And the second answer is '''No'''. We do not have an option to modify the alignment of text in the command '''ylabel'''. |
|- | |- | ||
|14:53 | |14:53 | ||
− | | Then the third and final one. To set the title in LaTex style formatting,we write the equation between two dollar signs as, | + | | Then the third and final one. To set the title in '''LaTex''' style formatting, we write the equation between two dollar signs as, |
− | + | '''title("$x^2-5x+6$")'''. | |
− | + | ||
|- | |- | ||
| 15:11 | | 15:11 | ||
| Hope you have enjoyed this tutorial and found it useful. | | Hope you have enjoyed this tutorial and found it useful. | ||
− | |||
− | |||
|} | |} |
Latest revision as of 18:00, 20 February 2017
Time | Narration |
00:00 | Hello friends. Welcome to the tutorial on Embellishing a Plot. |
00:06 | At the end of this tutorial, you will be able to-
Modify the attributes of the plot -- color, line style, line width. Add a title to the plot with embedded LaTeX. Label X and Y axes. Add annotations to the plot. Set and Get the limits of axes. |
00:27 | So, before beginning this tutorial, we would suggest you to complete the tutorial on Using plot interactively. |
00:34 | So, let us start ipython with pylab loaded. Open the terminal and type: ipython hyphen pylab. |
00:48 | We shall first make a simple plot and start decorating it. |
00:54 | So, type: x is equal to linspace within brackets -2, 4, 20. |
01:06 | Then type plot(x, sin(x)). |
01:15 | As we can see, the default colour and the default thickness of the line is as decided by pylab. |
01:23 | Wouldn't it be nice if we could control these parameters in the plot? |
01:28 | This is possible by passing additional arguments to the plot command. |
01:33 | We shall first clear the figure and plot the same by passing the additional color argument. |
01:39 | Pass the argument 'r' for red color. |
01:44 | So, type clf, then plot within brackets x, sin(x), within single quotes r. |
02:13 | The same plot is seen in red color. |
02:16 | The thickness of the line can be altered by 'linewidth' argument. |
02:20 | So, type: plot within brackets x, cos(x), linewidth is equal to 2. |
02:34 | Now, a plot with line thickness 2 is produced. |
02:40 | Pause the video here and do this exercise and then resume the video. |
02:45 | Plot sin(x) in blue color along with linewidth as 3. |
02:53 | So, now switch to terminal for solution. A combination of color and line width would do the job for us. |
03:01 | So, type clf , then type plot x, sin(x), within single quotes b, linewidth is equal to 3. |
03:16 | To get the style of line as bunch of points not joined, pass the linestyle argument with or without color argument. |
03:25 | So, for that, type on the terminal clf, then type: plot x, sin(x), dot in single quotes. |
03:43 | We get a plot with only points. |
03:49 | To get the same plot in blue color, type: clf, then type plot x, sin(x),within single quotes b dot. |
04:02 | Other available options for passing arguments can be seen in the documentation of plot. |
04:07 | To see that, we can type in the terminal- plot then question mark. |
04:19 | So, you can actually go through the documentation. |
04:23 | So, pause the video here and do this exercise and then resume the video. |
04:28 | Plot the sine curve with green filled circles. |
04:33 | So, for solution, now switch to the terminal. We use the combination of linestyle and color. |
04:40 | So, type clf() then type plot within brackets x, cos(x), within single quotes go. |
04:56 | So, pause the video here. Try out the following exercise and resume the video. |
05:02 | Plot the curve of 'x' versus 'tan(x)', in red dash line and linewidth 3. |
05:13 | So, for solution, we will switch to terminal. |
05:18 | Here, we shall use a combination of linewidth argument and linestyle. |
05:22 | So, in terminal, you can type clf() then plot within brackets x, cos(x), within single quotes r hyphen hyphen. |
05:36 | Now that we know how to produce a bare minimum plot with color, style and thickness of our interest, we shall look at further decorating the plot. |
05:46 | Let us start with a plot for the function minus x squared plus 4x minus 5. |
05:52 | So, for that, you have to type: first clf then plot within brackets x, minus x star x plus 4 star x minus 5, 'r', linewidth is equal to 2. |
06:16 | As you can see, the figure does not have any description describing the plot. |
06:21 | To add a title to the plot to describe what the plot is, use the title command. |
06:26 | So, we can type in the terminal, title within brackets and double quotes Parabolic function - x squared plus 4x minus 5 |
06:42 | The figure now has a title. |
06:45 | But, it is not formatted and does not look clean. |
06:49 | It would look shabby if there were fractions and more complex functions like log and exp. |
06:57 | So, Wouldn't it be good if the title is seen in LaTeX like formatting? |
07:03 | This is possible by adding a '$' sign before and after the part of the string that should be in LaTeX style. |
07:10 | So, in the command you can type: title within brackets Parabolic function dollar sign minus x squared plus 4x minus 5 dollar sign. |
07:26 | As we can see, the polynomial is now formatted. |
07:30 | So, pause the video here. Try out the following exercise and resume the video. |
07:35 | Change the title of the figure such that the whole title is formatted in LaTeX style. |
07:41 | So, for that, switch to terminal for solution. |
07:45 | The solution is to enclose the whole string in between '$'. |
07:51 | So, you can type: title within brackets dollar sign Parabolic function -x squared plus 4x minus 5 dollar sign. |
08:01 | Although we have title, the plot is not complete without labeling x and y axes. |
08:05 | we shall label x-axis to "x" and y-axis to "f(x)". |
08:12 | So, for that, you can type in terminal: xlabel within brackets in double quotes x , and then ylabel in terminal within brackets in double quotes f of x. |
08:31 | As you can see, xlabel and ylabel commandd take a string as an argument. |
08:37 | xlabel sets the label to x-axis as 'x' and ylabel sets the name to the y-axis as 'f(x)'. |
08:50 | So, now pause the video here, try out the following exercise and resume the video. |
08:57 | Set the x and y labels as "x" and "f(x)" in LaTeX style. |
09:04 | Since we need LaTeX style formatting, all we have to do is enclose the string in between two dollar symbols ($). |
09:10 | So now, switch to terminal and type: xlabel within brackets in double quotes in between two dollar signs x and then type ylabel and again brackets double quotes in between two dollar signs f of x. |
09:31 | The plot is now almost complete except that the points are not named. |
09:37 | For example, the point (2, -1) is the local maxima. |
09:42 | We would like to name the point accordingly. |
09:47 | To do this, use the function annotate(). |
09:49 | So, for that, you can type in the terminal: annotate within brackets in double quotes local maxima comma xy is equal to within brackets 2 comma -1. |
10:04 | As you can see, the first argument to annotate command is the name we would like to mark the point as. And, the second argument is the co-ordinates of the point at which the name should appear. |
10:18 | It is a tuple containing two numbers. |
10:20 | The first is x co-ordinate and second is y co-ordinate. |
10:25 | Pause the video, do this exercise and then resume the video. |
10:30 | Make an annotation called "root", at the point (-4, 0). |
10:38 | What happens to the first annotation? |
10:43 | For that, switch to the terminal for the solution. |
10:46 | As we can see, every annotate command makes a new annotation on the figure. |
10:52 | Now, we have everything we need to decorate a plot but the plot would be incomplete if we can not set the limits of axes. |
11:01 | This can be done using the button provided on the plot window. |
11:06 | Else, limits also can be get and set from the terminal. |
11:13 | Use "xlim()" function and "ylim()" function to get the limits. |
11:17 | So, type in the terminal: annotate within brackets in double quotes root comma xy is equal to within brackets minus 4 comma 0. |
11:32 | xlim() function returns the current x-axis limits and ylim() function returns the current y-axis limits. |
11:41 | Set the limits of x-axis from -4 to 5 by giving command xlim(-4,5). So, in the terminal, you can type: xlim() and then again ylim () then type xlim(-4,5). |
12:12 | Similarly set the limits of y-axis appropriately. So you can type: ylim(-15,2). |
12:22 | Pause the video, do this exercise and then resume the video. |
12:27 | Set the limits of axes such that the area of interest is the rectangle (-1, -15) and (3, 0). |
12:37 | Switch to the terminal for the solution. |
12:40 | As we can see, the lower and upper limits of x-axis in the exercise are -1 and 3 respectively. |
12:46 | The lower and upper limits of y-axis are -15 and 0 respectively. |
12:51 | So, in the command we can type: xlim within brackets -1 comma 3 and ylim within brackets -15 comma 0. |
13:02 | This gives us the required rectangle. |
13:09 | This brings us to the end of this tutorial. In this tutorial, we have learnt to: Modify the attributes of plot like color, line width, line style by passing additional arguments. |
13:20 | Add title to a plot using 'title' command. |
13:24 | Incorporate LaTeX style formatting by adding a '$' sign before and after the part of the string. |
13:30 | Label x and y axes using xlabel() function and ylabel() commands. |
13:36 | Then, add annotations to a plot using annotate() command. |
13:38 | Get and set the limits of axes using xlim() and ylim() commands. |
13:46 | Here are some self assessment questions for you to solve. |
13:50 | 1. Draw a plot of cosine graph between '-2pi' to '2pi' with line thickness 4. |
13:57 | 2. Read through the documentation and find out, is there a way to modify the alignment of text in the command ylabel. |
14:05 | Yes or No are the options. |
14:07 | And the final question. How do you set the title as 'x^2-5x+6' in LaTex style formatting. |
14:15 | Now, the answers: |
14:20 | 1. In order to plot a cosine graph between the points '-2pi' and '2pi' with line thickness 4, we use the linspace and plot command as- x = linspace(-2*pi, 2*pi). |
14:41 | then plot(x, cos(x), linewidth=4) |
14:46 | And the second answer is No. We do not have an option to modify the alignment of text in the command ylabel. |
14:53 | Then the third and final one. To set the title in LaTex style formatting, we write the equation between two dollar signs as,
title("$x^2-5x+6$"). |
15:11 | Hope you have enjoyed this tutorial and found it useful. |
Contributors and Content Editors
Gaurav, Kavita salve, Minal, PoojaMoolya, Sandhya.np14, Sneha