Difference between revisions of "Scilab/C2/Plotting-2D-graphs/English-timed"

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|-
 
|-
 
| 00:00
 
| 00:00
−
| | Welcome to the spoken tutorial on Plotting 2D graphs with scilab.
+
| | Welcome to the spoken tutorial on '''Plotting 2D graphs''' with '''Scilab'''.
  
 
|-
 
|-
 
| 00:04
 
| 00:04
−
| Assuming that Scilab is installed on your computer, we will discuss plots in Scilab.
+
| Assuming that Scilab is installed on your computer, we will discuss '''plots''' in Scilab.
  
 
|-
 
|-
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|-
 
|-
 
|00:15
 
|00:15
−
|The several common charts Scilab can create are: x-y plots, contour plots, 3D plots, histograms, bar charts, etc...
+
|The several common charts Scilab can create are: '''x-y plots, contour plots, 3D plots, histograms, bar charts''' etc...
  
 
|-
 
|-
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|-
 
|-
 
|00:34
 
|00:34
−
|In order to Plot, we need a set of points. Let us create a sequence of equally spaced points.
+
|In order to plot, we need a set of points. Let us create a sequence of equally spaced points.
  
 
|-
 
|-
 
| 00:39
 
| 00:39
−
| This can be done by the linspace command which creates a linearly equally spaced vector.
+
| This can be done by the '''linspace''' command which creates a linearly equally spaced vector.
  
 
|-
 
|-
 
| 00:45
 
| 00:45
−
|For Example
+
|For Example,
  
 
|-
 
|-
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|00:48
 
|00:48
  
−
| x is a row vector with 5 points linearly equally spaced between 1 and 10
+
| '''x''' is a row vector with 5 points linearly equally spaced between 1 and 10.
  
 
|-
 
|-
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| 00:57
 
| 00:57
  
−
| Similarly y is a row vector with linearly equally spaced 5 points between 1 and 20
+
| Similarly '''y''' is a row vector with linearly equally spaced 5 points between 1 and 20.
  
 
|-
 
|-
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|01:08
 
|01:08
  
−
|| More information on linspace can be obtained from the Help documentation.
+
|| More information on '''linspace''' can be obtained from the '''Help''' documentation.
  
 
|-
 
|-
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|01:14
 
|01:14
  
−
| | We will now plot a graph with the arguments x and y using the Plot function.
+
| | We will now plot a graph with the arguments x and y using the '''plot''' function.
  
 
|-
 
|-
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|01:19
 
|01:19
  
−
|| This is similar to the one used in matlab.
+
|| This is similar to the one used in '''matlab'''.
  
 
|-
 
|-
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| 01:23
 
| 01:23
  
−
| | Plot x,y creates a graph of x verses y as you see.
+
| | '''plot(x,y)''' creates a graph of x verses y as you see.
  
 
|-
 
|-
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|01:31
 
|01:31
  
−
| | Notice that the graphics window is labeled as '0'  
+
| | Notice that the '''Graphics window''' is labeled as '0'.
  
 
|-
 
|-
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| 01:36
 
| 01:36
  
−
| We will open another graphic window using the xset function.  
+
| We will open another graphic window using the '''xset''' function.  
  
 
|-
 
|-
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| 01:43
 
| 01:43
  
−
|  Cut the xset function, paste in scilab hit enter.
+
|  Cut the '''xset''' function, paste in Scilab, hit Enter.
  
 
|-
 
|-
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|01:50
 
|01:50
  
−
| You will see a graphic window number 1.  
+
| You will see a '''Graphic window number 1'''.  
  
 
|-
 
|-
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|01:54
 
|01:54
  
−
| Note that two arguments are passed to this function namely the window and 1.
+
| Note that two arguments are passed to this function namely the 'window' and 1.
  
 
|-
 
|-
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| 02:06
 
| 02:06
  
−
|| For scilab plot 2d is the native function used to plot 2d graphs.
+
|| For Scilab, '''plot2d''' is the native function used to plot 2d graphs.
  
 
|-
 
|-
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| 02:14
 
| 02:14
  
−
| | plot2d command plots a graph of x verses y as you see.
+
| | '''plot2d''' command plots a graph of x verses y as you see.
  
 
|-
 
|-
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|02:26
 
|02:26
  
−
|| Notice that there is a third argument called style.
+
|| Notice that there is a third argument called 'style'.
  
 
|-
 
|-
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| 02:31
 
| 02:31
  
−
| | Style argument is optional.It is used to customize the appearance of the plot.
+
| | '''style''' argument is optional. It is used to customize the appearance of the plot.
  
 
|-
 
|-
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|02:36
 
|02:36
  
−
| | For positive values of style the curve is a plain with different colours like green for 3 in our case.
+
| | For positive values of style, the curve is plain with different colours like green for 3 in our case.
  
 
|-
 
|-
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|02:51
 
|02:51
  
−
| | Also we can set the start points and end points for x and y axis by passing the fourth argument.
+
| | Also we can set the start points and end points for x and y axes by passing the fourth argument.
  
 
|-
 
|-
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|02:57
 
|02:57
  
−
|It is called rect. As you see,
+
|It is called '''rect'''. As you see,
  
 
|-
 
|-
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| 03:07
 
| 03:07
  
−
||  We have x axis starting from 1 to 10 and y axis from 1 to 20.
+
||  we have x axis starting from 1 to 10 and y axis from 1 to 20.
  
 
|-
 
|-
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| 03:14
 
| 03:14
  
−
| The order of argument in the rect command is xmin, ymin, xmax and ymax.
+
| The order of argument in the '''rect''' command is xmin, ymin, xmax and ymax.
  
 
|-
 
|-
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| 03:24
 
| 03:24
  
−
|| Let us now learn about Title,Axis and Legends
+
|| Let us now learn about title, axis and legends.
  
 
|-
 
|-
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|03:28
 
|03:28
  
−
|| To configure labels to the axis and title to the plot we can use the commands title, x label and ylabel.
+
|| To configure labels to the axis and title to the plot we can use the commands '''title, xlabel''' and '''ylabel'''.
  
 
|-
 
|-
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| 03:38
 
| 03:38
  
−
|| I will cut this set of commands and paste in the console. Hit enter
+
|| I will cut this set of commands and paste in the console. Hit Enter.
  
 
|-
 
|-
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| 03:45
 
| 03:45
  
−
| | You will see that the graph has been labeled x to the x axis, y to the y axis and the title of the graph is my title.
+
| | You will see that the graph has been labeled x to the x-axis, y to the y-axis and the title of the graph is 'My title'.
  
 
|-
 
|-
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|03:58
 
|03:58
  
−
| | You may want to configure the title and axis of the plot in a single command instead of 3
+
| | You may want to configure the '''title''' and '''axes''' of the plot in a single command instead of 3
 
|-
 
|-
  
 
| 04:04
 
| 04:04
  
−
| |For this purpose we use the xtitle  command with all the 3 arguments.
+
| |For this purpose we use the '''xtitle''' command with all the 3 arguments.
  
 
|-
 
|-
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| 04:11
 
| 04:11
  
−
| | I will cut this command paste in scilab enter.
+
| | I will cut this command, paste in scilab, '''Enter'''.
  
 
|-
 
|-
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|04:18
 
|04:18
  
−
| | Now you see that the x axis label is X axis , Y axis and the title is My title.
+
| | Now you see that the x axis label is X axis , Y axis and the title is 'My title'.
  
 
|-
 
|-
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|04:26
 
|04:26
  
−
| | The clf() function that i am typing now will clear the graphic window as you see.
+
| | The '''clf()''' function that I am typing now, will clear the graphic window as you see.
  
 
|-
 
|-
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| 04:36
 
| 04:36
  
−
| | It is useful while plotting different graph on the same graphic window.
+
| | It is useful while plotting different graphs on the same graphic window.
  
 
|-
 
|-
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| 04:51
 
| 04:51
  
−
| | Let us see an example for this I will scroll down
+
| | Let us see an example for this, I will scroll down.
  
 
|-
 
|-
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|04:56
 
|04:56
  
−
|| We will define the x axis points in a row vector x using the linspace command
+
|| We will define the x-axis points in a row vector '''x''' using the '''linspace''' command.
  
 
|-
 
|-
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|05:03
 
|05:03
  
−
|| Let us define a function
+
|| Let us define a function  
  
 
|-
 
|-
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| 05:05
 
| 05:05
  
−
| |y1 = x square
+
| |y1 = x square.
  
 
|-
 
|-
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| 05:07
 
| 05:07
  
−
| |plot x verses y1
+
| |plot x verses y1.
  
 
|-
 
|-
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|05:10
 
|05:10
  
−
| | define another function y2 = 2x square
+
| | Define another function y2 = 2 x square.
  
 
|-
 
|-
 
|05:15
 
|05:15
−
| |plot x verses y2
+
| |plot x verses y2.
  
 
|-
 
|-
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| 05:17
 
| 05:17
  
−
| | We will also give label and title to our graph
+
| | We will also give label and title to our graph.
  
 
|-
 
|-
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|05:22
 
|05:22
  
−
|| Notice that we have additionally passed ”o-” and ”+ -” commands to the plot function, to change the appearance of the curve
+
|| Notice that we have additionally passed ”o-” and ”+ -” commands to the plot function, to change the appearance of the curve.
  
 
|-
 
|-
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|05:33
 
|05:33
  
−
| "| These arguments are not a part of the plot2d function.
+
| | These arguments are not a part of the '''plot2d''' function.
  
 
|-
 
|-
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| 05:37
 
| 05:37
  
−
| | They can be used only with the plot function
+
| | They can be used only with the '''plot''' function.
  
 
|-
 
|-
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| 05:41
 
| 05:41
  
−
| | I will copy these set of commands and paste in the scilab console.
+
| | I will copy these set of commands and paste in the Scilab console.
  
 
|-
 
|-
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| 05:49
 
| 05:49
  
−
| | You see the graph
+
| | You see the graph.
  
 
|-
 
|-
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| 05:56
 
| 05:56
  
−
|| This can be achieved using the legend command,  as you see
+
|| This can be achieved using the '''legend''' command as you see.
  
 
|-
 
|-
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| 06:08
 
| 06:08
  
−
|| "o-" curve represents function y1=x square  and "+-" curve represents function y2=2*x^2 (y2=2x square)
+
|| "o-" curve represents function y1=x square  and "+-" curve represents function y2=2*x^2 (y2=2x square)
  
 
|-
 
|-
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| 06:19
 
| 06:19
  
−
|| I will close this graphic window
+
|| I will close this graphic window.
  
 
|-
 
|-
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| 06:22
 
| 06:22
  
−
| | We will now discuss about plot2d demos and subplot function
+
| | We will now discuss about '''plot2d demos''' and '''subplot''' function.
  
 
|-
 
|-
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| 06:28
 
| 06:28
  
−
| | Scilab provides demos for all its major functions.  
+
| | Scilab provides '''demos''' for all its major functions.  
  
 
|-
 
|-
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| 06:31
 
| 06:31
  
−
| Demos of plot2d can be viewed through the demonstration tab.
+
| '''Demos''' of '''plot2d''' can be viewed through the '''demonstration''' tab.
  
 
|-
 
|-
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|06:39
 
|06:39
  
−
| | Click on Graphics, click 2d_3d plots and select a demo out of the various demos provided.  
+
| | Click on '''Graphics''', click '''2D and 3D plots''' and select a demo out of the various demos provided.  
  
 
|-
 
|-
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|06:51
 
|06:51
  
−
| I will click on plot2d.
+
| I will click on '''plot2d'''.
  
 
|-
 
|-
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| 06:54
 
| 06:54
  
−
| | You will see the demo graph
+
| | You will see the demo graph.
  
 
|-
 
|-
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|06:55
 
|06:55
  
−
|| The code for this graph can also be seen by clicking on the view code button here.
+
|| The code for this graph can also be seen by clicking on the '''view code''' button here.
  
 
|-
 
|-
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| 07:02
 
| 07:02
  
−
| | This link does not open in Mac OS but  it works in windows and linux
+
| | This link does not open in '''Mac OS''' but  it works in '''Windows''' and '''Linux'''.
  
 
|-
 
|-
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|07:15
 
|07:15
  
−
| | Currently i am in demos directory of scilab 5.2 as shown.
+
| | Currently I am in 'demos' directory of Scilab 5.2 as shown.
  
 
|-
 
|-
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|07:27
 
|07:27
  
−
|| We will type ls to see the list of demos available, as you see here.
+
|| We will type '''ls''' to see the list of demos available, as you see here.
  
 
|-
 
|-
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| 07:36
 
| 07:36
  
−
| Then we will select the 2d_3d_plots directory and hit enter.  
+
| Then we will select the 2d_3d_plots directory and hit '''Enter'''.  
  
 
|-
 
|-
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| 07:46
 
| 07:46
  
−
| Type ls again to see the various demo code available in the sce files
+
| Type '''ls''' again to see the various '''demo code''' available in the 'sce' files.
  
 
|-
 
|-
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| 07:55
 
| 07:55
  
−
| | we will view the code for the demo which we have seen earlier.
+
| | We will view the code for the demo which we have seen earlier.
  
 
|-
 
|-
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| 08:00
 
| 08:00
  
−
| | Type more plot2d.dem.sce and hit enter
+
| | Type '''more plot2d.dem.sce''' and hit '''Enter'''.
  
 
|-
 
|-
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|08:11
 
|08:11
  
−
|| Here you will see the code for the demo graph of plot2d function
+
|| Here you will see the code for the demo graph of plot2d function.
  
 
|-
 
|-
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| 08:21
 
| 08:21
  
−
|I will close the demo graph and the demo window
+
|I will close the demo graph and the demo window.
  
 
|-
 
|-
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| 08:26
 
| 08:26
  
−
| | Similarly you can go through the other demos and explore scilab
+
| | Similarly you can go through the other demos and explore Scilab.
  
 
|-
 
|-
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|08:29
 
|08:29
  
−
| | Let us now discuss about Subplot function
+
| | Let us now discuss about '''subplot''' function.
  
 
|-
 
|-
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| 08:33
 
| 08:33
  
−
|| The subplot() function divides the graphics window into a matrix of sub-windows.
+
|| The '''subplot()''' function divides the graphics window into a matrix of sub-windows.
  
 
|-
 
|-
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| 08:37
 
| 08:37
  
−
| | To explain this function we will use demos for plotting 2D graphs in scilab.
+
| | To explain this function we will use demos for plotting 2D graphs in Scilab.
  
 
|-
 
|-
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| 08:43
 
| 08:43
  
−
| |For example, type plot 2d in your console and see the demo plot for this function
+
| |For example, type '''plot2d''' in your console and see the demo plot for this function.
  
 
|-
 
|-
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| 09:00
 
| 09:00
  
−
| The subplot command breaks the graphics window into a 2 by 2 matrix of sub-windows represented by the first two arguments in the subplot command.
+
| The '''subplot''' command breaks the graphics window into a '2 by 2' matrix of sub-windows represented by the first two arguments in the subplot command.
  
 
|-
 
|-
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| 09:10
 
| 09:10
  
−
| |The third argument denotes the current window in which the plot will be plotted
+
| |The third argument denotes the current window in which the plot will be plotted.
  
 
|-
 
|-
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| 09:15
 
| 09:15
  
−
|| I will execute this whole set of commands by copying it to the scilab console
+
|| I will execute this whole set of commands by copying it to the scilab console.
  
 
|-
 
|-
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| 09:28
 
| 09:28
  
−
| | The plot obtained can be saved as a image on your computer
+
| | The plot obtained can be saved as an image on your computer.
  
 
|-
 
|-
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| 09:32
 
| 09:32
  
−
| Click on the graphic window, go to File menu select export to .
+
| Click on the graphic window, go to '''File''' menu, select '''Export to''' .
  
 
|-
 
|-
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| 09:39
 
| 09:39
  
−
| | Give a suitable title to your plot,
+
| | Give a suitable title to your plot.
  
 
|-
 
|-
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| 09:59
 
| 09:59
  
−
| | I will select the JPEG format and Click Save.
+
| | I will select the JPEG format and click '''Save'''.
  
 
|-
 
|-
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| 10:11
 
| 10:11
  
−
| | This brings us to the end of this spoken tutorial on Plotting in Scilab.
+
| | This brings us to the end of this spoken tutorial on '''Plotting in Scilab'''.
  
 
|-
 
|-
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|10:29
 
|10:29
  
−
| | More information on the same is available on the following link
+
| | More information on the same is available on the following link.
  
 
|-
 
|-
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|10:32
 
|10:32
  
−
| |Thanks for joining. Good bye
+
| |Thanks for joining. Good bye.
  
 
|}
 
|}

Revision as of 11:50, 26 February 2015

Time Narration
00:00 Welcome to the spoken tutorial on Plotting 2D graphs with Scilab.
00:04 Assuming that Scilab is installed on your computer, we will discuss plots in Scilab.
00:10 Scilab offers many ways to create and customize various types of 2D and 3D plots.
00:15 The several common charts Scilab can create are: x-y plots, contour plots, 3D plots, histograms, bar charts etc...
00:24 Now open your Scilab console window.
00:28 I will use Plotting.sce file to cut and paste the commands.
00:34 In order to plot, we need a set of points. Let us create a sequence of equally spaced points.
00:39 This can be done by the linspace command which creates a linearly equally spaced vector.
00:45 For Example,
00:48 x is a row vector with 5 points linearly equally spaced between 1 and 10.
00:57 Similarly y is a row vector with linearly equally spaced 5 points between 1 and 20.
01:08 More information on linspace can be obtained from the Help documentation.
01:14 We will now plot a graph with the arguments x and y using the plot function.
01:19 This is similar to the one used in matlab.
01:23 plot(x,y) creates a graph of x verses y as you see.
01:31 Notice that the Graphics window is labeled as '0'.
01:36 We will open another graphic window using the xset function.
01:41 I will close this.
01:43 Cut the xset function, paste in Scilab, hit Enter.
01:50 You will see a Graphic window number 1.
01:54 Note that two arguments are passed to this function namely the 'window' and 1.
02:03 The next graph will be plotted on this window.
02:06 For Scilab, plot2d is the native function used to plot 2d graphs.
02:14 plot2d command plots a graph of x verses y as you see.
02:26 Notice that there is a third argument called 'style'.
02:31 style argument is optional. It is used to customize the appearance of the plot.
02:36 For positive values of style, the curve is plain with different colours like green for 3 in our case.
02:44 The default value of style is 1.
02:46 Try plotting graphs for negative values and see the difference in appearance yourself.
02:51 Also we can set the start points and end points for x and y axes by passing the fourth argument.
02:57 It is called rect. As you see,
03:07 we have x axis starting from 1 to 10 and y axis from 1 to 20.
03:14 The order of argument in the rect command is xmin, ymin, xmax and ymax.
03:24 Let us now learn about title, axis and legends.
03:28 To configure labels to the axis and title to the plot we can use the commands title, xlabel and ylabel.
03:38 I will cut this set of commands and paste in the console. Hit Enter.
03:45 You will see that the graph has been labeled x to the x-axis, y to the y-axis and the title of the graph is 'My title'.
03:58 You may want to configure the title and axes of the plot in a single command instead of 3
04:04 For this purpose we use the xtitle command with all the 3 arguments.
04:11 I will cut this command, paste in scilab, Enter.
04:18 Now you see that the x axis label is X axis , Y axis and the title is 'My title'.
04:26 The clf() function that I am typing now, will clear the graphic window as you see.
04:36 It is useful while plotting different graphs on the same graphic window.
04:41 I will close this window.
04:44 Sometimes we need to compare two sets of data in the same plot, that is, one set of x data and two sets of y data.
04:51 Let us see an example for this, I will scroll down.
04:56 We will define the x-axis points in a row vector x using the linspace command.
05:03 Let us define a function
05:05 y1 = x square.
05:07 plot x verses y1.
05:10 Define another function y2 = 2 x square.
05:15 plot x verses y2.
05:17 We will also give label and title to our graph.
05:22 Notice that we have additionally passed ”o-” and ”+ -” commands to the plot function, to change the appearance of the curve.
05:33 These arguments are not a part of the plot2d function.
05:37 They can be used only with the plot function.
05:41 I will copy these set of commands and paste in the Scilab console.
05:49 You see the graph.
05:51 Wouldn't it be of great help to know which curve is associated with which function?
05:56 This can be achieved using the legend command as you see.
06:08 "o-" curve represents function y1=x square and "+-" curve represents function y2=2*x^2 (y2=2x square)
06:19 I will close this graphic window.
06:22 We will now discuss about plot2d demos and subplot function.
06:28 Scilab provides demos for all its major functions.
06:31 Demos of plot2d can be viewed through the demonstration tab.
06:39 Click on Graphics, click 2D and 3D plots and select a demo out of the various demos provided.
06:51 I will click on plot2d.
06:54 You will see the demo graph.
06:55 The code for this graph can also be seen by clicking on the view code button here.
07:02 This link does not open in Mac OS but it works in Windows and Linux.
07:07 Never the less in Mac the code can be viewed through the directory.
07:12 Let us go to the terminal.
07:15 Currently I am in 'demos' directory of Scilab 5.2 as shown.
07:21 The full path to this directory is shown here.
07:27 We will type ls to see the list of demos available, as you see here.
07:36 Then we will select the 2d_3d_plots directory and hit Enter.
07:46 Type ls again to see the various demo code available in the 'sce' files.
07:55 We will view the code for the demo which we have seen earlier.
08:00 Type more plot2d.dem.sce and hit Enter.
08:11 Here you will see the code for the demo graph of plot2d function.
08:18 I will close the terminal.
08:21 I will close the demo graph and the demo window.
08:26 Similarly you can go through the other demos and explore Scilab.
08:29 Let us now discuss about subplot function.
08:33 The subplot() function divides the graphics window into a matrix of sub-windows.
08:37 To explain this function we will use demos for plotting 2D graphs in Scilab.
08:43 For example, type plot2d in your console and see the demo plot for this function.
08:58 I will close this window.
09:00 The subplot command breaks the graphics window into a '2 by 2' matrix of sub-windows represented by the first two arguments in the subplot command.
09:10 The third argument denotes the current window in which the plot will be plotted.
09:15 I will execute this whole set of commands by copying it to the scilab console.
09:24 You can see 4 plots in a single plot window .
09:28 The plot obtained can be saved as an image on your computer.
09:32 Click on the graphic window, go to File menu, select Export to .
09:39 Give a suitable title to your plot.
09:50 Select a destination folder to save your file.
09:54 Select the file format in which you want your image to appear.
09:59 I will select the JPEG format and click Save.
10:05 Browse through the directory to open the image and verify yourself whether it has been saved or not.
10:11 This brings us to the end of this spoken tutorial on Plotting in Scilab.
10:15 There are many other functions in Scilab which will be covered in other spoken tutorials.
10:20 Keep watching the Scilab links.
10:22 Spoken Tutorials are part of the Talk to a Teacher project, supported by the National Mission on Education through ICT.
10:29 More information on the same is available on the following link.
10:32 Thanks for joining. Good bye.

Contributors and Content Editors

Gaurav, Krupali, PoojaMoolya, Sandhya.np14, Sneha

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