|
|
A 1-D TCD-model-based instrument model.
TPSF1D is a model-based instrument model. It
utilizes the predefined Gaussian, box, and top hat functions of the
TCD library.
Note that Top Hat function cannot be used in version 3.2
The convolution can be performed using either Fast Fourier Transforms
(FFTs, the default), or the sliding cell technique (see the parameter
fft). If the axis length is N and
the length of the kernel axis is M (= 2 * xsize + 1), then the computation time for the
sliding cell goes as N * M, i.e. for
large kernels the best choice is using the FFT. A rough rule-of-thumb
for 1-D fits is to use the FFT if M > 10.
In Sherpa version 3.0.2, a new parameter is introduced:
radial. If set to 1 the kernel array will be extended
and its values reflected across the edge boundary. The resultant
function will be symmetric. The default value (set to 0) should be used
in version 3.2.
See the documentation on the
INSTRUMENT command.
TPSF1D Parameters
| 1 | xsize | x-axis kernel width (pixels) |
| 2 | nsigma | sigma kernel width (Gaussian only) |
| 3 | funcTyp | Gaussian (1) / box (2) / top-hat (3) |
| 4 | fft | convolution type: 1 = FFT / 0 = sliding cell |
| 5 | radial | radial profile: 1 = yes / 0 = no |
This example illustrate the definition of the TPSF1D model.
sherpa> tpsf1d[t1]
sherpa> show t1
tpsf1d[t1]
Param Type Value Min Max Units
----- ---- ----- --- --- -----
1 xsize frozen 4 1 1024
2 nsigma frozen 2 1e-02 100
3funcTyp frozen 1 0 7
4 fft frozen 1 0 1
5 radial frozen 0 0 1
The Function Type is: Gaussian.
The parameter funcTyp in t1 model indicate
that the Gaussian function will be used. The 1 sigma width of the
Gaussian is set to xsize=4 bins and the total size of the
Gaussian kernel is set to 2 sigma.
- sherpa
-
atten,
bbody,
bbodyfreq,
beta1d,
beta2d,
box1d,
box2d,
bpl1d,
const1d,
const2d,
cos,
delta1d,
delta2d,
dered,
devaucouleurs,
edge,
erf,
erfc,
farf,
farf2d,
fpsf,
fpsf1d,
frmf,
gauss1d,
gauss2d,
gridmodel,
hubble,
jdpileup,
linebroad,
lorentz1d,
lorentz2d,
models,
nbeta,
ngauss1d,
poisson,
polynom1d,
polynom2d,
powlaw1d,
ptsrc1d,
ptsrc2d,
rsp,
rsp2d,
schechter,
shexp,
shexp10,
shlog10,
shloge,
sin,
sqrt,
stephi1d,
steplo1d,
tan,
tpsf,
usermodel,
xs,
xsabsori,
xsacisabs,
xsapec,
xsbapec,
xsbbody,
xsbbodyrad,
xsbexrav,
xsbexriv,
xsbknpower,
xsbmc,
xsbremss,
xsbvapec,
xsc6mekl,
xsc6pmekl,
xsc6pvmkl,
xsc6vmekl,
xscabs,
xscemekl,
xscevmkl,
xscflow,
xscompbb,
xscompls,
xscompst,
xscomptt,
xsconstant,
xscutoffpl,
xscyclabs,
xsdisk,
xsdiskbb,
xsdiskline,
xsdiskm,
xsdisko,
xsdiskpn,
xsdust,
xsedge,
xsequil,
xsexpabs,
xsexpdec,
xsexpfac,
xsgabs,
xsgaussian,
xsgnei,
xsgrad,
xsgrbm,
xshighecut,
xshrefl,
xslaor,
xslorentz,
xsmeka,
xsmekal,
xsmkcflow,
xsnei,
xsnotch,
xsnpshock,
xsnsa,
xsnteea,
xspcfabs,
xspegpwrlw,
xspexrav,
xspexriv,
xsphabs,
xsplabs,
xsplcabs,
xsposm,
xspowerlaw,
xspshock,
xspwab,
xsraymond,
xsredden,
xsredge,
xsrefsch,
xssedov,
xssmedge,
xsspline,
xssrcut,
xssresc,
xssssice,
xsstep,
xstbabs,
xstbgrain,
xstbvarabs,
xsuvred,
xsvapec,
xsvarabs,
xsvbremss,
xsvequil,
xsvgnei,
xsvmcflow,
xsvmeka,
xsvmekal,
xsvnei,
xsvnpshock,
xsvphabs,
xsvpshock,
xsvraymond,
xsvsedov,
xswabs,
xswndabs,
xsxion,
xszbbody,
xszbremss,
xszedge,
xszgauss,
xszhighect,
xszpcfabs,
xszphabs,
xszpowerlw,
xsztbabs,
xszvarabs,
xszvfeabs,
xszvphabs,
xszwabs,
xszwndabs
- slang
-
usermodel
- tools
-
aconvolve,
acrosscorr,
apowerspectrum,
arestore,
csmooth
|
![[CIAO Logo]](../imgs/ciao_logo_navbar.gif){kind=logo}