SortTableWorkspace dialog.
Table of Contents
| Name | Direction | Type | Default | Description |
|---|---|---|---|---|
| InputWorkspace | Input | TableWorkspace | Mandatory | An input workspace. |
| OutputWorkspace | Output | TableWorkspace | Mandatory | An output workspace. |
| Columns | Input | str list | Column names to sort by. | |
| Ascending | Input | int list | List of bools for each column: true for ascending order, false for descending. If contains a single value it applies to all columns. |
This algorithm sorts rows in a table workspace. Give the names of the columns to sort by in Columns property. The Ascending property allows one to set the sorting order for each column. If a single value is set to Ascending then it applies to all columns.
When multiple columns are given the table is sorted by the first name in the list. If this column contains equal values then these rows are sorted by the second column and so on.
Example - SortTableWorkspace
# a method to print a row
def print_row(row):
print("{{'y': '{0}', 'x': {1}, 'z': {2}}}".format(row["y"],row["x"],row["z"]))
# Create a host workspace
table = CreateEmptyTableWorkspace()
table.addColumn("int", "x")
table.addColumn("str", "y")
table.addColumn("double", "z")
# Put in some values
table.addRow([3, "three (3)", 0.0])
table.addRow([1, "one (3)", 1.0])
table.addRow([1, "one (2)",2.0])
table.addRow([2, "two (1)", 3.0])
table.addRow([3, "three (2)", 4.0])
table.addRow([3, "three (2)", 5.0])
table.addRow([2, "two (2)", 6.0])
table.addRow([1, "one (1)", 7.0])
table.addRow([2, "two (1)", 8.0])
table.addRow([2, "two (2)",9.0])
# Sort in ascending order
sorted_asc = SortTableWorkspace(table, Columns = ['x','y','z'])
print('Sorted ascending')
for i in range(sorted_asc.rowCount()):
print_row(sorted_asc.row(i))
# Sort in descending order
sorted_des = SortTableWorkspace(table, Columns = ['x','y','z'], Ascending = [False])
print('Sorted descending')
for i in range(sorted_des.rowCount()):
print_row(sorted_des.row(i))
Output:
Sorted ascending
{'y': 'one (1)', 'x': 1, 'z': 7.0}
{'y': 'one (2)', 'x': 1, 'z': 2.0}
{'y': 'one (3)', 'x': 1, 'z': 1.0}
{'y': 'two (1)', 'x': 2, 'z': 3.0}
{'y': 'two (1)', 'x': 2, 'z': 8.0}
{'y': 'two (2)', 'x': 2, 'z': 6.0}
{'y': 'two (2)', 'x': 2, 'z': 9.0}
{'y': 'three (2)', 'x': 3, 'z': 4.0}
{'y': 'three (2)', 'x': 3, 'z': 5.0}
{'y': 'three (3)', 'x': 3, 'z': 0.0}
Sorted descending
{'y': 'three (3)', 'x': 3, 'z': 0.0}
{'y': 'three (2)', 'x': 3, 'z': 5.0}
{'y': 'three (2)', 'x': 3, 'z': 4.0}
{'y': 'two (2)', 'x': 2, 'z': 9.0}
{'y': 'two (2)', 'x': 2, 'z': 6.0}
{'y': 'two (1)', 'x': 2, 'z': 8.0}
{'y': 'two (1)', 'x': 2, 'z': 3.0}
{'y': 'one (3)', 'x': 1, 'z': 1.0}
{'y': 'one (2)', 'x': 1, 'z': 2.0}
{'y': 'one (1)', 'x': 1, 'z': 7.0}
Categories: Algorithms | Utility\Sorting
C++ source: SortTableWorkspace.cpp (last modified: 2016-06-17)
C++ header: SortTableWorkspace.h (last modified: 2018-02-22)