Module functions to set a model stack expression.
Integer_Type set_source_expr([Integer_Type,]String_Type])
Integer_Type set_bg_expr([Integer_Type,]String_Type])
Integer_Type set_inst_expr([Integer_Type,]String_Type])
Integer_Type set_sinst_expr([Integer_Type,]String_Type])
Integer_Type set_binst_expr([Integer_Type,]String_Type])
Success/Error Return Values: 1/0
Arguments:
(1) Dataset number (default 1)
(2) A string expression
Note that if only one argument is provided, it is assumed to be a
string expression, and the dataset is assumed to be dataset 1.
These functions set model stack expressions;
set_sinst_expr and set_binst_expr
set instrument model stack expressions for the source dataset only,
and the background dataset only, respectively.
See the related Sherpa commands
SOURCE,
BACKGROUND,
and
INSTRUMENT for more information.
NOTE: In CIAO 3.1 the instrument model stack expression for the
background dataset is required for simultanous filtering in energy/wave or
fitting of PHA files.
Specify the source model stack expression for dataset 3:
sherpa> PARAMPROMPT OFF
sherpa> GAUSS[g]
sherpa> POW[p]
sherpa> () = set_source_expr(3,"p+g")
Specify a source model stack expression for dataset 1:
sherpa> () = set_source_expr("xswabs[xs1]*(pow[p]+gauss[g])")
sherpa> get_source_expr()
(xs1 * (p + g))
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