fit_ratf - tpcclib 0.7.3 © 2019 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