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thanks all
but i have a problem yet
could any one please tell me the below codes of wave propagation refer to wich formula?
CNA = 1.0 - SIG*DT/(2.*E0*ER)
CD = 1.0 + SIG*DT/(2.*E0*ER)
CA = CNA/CD
CNB = DT/(E0*ER*DZ)
CB = CNB/CD;
Ex(1,I) = CA*Ex(1,I) - CB*(Hy(1,I+1) - Hy(1,I))
thanks