Creates a data grid on which models may be evaluated.
sherpa> DATASPACE [#] (<range> [, <range>, ...]) [HISTOGRAM]
where # specifies the number of the dataset to be associated with the
dataspace (default dataset number is 1); <range> is defined below; and
HISTOGRAM tells Sherpa to define bins (with lower and upper boundaries)
rather than single gridpoints.
<range> =
<start>:<stop>:<delta>, where
Input Arguments for DATASPACE
| <start> |
The start (minimum) value for the grid. |
| <stop> |
The stop (maximum) value for the grid. |
| <delta> |
The step size between gridpoints. |
If HISTOGRAM is specified, the models will be evaluated
by integrating over bins of width <delta>; otherwise,
models will be evaluated at points on the specified grid.
Note:
HISTOGRAM must be specified in order to evaluate
XSPEC models
additive models (e.g., xsbremss).
A dataspace may also be defined using the Sherpa/S-Lang module
functions
set_axes
and
set_baxes.
(In CIAO 3.0, set_baxes is the only means by
which background dataspaces may be defined.)
Set a 1-D value range on which a source model may be evaluated:
sherpa> DATASPACE (1:5:1)
This command sets the value range, from values 1 through 5, with a step-size of
1, over which a source model may be evaluated.
Set a 2-D value range on which a source model may be evaluated:
sherpa> DATASPACE (1:5:1,1:2:1)
This command sets the value ranges, for two dimensions, over which a
source model may be evaluated.
Set a 1-D value range on which a source model may be evaluated,
for dataset number 2:
sherpa> DATASPACE 2 (1:10:1)
This command sets the value range, from values 1 through 10, with a step-size of
1, over which a source model may be evaluated, for dataset number 2.
- chandra
-
guide
- sherpa
-
autoest,
back,
berrors,
bsyserrors,
bye,
calc_kcorr,
coord,
data,
dcounts,
dollarsign,
echo,
eflux,
eqwidth,
erase,
fakeit,
feffile,
flux,
get,
get_dcounts_sum,
get_dir,
get_eflux,
get_eqwidth,
get_filename,
get_flux2d,
get_flux_str,
get_lfactorial,
get_mcounts_sum,
get_pflux,
get_source_components,
get_verbose,
group,
groupbycounts,
guess,
is,
is_subtracted,
journal,
list,
list_par,
load,
load_arf,
load_ascii,
load_back_from,
load_backset,
load_dataset,
load_fitsbin,
load_image,
load_inst,
load_inst_from,
load_pha,
load_pha2,
load_rmf,
mcounts,
numbersign,
paramest,
plot_eprof,
plot_rprof,
prompt,
read,
reset,
run,
set,
set_analysis,
set_axes,
set_backscale,
set_coord,
set_data,
set_dataspace,
set_dir,
set_exptime,
set_subtract,
set_verbose,
set_weights,
setback,
setdata,
setplot,
sherpa-module,
sherpa_plotfns,
sherpa_utils,
show,
simspec,
subtract,
ungroup,
unsubtract,
use,
version
|
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