Here are the examples of the python api sqlalchemy.func.log taken from open source projects. By voting up you can indicate which examples are most useful and appropriate.
4 Examples
3
View Complete Implementation : SampleModelClasses.py
Copyright BSD 3-Clause "New" or "Revised" License
Author : sdss
Copyright BSD 3-Clause "New" or "Revised" License
Author : sdss
def logmast(parameter):
@hybrid_property
def mast(self):
par = getattr(self, parameter)
return math.log10(par) if par > 0. else 0.
@mast.expression
def mast(cls):
par = getattr(cls, parameter)
return cast(case([(par > 0., func.log(par)),
(par == 0., 0.)]), Float)
return mast
0
View Complete Implementation : DataModelClasses.py
Copyright BSD 3-Clause "New" or "Revised" License
Author : sdss
Copyright BSD 3-Clause "New" or "Revised" License
Author : sdss
@nsa_logmstar.expression
def nsa_logmstar(cls):
return func.log(cls.nsa_mstar)
0
View Complete Implementation : DataModelClasses.py
Copyright BSD 3-Clause "New" or "Revised" License
Author : sdss
Copyright BSD 3-Clause "New" or "Revised" License
Author : sdss
@nsa_logmstar_el.expression
def nsa_logmstar_el(cls):
return func.log(cls.nsa_mstar_el)
0
View Complete Implementation : SampleModelClasses.py
Copyright BSD 3-Clause "New" or "Revised" License
Author : sdss
Copyright BSD 3-Clause "New" or "Revised" License
Author : sdss
def HybridMag(flux_parameter, band, index=None):
"""Returns a hybrid property describing an asinh magnitude.
``flux_parameter`` must be a column with a flux in nanomaggies. ``band`` is
the band name, to determine the softening parameter. If ``flux_parameter``
is and array, ``index`` defines the position of ``band`` within the array.
"""
@hybrid_property
def hybridMag(self):
if index is not None:
flux = getattr(self, flux_parameter)[index]
else:
flux = getattr(self, flux_parameter)
flux *= 1e-9 # From nanomaggies to maggies
bb_band = bb[band]
asinh_mag = -2.5 / np.log(10) * (np.arcsinh(flux / (2. * bb_band)) + np.log(bb_band))
return asinh_mag
@hybridMag.expression
def hybridMag(cls):
if index is not None:
# It needs to be index + 1 because Postgresql arrays are 1-indexed.
flux = getattr(cls, flux_parameter)[index + 1]
else:
flux = getattr(cls, flux_parameter)
flux *= 1e-9
bb_band = bb[band]
xx = flux / (2. * bb_band)
asinh_mag = (-2.5 / func.log(10) *
(func.log(xx + func.sqrt(func.pow(xx, 2) + 1)) + func.log(bb_band)))
return cast(asinh_mag, Float)
return hybridMag