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+//Example 2 Page 47
+clc
+clear
+//defnining the function
+function y=n(t)
+if(t>0 | t<=3) then
+y=1.5*t^2-t+1.5;
+elseif(t>3 | t<=5) then
+y=46*t-126;
+end
+endfunction
+
+disp('jan.2005:')
+t=1;
+y=n(t)//calling function
+mprintf("the facebook memberships in the year 2005 are %d",y);//prinitng the value of the year 2005
+disp('jan.2007:')
+t=3;
+y=n(t)//calling function
+mprintf("the facebook memberships in the year 2007 are %d",y);//prinitng the value of the year 2007
+disp('jan.2008:')
+t=4.5;
+y=n(t)//calling function
+mprintf("the facebook memberships in the year 2005 are %d",y);//prinitng the value of the year 2008
+t=[0 1 2 3 ]//assigning values to t
+y=n(t)//finding the values of the function n(t)
+plot(t,y,'blue')//plotting on the graph
+t=([3 3.5 4 4.5 5])
+y=n(t)
+plot(t,y,'red')//plotting on the graph
+xtitle('Graph of n','Year','facebook members (in millions)');