Configure INTERVAL-UNCERTAINTY in Sherpa.
The Sherpa configuration variable (also called "state
object") sherpa.intunc contains settings of
INTERVAL-UNCERTAINTY for plotting the fit statistic
as a function of parameter value, using the
UNCERTAINTY algorithm in Sherpa.
See ahelp INTERVAL-UNCERTAINTY for more details.
The sherpa.intunc fields are listed in the table:
| arange |
If 1, the grid limits are to be determined automatically. If 0, the
grid limits are specified (see min and max).
|
| min |
Specifies the grid minimum.
This is always a linear quantity, regardless of the setting of
log (see below).
The setting is ignored if arange = 1.
|
| max |
Specifies the grid maximum.
This is always a linear quantity, regardless of the setting of
log (see below).
The setting is ignored if arange = 1.
|
| log |
Specifies whether to use a linear (0) or
logarithmic (1) spacing of grid points.
|
| nloop |
Specifies the number of grid points.
|
| sigma |
Specifies the number of sigma
(i.e., the change in statistic) for the plot.
|
Field values may be set using directly, e.g.,
sherpa> sherpa.intunc.arange = 0
To restore the default settings use the Sherpa/S-Lang
module function restore_intunc.
List the current and default values of the intunc structure,
and restore the default values:
sherpa> sherpa.intunc.arange = 0
sherpa> sherpa.intunc.log = 1
sherpa> sherpa.intunc.sigma = 5
sherpa> list_intunc
Parameter Current Default Description
----------------------------------------------------------------------
arange 0 1 Auto-range: 0(n)/1(y)
min 0 0 Minimum value
max 0 0 Maximum value
log 1 0 Log-spacing: 0(n)/1(y)
nloop 100 100 Number of grid points
sigma 5 1 Number of sigma
sherpa> restore_intunc
sherpa> list_intunc
Parameter Current Default Description
----------------------------------------------------------------------
arange 1 1 Auto-range: 0(n)/1(y)
min 0 0 Minimum value
max 0 0 Maximum value
log 0 0 Log-spacing: 0(n)/1(y)
nloop 100 100 Number of grid points
sigma 1 1 Number of sigma
Create aliase for sherpa.intproj
sherpa> variable si = sherpa.intunc
sherpa> si.arange = 0
|
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