Configure PROJECTION in Sherpa.
The Sherpa configuration variable (also called "state
object") sherpa.proj contains settings of
PROJECTION for calculating confidence intervals in
Sherpa. See ahelp PROJECTION for more
details.
The following table lists each field of sherpa.proj, with a
description and the default value:
|
fast
|
Use levenberg-marquardt (or simplex if using Cash) in place of
current optimization method (0 = false, 1 = true)
|
1
|
|
sigma
|
Specifies the number of sigma (i.e. the change in fit statistic).
|
1
|
To restore the default settings use the Sherpa/S-Lang
module function restore_proj.
The sherpa.proj settings can be changed at the command
line.
sherpa> sherpa.proj.fast = 0
List the current settings of sherpa.proj and set confidence level to 1.6 sigma
in the second command.
sherpa> list_proj
Parameter Current Default Description
----------------------------------------------------------------------
fast 1 1 Switch to LM/simplex: 0(n)/1(y)
sigma 1 1 Number of sigma
sherpa> sherpa.proj.sigma=1.6
List the current and default values of sherpa.proj
and restore the default values:
sherpa> sherpa.proj.sigma = 5
sherpa> list_proj
Parameter Current Default Description
----------------------------------------------------------------------
fast 1 1 Switch to LM/simplex: 0(n)/1(y)
sigma 5 1 Number of sigma
sherpa> restore_proj
sherpa> list_proj
Parameter Current Default Description
----------------------------------------------------------------------
fast 1 1 Switch to LM/simplex: 0(n)/1(y)
sigma 1 1 Number of sigma
Create an alias sp to sherpa.proj and use it.
sherpa> variable sp = sherpa.proj
sherpa> sp.fast = 0
|
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