Difference between revisions of "Scilab/C2/Getting-Started/English-timed"

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|00:09
 
|00:09
  
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| The use of Scilab as a calculator.
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|* The use of Scilab as a calculator.
  
 
|-
 
|-
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|00:12
 
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| How to store values in a variable.
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|* How to store values in a variable.
  
 
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|00:15
 
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| How to perform various mathematical operations using these variables.
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|* How to perform various mathematical operations using these variables.
  
 
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|00:21
 
|00:21
  
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| How to create a file, to store commands executed during the session, in the current working directory.
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|* How to create a file, to store commands executed during the session, in the current working directory.
  
 
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|-
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|00:29
 
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| How to define complex numbers.
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|* How to define complex numbers.
  
 
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|00:31
 
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| How to perform exponential, logarithmic and trigonometric operations on numbers.
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|* How to perform exponential, logarithmic and trigonometric operations on numbers.
  
 
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|Press ' Shift key' and number key 6 to use this symbol.
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|Press 'Shift key' and number key 6 to use this symbol.
  
 
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|For finding the square root of a number, say, 17, we use : '''sqrt''' of 17
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|For finding the square root of a number, say, 17, we use : '''sqrt''' of 17.
  
 
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|-
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| For example, '''percent pi'''.
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| For example, '''percent pi''' (%pi).
  
 
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|Type '''% eps''' on your console to find its value on your computer.
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|Type '''%eps''' on your console to find its value on your computer.
  
 
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|-
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| On my computer it gives 2.220D-16  
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| On my computer it gives 2.220D-16.
  
 
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|09:06
 
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|While scilab variables and functions are case-sensitive, here we can use small d or capital D, or small e, or capital E.  
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|While scilab variables and functions are case-sensitive, here we can use small d or capital D, small e or capital E.  
  
 
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| percent e gives the result as expected.  
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| '''percent e''' (%e) gives the result as expected.  
  
 
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|We can achieve the same result with the function "e x p''.
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|We can achieve the same result with the function "e x p".
  
 
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|-
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| For example: exp bracket (1)'' close the bracket and press Enter
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| For example: exp bracket 1 close the bracket and press Enter.
  
 
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|-
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| You can see both the answers are same
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| You can see both the answers are same.
  
 
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|Clear the console using the clc command here.
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|Clear the console using the '''clc''' command here.
  
 
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|-
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|The command log means the natural logarithm of a number, that is, to the base e.  
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|The command '''log''' means the natural logarithm of a number, that is, to the base e.  
  
 
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|-
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| For example, log10 bracket 1e minus 23 close bracket  and press enter this gives the expected answer -23.
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| For example, log10 bracket 1e minus 23 close bracket  and press Enter, this gives the expected answer -23.
  
 
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|-
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| We get complex numbers when taking logarithm of negative.  
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| We get complex numbers when taking logarithm of negative .  
  
 
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|Now recall that we invoked a recording of all the typed commands into the file myrecord.txt through the diary command,
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|Now recall that we invoked a recording of all the typed commands into the file myrecord.txt through the diary command.
  
 
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|-
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| For closing the file, type,
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| For closing the file, type
  
 
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| diary of zero
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| '''diary of zero'''.
  
 
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|Let us open this file to do click on the a Open-a-file shortcut icon on your scilab console window toolbar.
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|Let us open this file. To do so, click on the '''Open-a-file''' shortcut icon on your scilab console window toolbar.
  
 
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| I will change the file format to all file
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| I will change the file format to '''All Files'''.
  
 
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|Click yes.
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|Click '''Yes'''.
  
 
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|We know that, while a program is being developed, one experiments a lot with the code before arriving at suitable code.  
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|We know that while a program is being developed, one experiments a lot with the code before arriving at suitable code.  
  
 
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| If you recall that, we had closed the file my record.txt using the command diary of zero.
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| If you recall that we had closed the file my record.txt using the command '''diary of zero'''
  
 
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| Please , note that no transactions can be saved after executing this command.
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| please note that no transactions can be saved after executing this command.
  
 
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|If the file contains some useful information, then one should use the some other file name in the diary command.
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|If the file contains some useful information, then one should use some other file name in the diary command.
  
 
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| Because use of same file name will overwrite the existing file.
  
 
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| For example, type “help chdir” on the scilab console and press enter.
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| For example, type “help chdir” on the scilab console and press Enter.
  
 
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| I will increase the size of the help browser.
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| I will increase the size of the '''Help Browser'''.
  
 
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| Help chdir gives detailed information on how to change the current working directory.
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| '''Help chdir''' gives detailed information on how to change the current working directory.
  
 
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| Another option is to click on the help browser icon on the toolbar of the scilab console window as you see.
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| Another option is to click on the Help Browser icon on the toolbar of the scilab console window as you see.
  
 
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| Let me close the help browser and coming back to the slides.
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| Let me close the Help Browser and coming back to the slides.
  
 
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| The up - down arrow keys can been used to see the previously executed commands.
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| The up - down arrow keys can be used to see the previously executed commands.
  
 
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|While using the up - down arrows, you can stop at any command,and press Enter to execute it.
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|While using the up - down arrows, you can stop at any command and press Enter to execute it.
  
 
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| You can edit the commands if necessary.
  
 
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|Use tab key to auto-complete the commad. It gives us all the available options to choose.  
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|Use tab key to auto-complete the command. It gives us all the available options to choose.  
  
 
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|Use of Scilab as a calculator .
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|* Use of Scilab as a calculator .
  
 
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| Store the result in the default variable ans.  
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|* Store the result in the default variable ans.  
  
 
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| Assign values to the variable using the equality sign.
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|* Assign values to the variable using the equality sign.
  
 
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| Check values in variables by typing the name of the variable separated by commas on the console.
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|* Check values in variables by typing the name of the variable separated by commas on the console.
  
 
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| Check the current working directory using pwd command.
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|* Check the current working directory using pwd command.
  
 
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| Use diary command to save all commands typed on the console into a file.
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|* Use diary command to save all commands typed on the console into a file.
  
 
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| Define complex numbers, natural exponents and π using %i, %e and %pi respectively.  
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|* Define complex numbers, natural exponents and π using %i, %e and %pi respectively.  
  
 
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| Use help command for detailed information about any command.
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|* Use help command for detailed information about any command.
  
 
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| This spoken tutorial has been created by the Free and Open Source Software in Science and Engineering Education(FOSSEE).  
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| This spoken tutorial has been: created by the Free and Open Source Software in Science and Engineering Education(FOSSEE).  
  
 
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| More information on the FOSSEE project could be obtained from http://fossee.in or http://scilab.in website  
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| More information on the FOSSEE project could be obtained from http://fossee.in or http://scilab.in website.
  
 
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| Supported by the National Mission on Eduction through ICT, MHRD, Government of India.  
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| Supported by the National Mission on Eduction through ICT, MHRD, Government of India.  
  
 
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| More information on this please visit spoken hyphen tutorial dot org slash NMEICT hyphen intro
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| For More information on this, please visit spoken hyphen tutorial dot org slash NMEICT hyphen intro.
  
 
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|16:48
  
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| This is Anuradha Amrutkar from IIT Bombay signing off.
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| This is Anuradha Amrutkar from IIT Bombay, signing off.

Latest revision as of 09:27, 19 February 2015

Time Narration
00:02 Welcome to the spoken tutorial on Getting Started with Scilab.
00:07 In this tutorial we are going to learn:
00:09 * The use of Scilab as a calculator.
00:12 * How to store values in a variable.
00:15 * How to perform various mathematical operations using these variables.
00:21 * How to create a file, to store commands executed during the session, in the current working directory.
00:29 * How to define complex numbers.
00:31 * How to perform exponential, logarithmic and trigonometric operations on numbers.
00:38 The prerequisite for this tutorial is- Scilab should be installed on your computer.
00:44 I am using Scilab 5.2.0 and Mac OS/X for demonstration.
00:51 Here is the Flow chart for the tutorial.
00:55 Click on the Scilab shortcut icon on your Desktop and Start Scilab.
01:01 This is the Scilab console window. Notice that the cursor is on the command prompt.
01:07 I suggest that you practice this tutorial in Scilab simultaneously while pausing the video at regular intervals of time.
01:16 Scilab can be used as a calculator.
01:19 Let us see some of the basic operations that it can do.
01:25 Type 42 plus 4 multiplied by 4 minus 64 divided by 4 and press Enter.
01:36 The output is 42, as expected.
01:39 Note that the answer 42 is stored in the default variable "a n s".
01:45 We can also create named variables: Type,
01:49 a equals 12, b=21 , c=33 and press Enter.
02:00 This stores the values 12, 21 and 33 in the variables a, b and c respectively.
02:08 I will clear the scilab console using the clc command here.
02:13 Now we will perform some mathematical operations using these variables.
02:19 For example,
02:21 a+b+c gives the result 66;
02:27 also
02:29 a times into bracket
02:35 b plus c gives the result 648.
02:41 We can also assign the answer to another variable say 'd' by typing d = bracket a+b close the bracket multiplied by c gives the answer
02:58 d = 1089.
03:01 We can check the values in the variables by typing the names of the variables separated by commas on the command line as
03:09 a,b,c,d and press Enter.
03:16 I will clear the console here using the clc command.
03:21 To take the power, use the “raised to” symbol which is located on the number key 6 of your keyboard.
03:29 Press 'Shift key' and number key 6 to use this symbol.
03:34 for example, 7 square can be found by 7 raised to 2 and press Enter.
03:43 For finding the square root of a number, say, 17, we use : sqrt of 17.
03:55 This is same as 17 raised to the power of zero point five.
04:06 By convention, only the positive value comes as output.
04:10 More generally, to find 34 to the power of (2 by 5), type:
04:15 34 raised to bracket 2 divided by 5 close the bracket and press Enter.
04:25 Negative powers can also be used.
04:28 Clear the cansole using clc command.
04:33 So far, you have seen how to do some simple calculations and how to create variables in Scilab.
04:40 Now let us start with the new command.
04:43 This will help remember commands which were previously issued along with the outputs.
04:49 First, type the command pwd and press Enter.
04:55 This is the current working directory (on my computer).
04:58 It might be different on your computer.
05:01 The current working directory can be changed by clicking the changed current directory icon, located on the toolbar of the scilab console window as you see.
05:15 Now issue the diary command by typing:
05:20 diary bracket, open inverted commas, myrecord.txt close inverted commas, close the bracket and press Enter.
05:40 This command will create a file with the name "myrecord.txt" in the current working directory.
05:48 A transcript of the Scilab session from now onwards will be saved in this file.
05:53 Its usefulness will be demonstrated at a later stage in this tutorial.
06:00 Please pause the tutorial now and attempt exercise number one given with the video.
06:07 Now, let us see how Scilab handles complex numbers.
06:13 The imaginary unit i is defined in Scilab as percent i:
06:18 For example,Five point two multiplied percent i gives 5.2i;
06:29 also bracket 10 plus 5 into percent i whole multiply by 2 times percent i gives the result -10. + 20.i
06:58 Now clear the console here.
07:04 Let us see some other predefined numerical constants available in Scilab.
07:09 As with i, their names also start with the percent sign:
07:13 For example, percent pi (%pi).
07:18 The value of pi is as expected.
07:21 Now, we will demonstrate the use of pi using a few built-in trigonometric functions as follows.
07:27 For the functions sine of percent pi by 2 the result is 1.
07:37 And for cos of percent pi by 2 the result is 6.123D-17.
07:50 Please note that the angles are measured in radians and
07:54 notice that the second answer is zero for all practical purposes.
07:59 %eps is related to number known as "machine epsilon",
08:03 It is the minimum digit resolution that Scilab can give.
08:08 Type %eps on your console to find its value on your computer.
08:19 On my computer it gives 2.220D-16.
08:24 This shows the floating point precision used by Scilab .
08:28 This number is a notation for 2.22 times 10^(-16). Clear the console here.
08:41 If one wants to write 0.000456, one can write it as 4.56d-4 or 4.56e-4.
09:06 While scilab variables and functions are case-sensitive, here we can use small d or capital D, small e or capital E.
09:16 The base of the natural logarithm is another important predefined numerical constant:
09:22 percent e (%e) gives the result as expected.
09:30 We can achieve the same result with the function "e x p".
09:35 For example: exp bracket 1 close the bracket and press Enter.
09:44 You can see both the answers are same.
09:47 Clear the console using the clc command here.
09:55 similarly,
09:56  %e square gives the following answer
10:04 which can also be achieved by typing exp of 2 .
10:18 The command log means the natural logarithm of a number, that is, to the base e.
10:23 Use log 10 for taking the logarithm with respect to base 10.
10:29 For example, log10 bracket 1e minus 23 close bracket and press Enter, this gives the expected answer -23.
10:47 We get complex numbers when taking logarithm of negative .
10:51 For complex numbers you can check this for yourself type : log of -1 or log of %i on your scilab console.
11:01 Now recall that we invoked a recording of all the typed commands into the file myrecord.txt through the diary command.
11:09 Now, let's see how to close that file and view it.
11:13 For closing the file, type
11:16 diary of zero.
11:21 This command will close and save the file myrecord.txt.
11:26 Also recall that this file was created in current working directory, which in my case is desktop.
11:34 Let us open this file. To do so, click on the Open-a-file shortcut icon on your scilab console window toolbar.
11:46 I will change the file format to All Files.
11:51 Select the file myrecord.txt and click on Open.
11:59 Note that all transactions, both commands and the corresponding answers given by Scilab, have been saved into this file.
12:10 I will close this file.
12:15 Click Yes.
12:21 We know that while a program is being developed, one experiments a lot with the code before arriving at suitable code.
12:29 Diary command helps to keep track of all the transactions.
12:35 If you recall that we had closed the file my record.txt using the command diary of zero
12:42 please note that no transactions can be saved after executing this command.
12:48 If we need to save the session once again, we need to issue the diary command again.
12:54 If the file contains some useful information, then one should use some other file name in the diary command.
13:03 Because use of same file name will overwrite the existing file.
13:09 Pause the video here and solve the second exercise given with the video.
13:15 You may have noticed that the solution for the problem was not exactly zero.
13:21 For more information on how to deal with this, type “help clean”.
13:27 In general, if you need help about a particular command, then the 'help' or help with an argument command can be used.
13:37 For example, type “help chdir” on the scilab console and press Enter.
13:53 I will increase the size of the Help Browser.
14:01 Help chdir gives detailed information on how to change the current working directory.
14:10 Another option is to click on the Help Browser icon on the toolbar of the scilab console window as you see.
14:20 Let me close the Help Browser and coming back to the slides.
14:31 The up - down arrow keys can be used to see the previously executed commands.
14:36 While using the up - down arrows, you can stop at any command and press Enter to execute it.
14:45 You can edit the commands if necessary.
14:48 In fact, you are looking for a previous command you typed, which started with the letter 'e', then type e, and then use up arrow key.
14:59 Use tab key to auto-complete the command. It gives us all the available options to choose.
15:07 In this tutorial we have learnt :
15:10 * Use of Scilab as a calculator .
15:12 * Store the result in the default variable ans.
15:16 * Assign values to the variable using the equality sign.
15:20 * Check values in variables by typing the name of the variable separated by commas on the console.
15:28 * Check the current working directory using pwd command.
15:34 * Use diary command to save all commands typed on the console into a file.
15:40 * Define complex numbers, natural exponents and π using %i, %e and %pi respectively.
15:49 * Use help command for detailed information about any command.
15:54 This brings us to the end of this spoken tutorial on Getting Started with Scilab.
15:59 There are many other functions in Scilab which will be covered in other spoken tutorials.
16:06 This spoken tutorial has been: created by the Free and Open Source Software in Science and Engineering Education(FOSSEE).
16:14 More information on the FOSSEE project could be obtained from http://fossee.in or http://scilab.in website.
16:22 Supported by the National Mission on Eduction through ICT, MHRD, Government of India.
16:29 For More information on this, please visit spoken hyphen tutorial dot org slash NMEICT hyphen intro.
16:43 I hope you find this spoken tutorial useful for learning.
16:47 Thank you.
16:48 This is Anuradha Amrutkar from IIT Bombay, signing off.

Contributors and Content Editors

Gaurav, Jyotisolanki, Krupali, PoojaMoolya, Sandhya.np14, Sneha

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