pint.derived_quantities.pferrs

pint.derived_quantities.pferrs(porf: Quantity, porferr: Quantity, pdorfd: Quantity | None = None, pdorfderr: Quantity | None = None)

Convert P, Pdot to F, Fdot with uncertainties (or vice versa).

Calculate the period or frequency errors and the Pdot or fdot errors from the opposite ones.

Parameters:

• porf (astropy.units.Quantity) – pulsar period (or frequency), \(P\) or \(f\)

• porferr (astropy.units.Quantity) – pulsar period uncertainty (or frequency uncertainty), \(\\sigma_P\) or \(\\sigma_f\)

• pdorfd (astropy.units.Quantity, optional) – pulsar period derivative (or frequency derivative), \(\\dot P\) or \(\\dot f\)

• pdorfderr (astropy.units.Quantity, optional) – pulsar period derivative uncertainty (or frequency derivative uncertainty) \(\\sigma_{\\dot P}\) or \(\\sigma_{\\dot f}\)

Returns:

• forp (astropy.units.Quantity) – pulsar frequency (or period) \(f\) or \(P\)

• forperr (astropy.units.Quantity) – pulsar frequency uncertainty (or period uncertainty) \(\\sigma_f\) or \(\\sigma_P\)

• fdorpd (astropy.units.Quantity) – pulsar frequency derivative (or period derivative) if pdorfd supplied \(\\dot f\) or \(\dot P\)

• fdorpderr (astropy.units.Quantity) – if pdorfd supplied, then pulsar frequency derivative uncertainty (or period derivative uncertainty), \(\\sigma_{\\dot f}\) or \(\\sigma_{\\dot P}\)