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====== Noise Simulation - Version 5 ====== To add noise to a simulated pattern (e.g. use the "simulate pattern from cif" command in jEdit menus you can use the function Rand_Normal(Mean, Std_Deviation); for example: xdd_out FILE load out_record out_fmt out_eqn { " %11.6f " = X; " %11.6f\n" = Rand_Normal(Ycalc, Sqrt(Ycalc)); } To test Rand_Normal then try: iters 0 yobs_eqn = 100; min 0.001 max 100 del .001 xdd_out aac.txt load out_record out_fmt out_eqn { " %11.6f\n" = Abs(Rand_Normal(0, 1)); } The data in AAC.TXT should obey the following: Sqrt[ Sum(AAC.TXT)^2 / 100000 ] = 1