Module functions for assigning source and background error estimates.
Integer_Type set_errors([Integer_Type,]Array_Type)
Integer_Type set_berrors([Integer_Type,]Array_Type)
Success/Error Return Values: 1/0
Arguments:
(1) Dataset number (default 1)
(2) An array of source/background error estimates
Note that if only one argument is provided, it is assumed to be an
array, and the dataset is assumed to be dataset 1.
The set_errors
and set_berrors functions allow the user
to assign new source and background error estimates
to Sherpa datasets.
Note that:
-
Any errors that are assigned via set_errors replace
the error estimates that Sherpa makes automatically
using the current STATISTIC setting, and are
used until the errors are explicitly redefined.
-
The input array length must match the number of bins in the
filtered dataset;
consequently, if one's goal is to use these functions in data manipulation,
it is important not to change the
filter in Sherpa between any call to, e.g.,
get_errors and set_errors!
-
The input array is typecast to match the type of its associated
dataspace (see, e.g., set_axes for a
definition of dataspaces).
For instance, if dataset 3 is of Double_Type, then when
set_errors(3,<array>) is run, the array is typecast to
Double_Type if necessary.
See the related Sherpa commands
ERRORS
and
BERRORS
for more information.
Cause Sherpa to perform a least-squares fit:
sherpa> DATA spec.dat
sherpa> d = get_data()
sherpa> d[*] = 1
sherpa> () = set_errors(,d)
In this example,
an array of the length of the filtered data is retrieved from
Sherpa, and all elements of the array are reset to
1. This new array
is then sent to Sherpa, where it overwrites
the old array of error estimates.
- sherpa
-
berrors,
bsyserrors,
compute_errors,
compute_statistic,
covariance,
errors,
ftest,
get_paramest,
get_paramestint,
get_paramestlim,
get_paramestreg,
goodness,
interval-projection,
interval-uncertainty,
list_paramest,
mlr,
projection,
region-projection,
region-uncertainty,
restore_paramest,
run_paramest,
run_paramestint,
run_paramestlim,
run_paramestreg,
set_syserrors,
staterrors,
syserrors,
uncertainty
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