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

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| | Welcome to the spoken tutorial on Plotting 2D graphs with scilab.

| | Welcome to the spoken tutorial on Plotting 2D graphs with scilab.

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| 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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|Scilab offers many ways to create and customize various types of 2D and 3D plots.

|Scilab offers many ways to create and customize various types of 2D and 3D plots.

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|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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|Now open your Scilab console window.

|Now open your Scilab console window.

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|I will use Plotting.sce file to cut and paste the commands.

|I will use Plotting.sce file to cut and paste the commands.

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|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.

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| 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.

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|For Example

|For Example

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| 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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| 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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|| 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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| | 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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|| This is similar to the one used in matlab.

|| This is similar to the one used in matlab.

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| | 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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| | Notice that the graphics window is labeled as '0'  

| | Notice that the graphics window is labeled as '0'  

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| We will open another graphic window using the xset function.  

| We will open another graphic window using the xset function.  

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| I will close this.

| I will close this.

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|  Cut the xset function, paste in scilab hit enter.

|  Cut the xset function, paste in scilab hit enter.

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| You will see a graphic window number 1.  

| You will see a graphic window number 1.  

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| 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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| | The next graph will be plotted on this window.

| | The next graph will be plotted on this window.

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|| For scilab plot 2d is the native function used to plot 2d graphs.

|| For scilab plot 2d is the native function used to plot 2d graphs.

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| | 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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|| Notice that there is a third argument called style.

|| Notice that there is a third argument called style.

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| | 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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| | 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 a plain with different colours like green for 3 in our case.

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| The default value of style is 1.

| The default value of style is 1.

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|| Try plotting graphs for negative values and see the difference in appearance yourself.

|| Try plotting graphs for negative values and see the difference in appearance yourself.

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| | 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 axis by passing the fourth argument.

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|It is called rect. As you see,

|It is called rect. As you see,

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||  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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| 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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|| Let us now learn about Title,Axis and Legends

|| Let us now learn about Title,Axis and Legends

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|| 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, x label and ylabel.

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|| 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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| | 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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| | 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 axis of the plot in a single command instead of 3

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| |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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| | I will cut this command paste in scilab enter.

| | I will cut this command paste in scilab enter.

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| | 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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| | 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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| | It is useful while plotting different graph on the same graphic window.

| | It is useful while plotting different graph on the same graphic window.

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| | I will close this window.

| | I will close this window.

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|| 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.

|| 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.

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| | 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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|| 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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|| Let us define a function

|| Let us define a function

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| |y1 = x square

| |y1 = x square

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| |plot x verses y1

| |plot x verses y1

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| | define another function y2 = 2x square

| | define another function y2 = 2x square

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| |plot x verses y2

| |plot x verses y2

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| | We will also give label and title to our graph

| | We will also give label and title to our graph

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|| 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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| "| These arguments are not a part of the plot2d function.

| "| These arguments are not a part of the plot2d function.

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| | They can be used only with the plot function

| | They can be used only with the plot function

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| | 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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| | You see the graph

| | You see the graph

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| | Wouldn't it be of great help to know which curve is associated with which function?

| | Wouldn't it be of great help to know which curve is associated with which function?

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|| 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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|| "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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|| I will close this graphic window

|| I will close this graphic window

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| | We will now discuss about plot2d demos and subplot function

| | We will now discuss about plot2d demos and subplot function

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| | Scilab provides demos for all its major functions.  

| | Scilab provides demos for all its major functions.  

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| Demos of plot2d can be viewed through the demonstration tab.

| Demos of plot2d can be viewed through the demonstration tab.

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| | Click on Graphics, click 2d_3d plots and select a demo out of the various demos provided.  

| | Click on Graphics, click 2d_3d plots and select a demo out of the various demos provided.  

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| I will click on plot2d.

| I will click on plot2d.

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| | You will see the demo graph

| | You will see the demo graph

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|| 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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| | 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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| | Never the less in Mac the code can be viewed through the directory.

| | Never the less in Mac the code can be viewed through the directory.

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| | Let us go to the terminal.

| | Let us go to the terminal.

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| | 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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| | The full path to this directory is shown here.

| | The full path to this directory is shown here.

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|| 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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| 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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| 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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| | 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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| | Type more plot2d.dem.sce and hit enter

| | Type more plot2d.dem.sce and hit enter

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|| 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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| | I will close the terminal.  

| | I will close the terminal.  

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|I will close the demo graph and the demo window

|I will close the demo graph and the demo window

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| | 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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| | Let us now discuss about Subplot function

| | Let us now discuss about Subplot function

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|| 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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| | 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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| |For example, type plot 2d in your console and see the demo plot for this function

| |For example, type plot 2d in your console and see the demo plot for this function

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| | I will close this window.

| | I will close this window.

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| 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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| |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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|| 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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| | You can see 4 plots in a single plot window .

| | You can see 4 plots in a single plot window .

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| | The plot obtained can be saved as a image on your computer

| | The plot obtained can be saved as a image on your computer

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| 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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| | Give a suitable title to your plot,

| | Give a suitable title to your plot,

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| Select a destination folder to save your file.   

| Select a destination folder to save your file.   

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|Select the file format in which you want your image to appear.

|Select the file format in which you want your image to appear.

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| | I will select the JPEG format and Click Save.

| | I will select the JPEG format and Click Save.

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| Browse through the directory to open the image and verify yourself whether it has been saved or not.

| Browse through the directory to open the image and verify yourself whether it has been saved or not.

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| | 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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|| There are many other functions in Scilab which will be covered in other spoken tutorials.

|| There are many other functions in Scilab which will be covered in other spoken tutorials.

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| | Keep watching the Scilab links.

| | Keep watching the Scilab links.

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| Spoken Tutorials are part of the Talk to a Teacher project, supported by the National Mission on Education through ICT.

| Spoken Tutorials are part of the Talk to a Teacher project, supported by the National Mission on Education through ICT.

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| | 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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|-

| |Thanks for joining. Good bye

| |Thanks for joining. Good bye

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