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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