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+clc;clear;
+//Example 18.5
+//calculation of resistivity
+
+//given values
+e=1.6*10^-19;
+ni=2.5*10^19;//intrinsic density of carriers per m^3
+ue=.39;//mobility of e 
+uh=.19;//mobility of hole
+
+
+//calculation
+c=e*ni*(ue+uh);//conductivity
+r=1/c;//resistivity
+disp(r,'resistivity in ohm m is');
+\ No newline at end of file