C. K. PITHAWaLA COLLEGE OF ENGINEERING AND TECHNOLOGY

NAME ROLL NO.

1.PRAJAPATI ABHAY 173

2.CHINTAN BHATT 128

3.RANA SRUSHTI 175

4.MARSONIYA HEM 148

5.AMAN PATEL 152

6.PATEL VEER 170

7.TARANG SAPRA 178

8.BHAVIK MISTRY 130

9.NOORANI ANAS 115(A)

10.PATEL KRUSHANI 183

•Scilab•History of scilab•Scilab and matlab •Plotting graphs•Comparison of graphs•Shifting of graphs

objectives

What is scilab ? Scilab is a programming language associated with a rich collection of numerical algorithms covering many aspects of scientific computing problems. Scilab is free and open source software for numerical computation providing a powerful computing environment for engineering and scientific applications.  Scilab consists of three main components :- •An interpreter•Libraries of functions (Scilab procedures)•Libraries of Fortran and C routines

Why scilab ?

Scilab is released as open source under the CeCILL license (GPL compatible), and is available for download free of charge. Scilab is available under GNU/Linux, Mac OS X and Windows XP/Vista/7/8 Scilab includes hundreds of mathematical functions. It has a high level programming language allowing access to advanced data structures, 2-D and 3-D graphical functions. 

For more information about scilab please visit this website :-

www.scilab.org

Scilab was created in 1990 by researchers from INRIA and ENPC.Scilab Consortium was formed in 2003, to broaden contributions and promote its use in academia and industry worldwide.Scilab adopted the CeCILL license in July 2004, which is compatible with the GNU GPL.In July 2008, Scilab Consortium joined Digiteo, a research cluster in Information Science & Technology.In June 2010, Scilab Consortium announced the formation of Scilab Enterprises to broaden contributions to Scilab and promote its use in academis and industry worldwide.

• Matlab has a thorough documentation; the one among them is Scilab.

• Matlab has a lot of optimization on computation , thus it is faster than Scilab.

• Matlab has a very powerful simulation component called “Simulink”.

• Scilab has Scicos that serves the same purpose but it is weaker .

• Matlab has a much better integration with other programming languages and programs such as C , C++ and Excel .

•The graphics components of Scilab is weak i.e. it has less functions .

•Most important and the key advantage of Scilab is that it can be easily available at FREE of cost . It certainly outweighs its deficiencies. It is remarked that Scilab is more than enough for casual and educational purposes.

In order to Plot, we need a set of points. Let us create a sequence of equally spaced points. This can be done by the linspace command which creates a linearly equally spaced vector

x is a row vector with 6 equally spaced points between -10 and 10.

x=linspace(-10,10,6) - 10. - 6. - 2. 2. 6. 10.

Example 1

1. x is a row vector with100 equally spaced points between -50 and 50.

‐‐> x=linspace(-50,50,100); In this example , in the bracket the first two digits which are -50 and 50

denotes the range of the function and 100 denotes that the range should be divided in the five equal parts. Which is like that

Similarly y is a row vector with 100 equally spaced points between -30 and 20.

‐‐> y=linspace(-30,20,100);  We will plot a graph with the arguments x and y using

the plot function. ‐‐> plot(x,y) creates a graph of x verses y as you see.

For plotting 2d graphs we take a example :-- 2. x is a row vector with 50 equally spaced points between 1 and 100.---> x=linspace(1,100,50); and y is a row vector with 50 eqally spaced points between -10 and 10. ---> y=linspace(-10,10,50); Now for the 2d graph the function is Plot2d(x,y,style=2)

plot2d command plot a graph of x verses y as you see.

Notice that there is a third argument called style and this argument is optional. It is used to customize the appearance of the plot.For positive values of style, the curve is a plain line with different colors, like dark blue is given 2 in our case. The default value of style is 1. For different negative and positive values, the appearance of the graph differs.

To configure labels to the axis and title of the plot we can use the commands --> title(“name of title") -->xlabel("X") X= name of x-axis -->ylabel("Y") Y= name of y-axis You will see that the graph has been labeled X to the x axis, Y to the y axis and title of the graph is name of title.

DIFFERENT STYLES :- Style 1 :- Black Style 2 :- Dark Blue Style 3 :- Green Style 4 :- Light Blue Style 5 :- Red Style 6:- Pink Style 7 :- Yellow Style 8 :- White Style 9 :- Blackish Blue Similarly, value of Style can be

given as negative values but in that instead of color it will give different types of symbols .

If we take negative value of style then the graph is like that :-

CLF AND CLEAR COMMANDS:-The clf() function will clear the graphic window.‐‐> clf()It is useful while plotting different graph on the same graphic window.

While ,the clear command is used to clear the display i.e. it will clear the values of x and y displayed on the screen.

COMPARESION OF TWO DIFFERENT GRAPHSFor example,

‐‐> x=linspace(-15,15,80);‐‐> y1=x^5;

Note that here ‘^’ symbol is denoted for power

Then, y2=x^4;

-->plot(x,y1, style=4)---------------------(1)-->plot(x,y2,style=6)----------------------(2)

Now you can see the graphs below respectively.

SHIFTING OF GRAPHNow, taking example we can present shifting of graphs x=linspace(-7,7,60); y1=x^2; y2=(x-3)^2; plot2d(x,y1,style=7)--------------(1) plot2d(x,y2,style=6)---------------(2)

THANK YOU