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# trunk/src/green/grepg
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(XXX macro: "PageOutline")
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Navigation: [[Mainpage], [wiki:trunk], [wiki:branches], [wiki:tags], [wiki:vendor], [wiki:export], [wiki:admin], [wiki:docs|WikiStart]]
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## Location
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**grepg** is located at [source:trunk/src/green/grepg].
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## Purpose
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* plot amplitudes and (optionally) phase of Fourier-Bessel coefficients (produced by [[greda], [wiki:trunk/src/green/synt/syg syg|trunk/src/green/disan/greda]], or flgevas
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* plot amplitudes of spectrograms (produced by [[gabor|trunk/src/green/disan/gabor.f]])
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* plot resolution analysis (produced by [[grereso|trunk/src/green/disan/grereso.f]])
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* plot taper files for [[gremlin] (produced by [wiki:trunk/src/green/tools/gretap.f gretap|trunk/src/green/gremlin1]])
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## Features
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* data modification options (normalize data, scaling)
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* plot resolution marks according to a geophone-trace-stepwidth of dx and a total length of the geophone-line
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* plot dispersion curves together with expansion coefficients
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* graphics output is done through [[PGPLOT|docs/PGPLOT]] featuring a variety of devices and graphics formats (including Postscript, X11, Tektronix, PNG, GIF, etc)
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* ...
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## Inline help
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mscha@gpiag12:~> grepg
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GREPG V2.40 plot Fourier-Bessel coefficients
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Usage: grepg filename [[dev] [-i] [-c] [-r L,dx] [-R|I] [-L|-d]]
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[[[-p p] [-g] [-l width] [-s] [-P] [-S|-q]]]
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[[lim] [-G file] [-H ch] [-F file] [-v|-m]]
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[[c,w] [-T title] [-X label] [-Y label] [-W|-N]]
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[[value] [-A label] [-M lim] [-C] [-B label|-n]]
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[[i,m,s] [-a a,g] [-f n] [-t n,m] [-Q] [-e lim|-O]]
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[[o,t] [-b width] [-x R,G,B] [-y R,G,B] [-h|-K]]
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[[r,g,b,w] [-Ah h] [-t n,m] [-Ta anno|-Fc]]
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[[n] [-Fl n] [-Pr] [-Ww w|-FC]]
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[[filename] [-st|-ff]]
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or: grepg -help
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STOP ERROR: missing arguments
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