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+//chapter 8
+//example 8.1
+//page 229
+clear all;
+clc ;
+//from drain characteristics of FET
+Vgs=[0 -1 -2 -3 -4.5];//gate to source voltage in volts
+Id=[9 5.4 2.8 0.9 0];//drain current in mA
+plot(Vgs,Id,'colo','red','marker','*','markeredg','blue','markersize',10)
+xtitle('FET transfer characteristics','gate to source voltage in volts','drain current in mA')
+replot([-5 ,0,1,10])