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

|Welcome to the spoken tutorial on Getting Started with Scilab.

| The use Scilab as a calculator.

| How to Store values in a variable.

| How to Perform various mathematical operations using these variables.

| How to Create a file to store commands executed during the session in the current working directory.

| How to define complex numbers.

| How to Perform exponential, logarithmic and trigonometric operations on numbers.

|The prerequisite for this tutorial are Scilab should be installed on your computer.

| I am using Scilab 5.2.0 and Mac OS/X  for demonstration

|Click on the Scilab shortcut icon on your Desktop and Start Scilab.

| Type 42 plus 4 multiplied by 4 minus 64 divided 4 and press enter.

| a equals 12, b=21 , c=33 and press enter.

| I will clear the scilab console using the clc command here

| a+b+c gives the result 66  

| b plus c  gives the result 648

| a,b,c,d and press enter

| I will clear the console here using the clc command

|Press ' shift key' and number key 6 to used this symbol.

|For finding the square root of a number, say, 17, we use : sqrt of 17

|34 raised to bracket  2 divide by 5  close the bracket and press Enter.

| Negative powers can also be used,

| Clear the cansole using clc command

| This will helps remember command which were previously issued along with the outputs.

| First type the command pwd and press Enter

|It might be different on your computer

|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.

| diary bracket, open inverted commas,  myrecord.txt  close inverted commas, close the bracket and press enter'''

| The imaginary unit i is defined in Scilab as percent i:

| For example,Five point two multiplied percent i gives 5.2i

| Now clear the console here,

| For example, percent pi.

| The value of pi is as expected.

|Now, we will demonstrate the use of pi using a few built-in trigonometric functions as follows.  

| For the functions sin of percent pi by 2 the result is 1

|''And for cos of percent pi by 2 the result is 6.123D-17.'''

| Notice that the second answer is zero for all practical purposes.  

| %eps is related to number known as "machine epsilon",

|Type % eps on your console to find its value on your computer.

| On my computer it gives 2.220D-16  

|While scilab variables and functions are case-sensitive, here we can use small d or capital D, or small e, or capital E.  

| percent e gives the result as expected.  

|We can achieve the same result with the function "e x p''.

| For example: exp bracket (1)'' close the bracket and press Enter

| You can see both the answers are same

|Clear the console using the clc command here.

|The command log means the natural logarithm of a number, that is, to the base e.  

| For example, log10 bracket 1e minus 23 close bracket  and press enter this gives the expected answer -23.

| We get complex numbers when taking logarithm of negative.  

|Now recall that we invoked a recording of all the typed commands into the file myrecord.txt through the diary command,

| For closing the file, type,

| diary of zero

|Let us open this file to do click on the a Open-a-file shortcut icon on your scilab console window toolbar.

| I will change the file format to all file

|Click yes.

|We know that, while a program is being developed, one experiments a lot with the code before arriving at suitable code.  

| If you recall that, we had closed the file my record.txt using the command diary of zero.

| Please , note that no transactions can be saved after executing this command.

|If the file contains some useful information, then one should use the some other file name in the diary command.

| Because, use of same file name will overwrite the existing file.

| For example, type “help chdir” on the scilab console and press enter.

| I will increase the size of the help browser.

| Help chdir gives detailed information on how to change the current working directory.

| Another option is to click on the help browser icon on the toolbar of the scilab console window as you see.

| Let me close the help browser and coming back to the slides.

| The up - down arrow keys can been used to see the previously executed commands.

|While using the up - down arrows, you can stop at any command,and press Enter to execute it.

| You can edit the commands, if necessary.

|Use tab key to auto-complete the commad. It gives us all the available options to choose.  

|Use of Scilab as a calculator .

| Store the result in the default variable ans.  

| Assign values to the variable using the equality sign.

| Check values in variables by typing the name of the variable separated by commas on the console.

| Check the current working directory using pwd command.

| Use diary command to save all commands typed on the console into a file.

| Define complex numbers, natural exponents and π using %i, %e and %pi respectively.  

| Use help command for detailed information about any command.

| This spoken tutorial has been created by the Free and Open Source Software in Science and Engineering Education(FOSSEE).  

| More information on the FOSSEE project could be obtained from http://fossee.in or http://scilab.in website  

| Supported by the National Mission on Eduction through ICT, MHRD, Government of India.  

| More information on this please visit spoken hyphen tutorial dot org slash NMEICT hyphen intro

| This is Anuradha Amrutkar from IIT Bombay signing off.