Module functions to retrieve the value and statistic arrays from the most recent run of a parameter estimation method
Struct_Type get_regunc()
Struct_Type get_regproj()
Error Return Value: NULL
These functions retrieve information from the most recent run of the
INTERVAL-UNCERTAINTY or
run_intunc, and
INTERVAL-PROJECTION or
run_intproj
parameter estimation methods, respectively.
Each returns a structure with seven fields:
- x0: the grid of values for one parameter;
- x1: the grid of values for the second parameter;
- y: the statistics as a function of parameter values;
- levels: an array containing the statistic valuecorresponding to each contour;
- name: a two-element array listing the parameter names;
- bfit: a two-element array listing the best-fit values of the parameters; and
- config: a Struct_Type variable containing the parameters used to calculate x0, x1, and y.
Fit a dataset; get information about chi-square
as a function of power-law amplitude p.ampl and
slope p.gamma
sherpa> DATA spec.dat
sherpa> PARAMPROMPT OFF
sherpa> POLY[p]
sherpa> THAW p.c1 p.c2 p.c3
sherpa> SOURCE = p
sherpa> FIT
LVMQT: V2.0
LVMQT: initial statistic value = 82.2297
LVMQT: final statistic value = 62.2247 at iteration 3
p.c0 61.4774
p.c1 -0.380228
p.c2 0.00993229
p.c3 -7.01741e-05
sherpa> REGPROJ p.c0 p.c1
Region-Projection: computing grid size with covariance...done.
outer grid loop 20% done...
outer grid loop 40% done...
outer grid loop 60% done...
outer grid loop 80% done...
Minimum: 62.2247
Levels are: 64.5207 68.4057 74.0547
[...plot displayed...]
sherpa> regproj = get_regproj()
sherpa> print(regproj)
x0 = Float_Type[100]
x1 = Float_Type[100]
y = Float_Type[100]
levels = Float_Type[3]
name = String_Type[2]
bfit = Double_Type[2]
config = sherpa_VisParEst_State
The structures returned by these functions contain additional fields - levels, name, bfit, and config - which are described above.
- sherpa
-
berrors,
bsyserrors,
compute_errors,
compute_statistic,
covariance,
errors,
ftest,
get_paramest,
get_paramestint,
get_paramestlim,
goodness,
interval-projection,
interval-uncertainty,
list_paramest,
mlr,
projection,
region-projection,
region-uncertainty,
restore_paramest,
run_paramest,
run_paramestint,
run_paramestlim,
run_paramestreg,
set_errors,
set_syserrors,
staterrors,
syserrors,
uncertainty
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