Difference between revisions of "Scilab/C4/Calling-User-Defined-Functions-in-XCOS/English-timed"
From Script | Spoken-Tutorial
Sandhya.np14 (Talk | contribs) |
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| − | | Welcome to the spoken tutorial on ''' | + | | Welcome to the spoken tutorial on '''Calling user-defined functions in Xcos'''. |
|- | |- | ||
| 00:07 | | 00:07 | ||
| − | | In this tutorial we will learn | + | | In this tutorial we will learn: |
|- | |- | ||
|00:09 | |00:09 | ||
| − | |To write a squaring function in '''Scilab''' | + | |* To write a squaring function in '''Scilab''' |
| − | + | ||
|- | |- | ||
|00:12 | |00:12 | ||
| − | |To use the ''' scifunc''' block in ''' Xcos''' | + | |* To use the ''' scifunc''' block in ''' Xcos''' |
| − | + | ||
|- | |- | ||
| 00:15 | | 00:15 | ||
| − | | To use MUX block to draw multiple plots | + | |* To use MUX block to draw multiple plots |
|- | |- | ||
|00:19 | |00:19 | ||
| − | |To call functions having multiple inputs and outputs | + | |* To call functions having multiple inputs and outputs. |
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| 00:32 | | 00:32 | ||
| − | | You should have | + | | You should have basic knowledge of '''Scilab''', |
| − | + | ||
|- | |- | ||
|00:35 | |00:35 | ||
| − | | | + | |basic knowledge of ''' Xcos'''. |
|- | |- | ||
| 00:38 | | 00:38 | ||
| − | | If not, for relevant tutorials please visit ''' spoken hyphen tutorial dot org''' | + | | If not, for relevant tutorials, please visit ''' spoken hyphen tutorial dot org'''. |
|- | |- | ||
| 00:44 | | 00:44 | ||
| − | | Start ''' Scilab''' on your computer. | + | | Start '''Scilab''' on your computer. |
|- | |- | ||
|00:47 | |00:47 | ||
| − | |In the ''' Scilab''' console, type ''' editor''' and press ''' Enter''' | + | |In the ''' Scilab''' console, type ''' editor''' and press '''Enter'''. |
| − | + | ||
| − | + | ||
|- | |- | ||
|00:53 | |00:53 | ||
| − | |Then type the following code | + | |Then type the following code: |
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|01:10 | |01:10 | ||
|''' y''' is equal to '''a''' raise to 2 | |''' y''' is equal to '''a''' raise to 2 | ||
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| 01:14 | | 01:14 | ||
| − | |put a semicolon in the end | + | |put a semicolon in the end. |
| − | + | ||
|- | |- | ||
| 01:17 | | 01:17 | ||
| − | |The function has one input variable ''' a''' and one output variable ''' y ''' | + | |The function has one input variable ''' a''' and one output variable ''' y '''. |
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|01:24 | |01:24 | ||
| − | |The name of the function is ''' squareit ''' | + | |The name of the function is '''squareit'''. |
| − | + | ||
|- | |- | ||
|01:27 | |01:27 | ||
| − | |This function will do the job of squaring the variable ''' a.''' | + | |This function will do the job of squaring the variable '''a.''' |
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|01:31 | |01:31 | ||
| − | |It will store the result in ''' y.''' | + | |It will store the result in '''y.''' |
| − | + | ||
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|Let us save this file in the desired directory. | |Let us save this file in the desired directory. | ||
| − | |||
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|01:50 | |01:50 | ||
| − | |Switch to the ''' Scilab''' console | + | |Switch to the ''' Scilab''' console. |
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|01:57 | |01:57 | ||
| − | |Two windows will open | + | |Two windows will open, |
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| 01:59 | | 01:59 | ||
| − | | | + | |a '''palette browser''' and an '''untitled Xcos''' window. |
| − | + | ||
|- | |- | ||
| 02:04 | | 02:04 | ||
|Now we will make the ''' Xcos''' diagram. | |Now we will make the ''' Xcos''' diagram. | ||
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|02:06 | |02:06 | ||
| This will access the function '''squareit''' created just now. | | This will access the function '''squareit''' created just now. | ||
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|02:10 | |02:10 | ||
| This can be done by using '''scifunc''' block. | | This can be done by using '''scifunc''' block. | ||
| − | |||
|- | |- | ||
| 02:14 | | 02:14 | ||
| − | |Switch to the ''' palette browser''' window | + | |Switch to the ''' palette browser''' window. |
|- | |- | ||
| 02:17 | | 02:17 | ||
|Click on the ''' User-Defined''' function in the pallet browser. | |Click on the ''' User-Defined''' function in the pallet browser. | ||
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| 02:40 | | 02:40 | ||
|Now double click on the '''scifunc''' block to configure it. | |Now double click on the '''scifunc''' block to configure it. | ||
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| − | |||
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|02:44 | |02:44 | ||
| − | |A window named ''' Scilab multiple values request''' will open | + | |A window named ''' Scilab multiple values request''' will open. |
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|Our function '''squareit''' has only one input and output variable. | |Our function '''squareit''' has only one input and output variable. | ||
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| 03:03 | | 03:03 | ||
| − | | Click on | + | | Click on OK. |
|- | |- | ||
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||A new '''Scilab input value request''' window will open. | ||A new '''Scilab input value request''' window will open. | ||
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| 03:14 | | 03:14 | ||
| − | |This function will be called by the scifunc block | + | |This function will be called by the scifunc block. |
| − | + | ||
| − | + | ||
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|In the text box available, | |In the text box available, | ||
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| 03:22 | | 03:22 | ||
| − | |Type '''y1''' equal to '''squareit''' open bracket '''u1''' close the bracket | + | |Type '''y1''' equal to '''squareit''' open bracket '''u1''' close the bracket. |
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|Note that, here the input and output variables are '''u1''' and '''y1''' respectively. | |Note that, here the input and output variables are '''u1''' and '''y1''' respectively. | ||
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|These should be strictly in '''u''' and '''y''' form and not as per the variable names used in the actual function. | |These should be strictly in '''u''' and '''y''' form and not as per the variable names used in the actual function. | ||
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|Keep clicking on '''Ok''' in the subsequent 3 windows that will appear. | |Keep clicking on '''Ok''' in the subsequent 3 windows that will appear. | ||
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|The '''scifunc''' block is now configured. | |The '''scifunc''' block is now configured. | ||
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| 04:04 | | 04:04 | ||
| − | | In the '''palette browser''' window, click on '''Sources section. ''' | + | | In the '''palette browser''' window, click on '''Sources section.''' |
| − | + | ||
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| 04:29 | | 04:29 | ||
|Drag and drop the '''CScope''' block in the '''untitled Xcos''' window. | |Drag and drop the '''CScope''' block in the '''untitled Xcos''' window. | ||
| − | |||
| − | |||
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| 04:34 | | 04:34 | ||
| − | | Place the block towards the right of the '''scifunc''' block | + | | Place the block towards the right of the '''scifunc''' block. |
| − | + | ||
| − | + | ||
|- | |- | ||
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| Place it away from scifunc block, for convenience. | | Place it away from scifunc block, for convenience. | ||
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| 04:47 | | 04:47 | ||
| − | | This is an event input | + | | This is an event input. |
| − | + | ||
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|we need an event generator block. | |we need an event generator block. | ||
| − | |||
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|In the ''' palette browser window,''' click on '''Sources''' section. | |In the ''' palette browser window,''' click on '''Sources''' section. | ||
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| 05:18 | | 05:18 | ||
| − | |Hence, we need a multiplexer block | + | |Hence, we need a multiplexer block. |
|- | |- | ||
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|This block will multiplex two inputs and generate output on one output port. | |This block will multiplex two inputs and generate output on one output port. | ||
| − | |||
| − | |||
|- | |- | ||
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|Drag and drop the '''MUX''' block in the '''untitled Xcos''' window. | |Drag and drop the '''MUX''' block in the '''untitled Xcos''' window. | ||
| − | |||
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|Now let us connect the blocks together. | |Now let us connect the blocks together. | ||
| − | |||
|- | |- | ||
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|Connect the output port of '''Sinusoid generator''' block to the input port of '''scifunc''' block | |Connect the output port of '''Sinusoid generator''' block to the input port of '''scifunc''' block | ||
| − | |||
| − | |||
|- | |- | ||
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|Then without releasing, move your mouse pointer towards the link between the ''' Sinusoid generator''' block and '''scifunc''' block. | |Then without releasing, move your mouse pointer towards the link between the ''' Sinusoid generator''' block and '''scifunc''' block. | ||
| − | |||
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| 06:39 | | 06:39 | ||
| − | |To bend the link, release the mouse button or click at places | + | |To bend the link, release the mouse button or click at places. |
|- | |- | ||
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| 06:55 | | 06:55 | ||
| − | |Now let us see the configuration of other blocks | + | |Now let us see the configuration of other blocks. |
|- | |- | ||
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| We can change the '''frequency, magnitude''' and '''phase''' of the '''sinusoid generator''' block. | | We can change the '''frequency, magnitude''' and '''phase''' of the '''sinusoid generator''' block. | ||
| − | |||
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| 07:11 | | 07:11 | ||
| − | |We will keep the '''magnitude''' and '''frequency''' as 1 and ''' phase''' as 0 | + | |We will keep the '''magnitude''' and '''frequency''' as 1 and ''' phase''' as 0. |
|- | |- | ||
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| 07:30 | | 07:30 | ||
| − | |Change the ''' Ymin''' parameter to minus 2 and '''Ymax''' parameter to 2 | + | |Change the ''' Ymin''' parameter to minus 2 and '''Ymax''' parameter to 2. |
|- | |- | ||
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| 07:47 | | 07:47 | ||
| − | |click on '''OK''' | + | |click on '''OK'''. |
| − | + | ||
|- | |- | ||
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| 07:50 | | 07:50 | ||
| − | |Now let us configure the '''CLOCK_c''' block | + | |Now let us configure the '''CLOCK_c''' block. |
|- | |- | ||
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| 08:06 | | 08:06 | ||
| − | |Click on OK | + | |Click on OK. |
|- | |- | ||
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| 08:36 | | 08:36 | ||
| − | |Click on '''OK''' | + | |Click on '''OK'''. |
|- | |- | ||
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|Now, click on '''File''' and then click on '''Save''' to save the '''Xcos''' diagram. | |Now, click on '''File''' and then click on '''Save''' to save the '''Xcos''' diagram. | ||
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| 08:56 | | 08:56 | ||
| − | |Click on OK | + | |Click on OK. |
| − | + | ||
|- | |- | ||
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|Note that the '''scifunc''' block will call the ''' squareit''' function. | |Note that the '''scifunc''' block will call the ''' squareit''' function. | ||
| − | |||
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|This will load the '''squareit''' function. | |This will load the '''squareit''' function. | ||
| − | |||
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| 09:28 | | 09:28 | ||
| − | |Open the Xcos diagram file | + | |Open the Xcos diagram file. |
|- | |- | ||
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| 09:31 | | 09:31 | ||
| − | |Click on the '''Start''' button available on the '''menu bar''' of '''Xcos''' window | + | |Click on the '''Start''' button available on the '''menu bar''' of '''Xcos''' window. |
| − | + | ||
|- | |- | ||
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| 10:00 | | 10:00 | ||
| − | |Close the plot window | + | |Close the plot window. |
|- | |- | ||
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| 10:28 | | 10:28 | ||
| − | |Edit the input variables as open bracket '''a''' comma '''b''' close bracket | + | |Edit the input variables as open bracket '''a''' comma '''b''' close bracket. |
|- | |- | ||
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| 10:44 | | 10:44 | ||
| − | |'''y''' is equal to '''b''' plus '''a''' raise to two put a semicolon in the end | + | |'''y''' is equal to '''b''' plus '''a''' raise to two put a semicolon in the end. |
| − | + | ||
| − | + | ||
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| 11:01 | | 11:01 | ||
| − | |'''z''' is equal to 0.5 multiplied by a put a semicolon in the end | + | |'''z''' is equal to 0.5 multiplied by a put a semicolon in the end. |
|- | |- | ||
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| 11:10 | | 11:10 | ||
| − | |Now save the file | + | |Now save the file. |
| − | + | ||
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| 11:12 | | 11:12 | ||
| − | | switch to the xcos window | + | | switch to the xcos window. |
|- | |- | ||
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| 11:19 | | 11:19 | ||
| − | |In the ''' input port size field,''' put a semi colon after 1 comma 1 and type 1 comma one again | + | |In the ''' input port size field,''' put a semi colon after 1 comma 1 and type 1 comma one again. |
|- | |- | ||
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| 11:27 | | 11:27 | ||
| − | |Similarly, in the output port size field, put a semi colon after 1 comma 1 and type 1 comma 1 again | + | |Similarly, in the output port size field, put a semi colon after 1 comma 1 and type 1 comma 1 again. |
|- | |- | ||
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| 11:36 | | 11:36 | ||
| − | |Click on | + | |Click on OK. |
| − | + | ||
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| 11:43 | | 11:43 | ||
| − | | | + | |put a comma after y1 and type y2, |
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| 11:48 | | 11:48 | ||
| − | | | + | |put y1 and y2 in square brackets, |
|- | |- | ||
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| 11:52 | | 11:52 | ||
| − | | | + | |now put a comma after '''u1''' and type '''u2'''. |
|- | |- | ||
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| 11:57 | | 11:57 | ||
| − | |Click on OK | + | |Click on OK. |
|- | |- | ||
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| 12:11 | | 12:11 | ||
| − | |Let me realign the scifunc block | + | |Let me realign the scifunc block. |
|- | |- | ||
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|Place it below the sinusoid generator block. | |Place it below the sinusoid generator block. | ||
| − | |||
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| 12:28 | | 12:28 | ||
| − | |Connect the ''' Constant underscore m''' block to the lower input of the '''scifunc''' block | + | |Connect the ''' Constant underscore m''' block to the lower input of the '''scifunc''' block. |
|- | |- | ||
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| 12:44 | | 12:44 | ||
| − | |Change the ''' input port size''' to 3 | + | |Change the ''' input port size''' to 3. |
|- | |- | ||
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| 12:47 | | 12:47 | ||
| − | |Click on '''OK''' | + | |Click on '''OK'''. |
|- | |- | ||
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| 12:59 | | 12:59 | ||
| − | |Connect the lower output port of the '''scifunc''' block to the lower input port of '''MUX''' block | + | |Connect the lower output port of the '''scifunc''' block to the lower input port of '''MUX''' block. |
| − | + | ||
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| 13:45 | | 13:45 | ||
| − | | amplitude scaled input in red colour | + | | amplitude scaled input in red colour. |
|- | |- | ||
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| 13:59 | | 13:59 | ||
| − | |We also get the amplitude scaled of the input '''sine wave,''' as expected | + | |We also get the amplitude scaled of the input '''sine wave,''' as expected. |
|- | |- | ||
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| 14:05 | | 14:05 | ||
| − | |Close the plot window | + | |Close the plot window. |
|- | |- | ||
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| 14:10 | | 14:10 | ||
| − | |In this tutorial we learnt | + | |In this tutorial we learnt: |
| − | + | ||
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| 14:12 | | 14:12 | ||
| − | |To write a squaring function in '''Scilab''' | + | |* To write a squaring function in '''Scilab''' |
|- | |- | ||
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| 14:15 | | 14:15 | ||
| − | |To use the '''scifunc''' block in '''Xcos ''' | + | |* To use the '''scifunc''' block in '''Xcos ''' |
|- | |- | ||
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| 14:19 | | 14:19 | ||
| − | |To use '''MUX ''' block to draw multiple plots | + | |* To use '''MUX ''' block to draw multiple plots |
|- | |- | ||
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| 14:22 | | 14:22 | ||
| − | |To call functions having multiple input and output | + | |* To call functions having multiple input and output. |
| − | + | ||
|- | |- | ||
|14:26 | |14:26 | ||
| − | | Watch the video available at the following link | + | | Watch the video available at the following link. |
|- | |- | ||
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| 14:29 | | 14:29 | ||
| − | | It | + | | It summarizes the Spoken Tutorial project. |
| − | + | ||
| − | + | ||
|- | |- | ||
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|14:33 | |14:33 | ||
| − | ||If you do not have good bandwidth, you can download and watch it | + | ||If you do not have good bandwidth, you can download and watch it. |
|- | |- | ||
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|14:37 | |14:37 | ||
| − | ||The spoken tutorial project Team | + | ||The spoken tutorial project Team: |
|- | |- | ||
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|14:40 | |14:40 | ||
| − | ||Conducts workshops using spoken tutorials | + | ||Conducts workshops using spoken tutorials. |
| − | + | ||
|- | |- | ||
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|14:43 | |14:43 | ||
| − | ||Gives certificates for those who pass an online test | + | ||Gives certificates for those who pass an online test. |
| − | + | ||
|- | |- | ||
| Line 1,192: | Line 1,129: | ||
||For more details, please write to contact@spoken-tutorial.org | ||For more details, please write to contact@spoken-tutorial.org | ||
| − | |||
|- | |- | ||
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|14:53 | |14:53 | ||
| − | |Spoken Tutorial Project is a part of Talk to a Teacher project | + | |Spoken Tutorial Project is a part of Talk to a Teacher project. |
| − | + | ||
| − | + | ||
|- | |- | ||
| Line 1,211: | Line 1,145: | ||
| 15:05 | | 15:05 | ||
| − | |More information on this mission is available at spoken-tutorial.org/NMEICT-Intro | + | |More information on this mission is available at spoken-tutorial.org/NMEICT-Intro. |
| − | + | ||
| − | + | ||
|- | |- | ||
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|15:15 | |15:15 | ||
| − | | Thank you for joining .Hope you found this tutorial useful | + | | Thank you for joining .Hope you found this tutorial useful. |
|- | |- | ||
| Line 1,225: | Line 1,157: | ||
| 15:19 | | 15:19 | ||
| − | |This is Anuradha Amruthkar from IIT Bombay signing off. | + | |This is Anuradha Amruthkar from IIT Bombay, signing off. |
Revision as of 17:00, 3 March 2015
| Time | Narration |
| 00:01 | Welcome to the spoken tutorial on Calling user-defined functions in Xcos. |
| 00:07 | In this tutorial we will learn: |
| 00:09 | * To write a squaring function in Scilab |
| 00:12 | * To use the scifunc block in Xcos |
| 00:15 | * To use MUX block to draw multiple plots |
| 00:19 | * To call functions having multiple inputs and outputs. |
| 00:24 | Ubuntu 12.04 is the operating system used with Scilab version 5.3.3 installed. |
| 00:32 | You should have basic knowledge of Scilab, |
| 00:35 | basic knowledge of Xcos. |
| 00:38 | If not, for relevant tutorials, please visit spoken hyphen tutorial dot org. |
| 00:44 | Start Scilab on your computer. |
| 00:47 | In the Scilab console, type editor and press Enter. |
| 00:53 | Then type the following code: |
| 00:55 | function space y is equal to squareit open bracket a close bracket |
| 01:07 | Press the enter key and type |
| 01:10 | y is equal to a raise to 2 |
| 01:14 | put a semicolon in the end. |
| 01:17 | The function has one input variable a and one output variable y . |
| 01:24 | The name of the function is squareit. |
| 01:27 | This function will do the job of squaring the variable a. |
| 01:31 | It will store the result in y. |
| 01:34 | Let us save this file in the desired directory. |
| 01:38 | I will save this file with file name squareit and extension .sci |
| 01:44 | Here we are following the convention of saving functions in .sci format. |
| 01:50 | Switch to the Scilab console. |
| 01:53 | Now, type Xcos and press Enter. |
| 01:57 | Two windows will open, |
| 01:59 | a palette browser and an untitled Xcos window. |
| 02:04 | Now we will make the Xcos diagram. |
| 02:06 | This will access the function squareit created just now. |
| 02:10 | This can be done by using scifunc block. |
| 02:14 | Switch to the palette browser window. |
| 02:17 | Click on the User-Defined function in the pallet browser. |
| 02:21 | Locate the block scifunc_block_m in this section. |
| 02:27 | Drag and drop it in untitled Xcos window. |
| 02:32 | I will zoom the untitled Xcos window for better view. |
| 02:36 | I will use the Zoom button as you see. |
| 02:40 | Now double click on the scifunc block to configure it. |
| 02:44 | A window named Scilab multiple values request will open. |
| 02:49 | This window will allow you to change the number of input and output ports of the scifunc block. |
| 02:56 | Our function squareit has only one input and output variable. |
| 03:00 | 'Hence, we will keep the settings unchanged. |
| 03:03 | Click on OK. |
| 03:05 | A new Scilab input value request window will open. |
| 03:09 | In the text box, type the function name along with input and output variables. |
| 03:14 | This function will be called by the scifunc block. |
| 03:18 | In the text box available, |
| 03:20 | edit the default function name. |
| 03:22 | Type y1 equal to squareit open bracket u1 close the bracket. |
| 03:31 | Note that, here the input and output variables are u1 and y1 respectively. |
| 03:37 | These should be strictly in u and y form and not as per the variable names used in the actual function. |
| 03:45 | Cick on OK. |
| 03:47 | Another Scilab input value request window will open. |
| 03:51 | Keep clicking on Ok in the subsequent 3 windows that will appear. |
| 03:56 | The scifunc block is now configured. |
| 04:00 | Next we will include a sinusoid generator block. |
| 04:04 | In the palette browser window, click on Sources section. |
| 04:08 | Drag and drop the Sinusoid Generator block in untitled Xcos window. |
| 04:14 | Place the block towards the left of the scifunc block for convenience. |
| 04:20 | Now we need a block to plot the output variable. |
| 04:23 | 'In the palette browser window, click on Sinks section. |
| 04:29 | Drag and drop the CScope block in the untitled Xcos window. |
| 04:34 | Place the block towards the right of the scifunc block. |
| 04:38 | Place it away from scifunc block, for convenience. |
| 04:43 | Notice that the CScope block has a red input port. |
| 04:47 | This is an event input. |
| 04:49 | we need an event generator block. |
| 04:52 | In the palette browser window, click on Sources section. |
| 04:57 | Drag and drop the clock underscore c block in the untitled Xcos window. |
| 05:05 | Place it above the CScope block. |
| 05:08 | Notice that the CScope block has only one input port. |
| 05:13 | But we want to plot both the input and output variables in a single plot window. |
| 05:18 | Hence, we need a multiplexer block. |
| 05:22 | This block will multiplex two inputs and generate output on one output port. |
| 05:28 | In the palette browser window, click on Signal Routing section. |
| 05:33 | Drag and drop the MUX block in the untitled Xcos window. |
| 05:39 | Place the block between the scifunc block and CScope block. |
| 05:43 | Let me resize and realign the Mux block |
| 05:47 | Now let us connect the blocks together. |
| 05:51 | Connect the output port of Sinusoid generator block to the input port of scifunc block |
| 05:57 | Now connect the output port of scifunc block to the lower input port of the MUX. |
| 06:04 | Connect the output port of MUX block to the input port of CScope block. |
| 06:10 | Connect the output port of clock underscore c block to the event input port of CScope block. |
| 06:19 | We also have to plot sine input. |
| 06:22 | We have to connect the Sinusoid generator block to the MUX. |
| 06:26 | Click on the upper input port of the MUX block. |
| 06:30 | Then without releasing, move your mouse pointer towards the link between the Sinusoid generator block and scifunc block. |
| 06:39 | To bend the link, release the mouse button or click at places. |
| 06:44 | As you bring the pointer on the link, the link turns green. |
| 06:49 | Release the mouse button or click once to create a link between these two blocks. |
| 06:55 | Now let us see the configuration of other blocks. |
| 06:59 | We can change the frequency, magnitude and phase of the sinusoid generator block. |
| 07:04 | To do this, double click on the Sinusoid generator block. |
| 07:09 | The configuration window will open. |
| 07:11 | We will keep the magnitude and frequency as 1 and phase as 0. |
| 07:18 | Click on Ok to close the configuration window. |
| 07:21 | Now let us configure the CScope block. |
| 07:25 | Double click on the CScope block to open its configuration window. |
| 07:30 | Change the Ymin parameter to minus 2 and Ymax parameter to 2. |
| 07:37 | Change the Refresh period value to 10. |
| 07:41 | Make a mental note of this value. |
| 07:44 | Change the buffer size value to 2 . |
| 07:47 | click on OK. |
| 07:50 | Now let us configure the CLOCK_c block. |
| 07:54 | Double click on the block to open its configuration window. |
| 07:58 | Keep the value of Period as 0.1 |
| 08:02 | Change the Initialisation Time to be 0. |
| 08:06 | Click on OK. |
| 08:08 | Now let us change the Simulation parameters. |
| 08:12 | On the menu bar of the untitled Xcos window click on the Simulation tab. |
| 08:17 | Now click on Setup from the drop down menu. |
| 08:22 | Change the Final Integration time to match the Refresh period of CScope block. |
| 08:28 | The value of Refresh period was 10. |
| 08:32 | Hence, put the value of Final integration time as 10. |
| 08:36 | Click on OK. |
| 08:38 | Now, click on File and then click on Save to save the Xcos diagram. |
| 08:44 | Choose a desired directory to save the Xcos diagram. |
| 08:48 | However, it is advised to save it in the folder where you have saved the squareit.sci file. |
| 08:56 | Click on OK. |
| 08:58 | Note that the scifunc block will call the squareit function. |
| 09:02 | This means that we should first load the squareit function before we execute the xcos diagram. |
| 09:09 | Switch to the Scilab editor window, which has the squareit.sci file open. |
| 09:16 | Click on the Execute button available on the menu bar of the editor. |
| 09:21 | This will load the squareit function. |
| 09:24 | Now we can execute the Xcos diagram. |
| 09:28 | Open the Xcos diagram file. |
| 09:31 | Click on the Start button available on the menu bar of Xcos window. |
| 09:37 | A graphic window will appear. |
| 09:39 | This window will have two plots. |
| 09:42 | Input sine wave in black color and output sine wave in green color. |
| 09:47 | Notice that the squaring function implemented in the squareit function, has indeed squared the input sine wave. |
| 09:55 | Hence, the output sine wave has been shifted to the positive axis. |
| 10:00 | Close the plot window. |
| 10:02 | Now, let us see how to edit the scifunc block to call a function which has more than one input and output variables. |
| 10:10 | Switch to scilab editor window. |
| 10:13 | Edit the squareit function to have two input and output variables. |
| 10:19 | Edit the output variable as open square bracket y comma z close the square bracket . |
| 10:28 | Edit the input variables as open bracket a comma b close bracket. |
| 10:36 | We will change the function to shift the squared output by 1 unit. |
| 10:41 | Edit the main function line as |
| 10:44 | y is equal to b plus a raise to two put a semicolon in the end. |
| 10:51 | Also generate an output whose amplitude will be half of the input. |
| 10:56 | Go to next line by pressing enter key and type |
| 11:01 | z is equal to 0.5 multiplied by a put a semicolon in the end. |
| 11:10 | Now save the file. |
| 11:12 | switch to the xcos window. |
| 11:15 | Double click on the scifunc block to configure it. |
| 11:19 | In the input port size field, put a semi colon after 1 comma 1 and type 1 comma one again. |
| 11:27 | Similarly, in the output port size field, put a semi colon after 1 comma 1 and type 1 comma 1 again. |
| 11:36 | Click on OK. |
| 11:38 | A new Scilab input value request window will open. |
| 11:41 | In the text box, |
| 11:43 | put a comma after y1 and type y2, |
| 11:48 | put y1 and y2 in square brackets, |
| 11:52 | now put a comma after u1 and type u2. |
| 11:57 | Click on OK. |
| 11:59 | Another Scilab input value request window will open. |
| 12:03 | Keep clicking on Ok in the subsequent 3 windows that will appear. |
| 12:08 | The scifunc block is now configured. |
| 12:11 | Let me realign the scifunc block. |
| 12:14 | Switch to the palette browser window. |
| 12:17 | In the sources section, drag and drop the Constant underscore m block in the xcos window. |
| 12:24 | Place it below the sinusoid generator block. |
| 12:28 | Connect the Constant underscore m block to the lower input of the scifunc block. |
| 12:36 | The default value of this block is 1. |
| 12:39 | Keep it unchanged. |
| 12:41 | Double click on the MUX block. |
| 12:44 | Change the input port size to 3. |
| 12:47 | Click on OK. |
| 12:48 | Let me resize the MUX block and I will connect MUX and CSCOPE block properly. |
| 12:59 | Connect the lower output port of the scifunc block to the lower input port of MUX block. |
| 13:07 | Click on File and choose Save to save the xcos file. |
| 13:12 | Switch to the Scilab editor which has the squareit.sci file open. |
| 13:18 | Click on the Execute button available on the menu bar of the editor. |
| 13:23 | This will load the squareit function. |
| 13:26 | Now we can execute the Xcos diagram. |
| 13:30 | Click on the Start button available on the menu bar of the Xcos window. |
| 13:35 | A graphic window will appear. |
| 13:38 | This window will have three plots. |
| 13:40 | Input sine wave in black color, |
| 13:43 | output sine wave in green color and |
| 13:45 | amplitude scaled input in red colour. |
| 13:49 | Notice that the function has indeed squared the input sine wave and also shifted it by an offset of 1 unit, which is as expected. |
| 13:59 | We also get the amplitude scaled of the input sine wave, as expected. |
| 14:05 | Close the plot window. |
| 14:08 | Now let us summarize. |
| 14:10 | In this tutorial we learnt: |
| 14:12 | * To write a squaring function in Scilab |
| 14:15 | * To use the scifunc block in Xcos |
| 14:19 | * To use MUX block to draw multiple plots |
| 14:22 | * To call functions having multiple input and output. |
| 14:26 | Watch the video available at the following link. |
| 14:29 | It summarizes the Spoken Tutorial project. |
| 14:33 | If you do not have good bandwidth, you can download and watch it. |
| 14:37 | The spoken tutorial project Team: |
| 14:40 | Conducts workshops using spoken tutorials. |
| 14:43 | Gives certificates for those who pass an online test. |
| 14:47 | For more details, please write to contact@spoken-tutorial.org |
| 14:53 | Spoken Tutorial Project is a part of Talk to a Teacher project. |
| 14:57 | It is supported by the National Mission on Eduction through ICT, MHRD, Government of India. |
| 15:05 | More information on this mission is available at spoken-tutorial.org/NMEICT-Intro. |
| 15:15 | Thank you for joining .Hope you found this tutorial useful. |
| 15:19 | This is Anuradha Amruthkar from IIT Bombay, signing off. |
