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trend2d.ou
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1996-09-25
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GMT Warning: Could not determine home directory!
trend2d 3.0a:OS/2 - Fit a [weighted] [robust] polynomial for z = f(x,y) to ascii xyz[w]
usage: trend2d -N<n_model>[r] [<xyz[w]file>] [-F<xymrw>] [-C<condition_#>] [-I[<confidence>]] [-V] [-W]
-N<n_model>[r] fit a [robust] model with <n_model> terms. <n_model> in [1,10]. E.g., robust quadratic = -N3r.
OPTIONS:
[<xyz[w]file>] name of ascii file, first 2 cols = x y [3 cols = x y w]. [Default reads stdin].
-F<xymrw> Choose at least 1, up to 6, any order, of xyzmrw for ascii output to stdout.
x=x, y=y, z=z, m=model, r=residual=z-m, w=weight. w determined iteratively if robust fit used.
-C Truncate eigenvalue spectrum so matrix has <condition_#>. [Default = 1.0e06].
-I Iteratively Increase # model parameters, to a max of <n_model> so long as the
reduction in variance is significant at the <confidence> level.
Give -I without a number to default to 0.51 confidence level.
-V Verbose operation. Program reports progress to stderr.
-W Weighted input given, weights in 4th column. [Default is unweighted].