TableGroups¶
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class
astropy.table.
TableGroups
(parent_table, indices=None, keys=None)[source] [edit on github]¶ Bases:
astropy.table.groups.BaseGroups
Attributes Summary
indices
key_colnames
Return the names of columns in the parent table that were used for grouping. keys
Methods Summary
aggregate
(func)Aggregate each group in the Table into a single row by applying the reduction function func
to group values in each column.filter
(func)Filter groups in the Table based on evaluating function func
on each group sub-table.Attributes Documentation
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indices
¶
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key_colnames
¶ Return the names of columns in the parent table that were used for grouping.
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keys
¶
Methods Documentation
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aggregate
(func)[source] [edit on github]¶ Aggregate each group in the Table into a single row by applying the reduction function
func
to group values in each column.Parameters: - func : function
Function that reduces an array of values to a single value
Returns: - out : Table
New table with the aggregated rows.
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filter
(func)[source] [edit on github]¶ Filter groups in the Table based on evaluating function
func
on each group sub-table.The function which is passed to this method must accept two arguments:
table
:Table
objectkey_colnames
: tuple of column names intable
used as keys for grouping
It must then return either
True
orFalse
. As an example, the following will select all table groups with only positive values in the non-key columns:def all_positive(table, key_colnames): colnames = [name for name in table.colnames if name not in key_colnames] for colname in colnames: if np.any(table[colname] < 0): return False return True
Parameters: - func : function
Filter function
Returns: - out : Table
New table with the aggregated rows.
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