On Fri, 17 Nov 2006, Loïc Le Guyader wrote:
If I look at example given, like this one http://ab-initio.mit.edu/wiki/index.php/Meep_Tutorial we use the same fcen and df for the source and the computation of the spectum.But if I plot the spectrum of the source, like show in attachement, I wonder how result for the frequency with low power can be accurate.
You're correct that if you look *very* far out along the tails of the gaussian pulse, it's no longer accurate because of numerical precision problems.
However, if you just use the same fcen and df, you aren't looking far out in the tails - you're looking within a standard deviation or two, which should be well within the limits of the numerical precision.
Steven
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