## fit_ratf - tpcclib 0.7.8 © 2022 by Turku PET Centre

Non-linear fitting of 1st-3rd degree rational function to PET plasma and
tissue time-activity curves (TACs).
Function:
p1 + p3*x + p5*x^2 + p7*x^3
f(x) = ---------------------------
p2 + p4*x + p6*x^2 + p8*x^3
, where p1=0 and p2=1.
Usage: fit_ratf [Options] tacfile fitfile
Options:
-w1
All weights are set to 1.0 (no weighting); by default, weights in
data file are used, if available.
-wf
Weight by sampling interval.
-svg=<Filename>
Fitted and measured TACs are plotted in specified SVG file.
-h, --help
Display usage information on standard output and exit.
-v, --version
Display version and compile information on standard output and exit.
-d[n], --debug[=n], --verbose[=n]
Set the level (n) of debugging messages and listings.
-q, --quiet
Suppress displaying normal results on standard output.
-s, --silent
Suppress displaying anything except errors.
Options for selecting the rational function:
-p3p3 3rd degree polynomial/3rd degree polynomial (default)
-p3p2 3rd degree polynomial/2nd degree polynomial
-p2p2 2nd degree polynomial/2nd degree polynomial
-p2p1 2nd degree polynomial/1st degree polynomial
-p1p1 1st degree polynomial/1st degree polynomial
Program writes the fit start and end times, nr of points, WSS,
and parameters (p1, p2, ...) of the fitted function to the fit file.
See also: fit2dat, fit_exp, fit_sigm, fit_ppf
Keywords: curve fitting, TAC, simulation, rational function