def binned_pixelrange(self, waverange, **kwargs):
"""Calculate the number of pixels within the given wavelength
range and `binset`.
Parameters
----------
waverange : tuple of float or `~astropy.units.quantity.Quantity`
Lower and upper limits of the desired wavelength range.
If not a Quantity, assumed to be in Angstrom.
kwargs : dict
Keywords accepted by :func:`synphot.binning.pixel_range`.
Returns
-------
npix : number
Number of pixels.
Raises
------
synphot.exceptions.UndefinedBinset
Undefined `binset`.
"""
if self.binset is None:
raise synexceptions.UndefinedBinset(
'No binset specified for this passband.')
x = units.validate_quantity(
waverange, self._internal_wave_unit, equivalencies=u.spectral())
return binning.pixel_range(self.binset.value, x.value, **kwargs)
def binned_waverange(self, cenwave, npix, **kwargs):
"""Calculate the wavelength range covered by the given number
of pixels centered on the given central wavelengths of `binset`.
Parameters
----------
cenwave : float or `~astropy.units.quantity.Quantity`
Desired central wavelength.
If not a Quantity, assumed to be in Angstrom.
npix : int
Desired number of pixels, centered on ``cenwave``.
kwargs : dict
Keywords accepted by :func:`synphot.binning.wave_range`.
Returns
-------
waverange : `~astropy.units.quantity.Quantity`
Lower and upper limits of the wavelength range,
in the unit of ``cenwave``.
Raises
------
synphot.exceptions.UndefinedBinset
Undefined `binset`.
"""
if self.binset is None:
raise synexceptions.UndefinedBinset(
'No binset specified for this passband.')
# Calculation is done in the unit of cenwave.
if not isinstance(cenwave, u.Quantity):
cenwave = cenwave * self._internal_wave_unit
bin_wave = units.validate_quantity(self.binset,
cenwave.unit,
equivalencies=u.spectral())
return binning.wave_range(bin_wave.value, cenwave.value, npix, **
kwargs) * cenwave.unit