guess_radius¶
-
sherpa.utils.
guess_radius
(x0lo, x1lo, x0hi=None, x1hi=None)[source]¶ Guess the radius parameter of a 2D model.
Parameters: - x1lo (x0lo,) – The independent axes of the grid, in 1D form.
- x1hi (x0hi,) – The upper bounds of each pixel.
Returns: ans – The keys are ‘val’, ‘min’, and ‘max’, which give the radius and its range, in units of the input grid (
x0lo
andx1lo
).Return type: dict
Notes
Currently only
x0lo
is used, and it is assumed to be arranged so that this axis varies fastest (that isx0lo[1] > x0lo[0]
) as well as representing square pixels of the same size.The scaling factor for the minimum and maximum values is taken from the module’s _guess_ampl_scale variable.