Source code for gammapy.utils.table

# Licensed under a 3-clause BSD style license - see LICENSE.rst
"""Table helper utilities."""
import numpy as np
from astropy.table import Table
from astropy.units import Quantity
from .units import standardise_unit

__all__ = [
    "hstack_columns",
    "table_row_to_dict",
    "table_standardise_units_copy",
    "table_standardise_units_inplace",
]


[docs]def hstack_columns(table, table_other): """Stack the column data horizontally. Parameters ---------- table : `~astropy.table.Table` Input table. table_other : `~astropy.table.Table` Other input table. Returns ------- stacked : `~astropy.table.Table` Stacked table. """ stacked = Table() for column in table.colnames: data = np.hstack([table[column].data[0], table_other[column].data[0]]) stacked[column] = data[np.newaxis, :] return stacked
[docs]def table_standardise_units_copy(table): """Standardise units for all columns in a table in a copy. Calls `~gammapy.utils.units.standardise_unit`. Parameters ---------- table : `~astropy.table.Table` Input table (won't be modified). Returns ------- table : `~astropy.table.Table` Copy of the input table with standardised column units. """ # Note: we could add an `inplace` option (or variant of this function) # See https://github.com/astropy/astropy/issues/6098 table = Table(table) return table_standardise_units_inplace(table)
[docs]def table_standardise_units_inplace(table): """Standardise units for all columns in a table in place.""" for column in table.columns.values(): if column.unit: column.unit = standardise_unit(column.unit) return table
[docs]def table_row_to_dict(row, make_quantity=True): """Make one source data dictionary. Parameters ---------- row : `~astropy.table.Row` Row. make_quantity : bool, optional Make quantity values for columns with units. Default is True. Returns ------- data : dict Row data. """ data = {} for name, col in row.columns.items(): val = row[name] if make_quantity and col.unit: val = Quantity(val, unit=col.unit) data[name] = val return data