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+//Example 3 Page 48

+clc

+clear

+//defining the function 

+function y=f(x)

+if(x >= -4 & x < -1) then//check value of x

+y=-1;

+elseif(x >= -1 & x <= 1) then//check value of x

+y=x;

+elseif(x > 1 & x <= 2) then//check value of x

+y=x^2-1;

+end

+endfunction

+

+disp('a)')

+x=-2;//assigning value to x

+y=f(x)//function calling

+disp(y)

+x=-1;//assigning value to x

+y=f(x)//function calling

+disp(y)

+x=0;//assigning value to x

+y=f(x)//function calling

+disp(y)

+x=1;//assigning value to x

+y=f(x)//function calling

+disp(y)

+x=2;//assigning value to x

+y=f(x)//function calling

+disp(y)

+

+disp('b)')

+x=[-4 -3 ]//assigning values to x

+y=f(x)//function calling

+disp(y)

+plot(4,4,x,y,'green')//plotting on graph

+x=[-1 0 1]//assigning values to x

+y=f(x)//function calling

+plot(4,4,x,y,'red')//plotting on graph

+x=[1.1 1.3 1.5 2]//assigning values to x

+y=f(x)//function calling

+plot(4,4,x,y,'blue')//plotting on graph

+xtitle('','x','y');