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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');