packages/vaex-core/vaex/dataframe.py
def add_column_healpix(self, name="healpix", longitude="ra", latitude="dec", degrees=True, healpix_order=12, nest=True):
        """Add a healpix (in memory) column based on a longitude and latitude

        :param name: Name of column
        :param longitude: longitude expression
        :param latitude: latitude expression  (astronomical convenction latitude=90 is north pole)
        :param degrees: If lon/lat are in degrees (default) or radians.
        :param healpix_order: healpix order, >= 0
        :param nest: Nested healpix (default) or ring.
        """
        import healpy as hp
        if degrees:
            scale = "*pi/180"
        else:
            scale = ""
        # TODO: multithread this
        phi = self.evaluate("(%s)%s" % (longitude, scale))
        theta = self.evaluate("pi/2-(%s)%s" % (latitude, scale))
        hp_index = hp.ang2pix(hp.order2nside(healpix_order), theta, phi, nest=nest)
        self.add_column("healpix", hp_index)
def add_column_healpix(self, name="healpix", longitude="ra", latitude="dec", degrees=True, healpix_order=12, nest=True):
        """Add a healpix (in memory) column based on a longitude and latitude

        :param name: Name of column
        :param longitude: longitude expression
        :param latitude: latitude expression  (astronomical convenction latitude=90 is north pole)
        :param degrees: If lon/lat are in degrees (default) or radians.
        :param healpix_order: healpix order, >= 0
        :param nest: Nested healpix (default) or ring.
        """
        import healpy as hp
        if degrees:
            scale = "*pi/180"
        else:
            scale = ""
        # TODO: multithread this
        phi = self.evaluate("(%s)%s" % (longitude, scale))
        theta = self.evaluate("pi/2-(%s)%s" % (latitude, scale))
        hp_index = hp.ang2pix(hp.order2nside(healpix_order), theta, phi, nest=nest)
        self.add_column("healpix", hp_index)
def add_column_healpix ( self , name = "healpix" , longitude = "ra" , latitude = "dec" , degrees = True , healpix_order = 12 , nest = True ) : import healpy as hp if degrees : scale = "*pi/180" else : scale = "" # TODO: multithread this phi = self . evaluate ( "(%s)%s" % ( longitude , scale ) ) theta = self . evaluate ( "pi/2-(%s)%s" % ( latitude , scale ) ) hp_index = hp . ang2pix ( hp . order2nside ( healpix_order ) , theta , phi , nest = nest ) self . add_column ( "healpix" , hp_index )
Add a healpix (in memory) column based on a longitude and latitude

        :param name: Name of column
        :param longitude: longitude expression
        :param latitude: latitude expression  (astronomical convenction latitude=90 is north pole)
        :param degrees: If lon/lat are in degrees (default) or radians.
        :param healpix_order: healpix order, >= 0
        :param nest: Nested healpix (default) or ring.
Add a healpix ( in memory ) column based on a longitude and latitude