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+//Example 5 Page 64
+clc
+clear
+//function for linear model
+function y=r1(t)
+y=57*t+607
+endfunction
+//function for quadratic model
+function y=r2(t)
+    y=-9*t^2+110*t+560
+endfunction
+//function for exponential model
+function y=r3(t)
+   y=608*(1.08)^t
+endfunction
+//function for logistic model
+function y=r4(t)
+    y=930/(1+0.67*(1.7)^-t)
+endfunction
+
+disp('a)')
+t=([0 1 2 3 4 5 6])//assigning values of t
+y1=r1(t)//function caling r1(t)
+disp(t)
+disp(y1)//displaying values of y1
+y2=r2(t)//function calling r2(t)
+disp(t)
+disp(y2)//displaying values of y2
+y3=r3(t)//function calling r3
+disp(t)
+disp(y3)//displaying value sof y3
+y4=r4(t)//function calling r4
+disp(y3)//displaying y4 values
+plot(6,1000,t,y1,'red')//plotting linear graph
+xtitle('Linear Model','x','y')//given title and other labes
+scf//setting current graphic window
+plot(6,1000,t,y2,'blue')//plotting qudratic graph
+xtitle('quadratic','x','y')//setting labels
+scf//setting current graphic window
+plot(6,1000,t,y3,'blue')//plotting exponential graph
+xtitle('Exponential Model','x','y')//setting labels
+scf//setting current graphic window 
+plot(6,1000,t,y2,'blue')//plotting logistic graph
+xtitle('Logistic Model','x','y')//setting labels
+
+disp('b)')
+t=10//assigning value of t
+y1=r2(t)//function calling r2
+disp(y1,'Quadratic Model for 2010')//displaying result
+y2=r4(t)//function calling r4
+disp(y2,'Logistic Model for 2010')//displaying result
+
+
+