Non-linear fitting of the sum of 1-5 exponential functions to decaying time-activity curve (TAC). Function: f(x) = a1*exp(k1*x) + a2*exp(k2*x) + a3*exp(k3*x) + ... , where a's > 0 and k's < 0. Usage: fit_dexp [Options] tacfile [parfile] Options: -5 | -4 | -3 | -2 | -1 | -1BL Fit to sum of specified number of exponential functions, or monoexponential with baseline; by default determined automatically. -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. -nr=<value> Number of basis functions, used in determination of initial parameter estimates and number of exponentials for nonlinear fitting; default is 100. -peak | -peak1 Fit is started only at the TAC peak, or at the next sample after peak. -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. If TAC file contains more than one TAC, only the first is used. Function parameters are written in fit format. See also: extrapol, fit_exp, fit_fexp, fit2dat, fit2auc, paucinf, tacln Keywords: TAC, curve fitting, extrapolation

This program comes with ABSOLUTELY NO WARRANTY. This is free software, and you are welcome

to redistribute it under GNU General Public License.

Source codes are available in https://gitlab.utu.fi/vesoik/tpcclib.git.