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+// Dynamic resistance in forward,reverse direction
+// Basic Electronics
+// By Debashis De
+// First Edition, 2010
+// Dorling Kindersley Pvt. Ltd. India
+// Example 2-26 in page 103
+
+clear; clc; close;
+
+// Given data
+T=398; // Temperature in K
+I_0=80*10^-6; // Current in micro A
+eta=1; // Constant
+V_F=[-0.2 0.2]; // Forward voltages in Volts
+V_T=0.0343; // Thermal voltage in volts
+
+// Calculation
+alp=[1 2];
+for i=1:2
+    R_ac=(V_T/I_0)*exp(V_F(i)/V_T);
+    printf("(%0.0f)Dynamic resistance = %0.3e ohm\n",alp(i),R_ac);
+end
+
+// Result
+// (a) Dynamic resistance in forward direction = 1.258 ohm
+// (b) Dynamic resistance in reverse direction = 0.146 Mohm
+\ No newline at end of file