Controls the integration of model components.
sherpa> <modelname> INTEGRATE {ON | OFF}
where <modelname> is a name that has been given to a model component by
the user.
Models are integrated over bins in energy-space or wavelength-space
(before being folded through an instrument), or over bins in
counts-space (if no instrument model is specified). If the OFF option is
chosen then, for non-binned data the model values at the entered
data points are used, while for binned data the model values at the
left side of the bin are used in the fitting.
This command cannot be applied to
XSPEC source models or to instrument models.
Also, changing the integration status of a model component will have
no affect if the data are not binned.
One can use the SHOW command to determine
whether a model component is currently being integrated.
The user must be careful not to define an unacceptable mixture of
additive/integrated and multiplicative/non-integrated model components,
such as by adding two model components with different integration statuses.
Sherpa will issue a warning when it detects such an unacceptable mixture.
See also the Sherpa Manual,
Chapter "Sherpa Models",
Subsection "Source Model Integration".
Turn off integration for a model component:
sherpa> POW[modelc]
modelc.gamma parameter value [0]
modelc.ref parameter value [1]
modelc.ampl parameter value [1]
sherpa> modelc INTEGRATE OFF
Turn off integration for a power-law model component:
sherpa> POWLAW1D[p]
sherpa> SHOW p
powlaw1d[p] (integrate: on)
Param Type Value Min Max Units
----- ---- ----- --- --- -----
1 gamma thawed 0 -10 10
2 ref frozen 1-3.4028e+38 3.4028e+38
3 ampl thawed 1 1e-20 3.4028e+38
sherpa> p INTEGRATE OFF
sherpa> SHOW p
powlaw1d[p] (integrate: off)
Param Type Value Min Max Units
----- ---- ----- --- --- -----
1 gamma thawed 0 -10 10
2 ref frozen 1-3.4028e+38 3.4028e+38
3 ampl thawed 1 1e-20 3.4028e+38
- sherpa
-
autoest,
background,
create,
create_model,
createparamset,
fit,
freeze,
get_defined_models,
get_model_params,
get_models,
get_num_par,
get_par,
get_stackexpr,
getx,
gety,
guess,
instrument,
is_paramset,
jointmode,
kernel,
lineid,
linkparam,
mdl,
modelexpr,
modelstack,
nestedmodel,
noise,
paramprompt,
paramset,
pileup,
rename,
run_fit,
set_par,
set_paramset,
set_stackexpr,
source,
thaw,
truncate,
unlink
|
![[CIAO Logo]](../imgs/ciao_logo_navbar.gif){kind=logo}