If your data are regulary sampled along the y axis you can use the
sgolay filter
(http://en.wikipedia.org/wiki/Savitzky%E2%80%93Golay_filter">http://en.wikipedia.org/wiki/Savitzky-Golay_filter)otherwise
the loess regression
(http://cran.r-project.org/doc/contrib/Fox-Companion/appendix-nonparametric-regression.pdf)
may be tried .
Both methods and others like medianfilter , sdfilter, ... are available
in the CWA scilab module...
Serge Steer
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