6.4

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SortTableWorkspace v1

../_images/SortTableWorkspace-v1_dlg.png

SortTableWorkspace dialog.

Properties

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.

Description

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.

Usage

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: AlgorithmIndex | Utility\Sorting