guess_radius
- sherpa.utils.guess_radius(x0lo, x1lo, x0hi=None, x1hi=None)[source] [edit on github]
Guess the radius parameter of a 2D model.
- Parameters
x0lo (array_like) – The independent axes of the grid, in 1D form.
x1lo (array_like) – The independent axes of the grid, in 1D form.
x0hi (array_like or None, optional) – The upper bounds of each pixel.
x1hi (array_like or None, optional) – 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
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.