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UpdatePeakParameterTableValue v1¶

Summary ¶

Update cell value(s) in a TableWorkspace containing instrument peak profile parameters.

Properties ¶

Name	Direction	Type	Default	Description
InputWorkspace	InOut	TableWorkspace	Mandatory	TableWorkspace containing peak profile parameters
Column	Input	string	Value	Column name of the cell to have value updated. Choices include ‘FitOrTie’, ‘Max’, ‘Min’, ‘StepSize’ and ‘Value’. Allowed values: [‘Value’, ‘FitOrTie’, ‘Min’, ‘Max’, ‘StepSize’]
Rows	Input	long list		List of row numbers of the cell to have value updated
ParameterNames	Input	str list		List of names of parameters that will have their values updated
NewFloatValue	Input	number	0	New value for the specified cell of type ‘float’.
NewStringValue	Input	string		New value for the specified cell of type ‘string’.

In algorithms related to Le Bail Fit and powder diffractomer instrument profile calibration, TableWorkspace containing the peak profile parameters’ information are used as input and output. UpdatePeakParameterTableValue gives user the method to change the value of parameters’ information, including its status to fit, value, minimum/maximum value (for boundary contrains) and step size (for Monte Carlo optimizer).

Format of TableWorkspace ¶

TableWorkspace containing peak profile parameters must have 2 columns, “Name” and “Value”. It can have but not be limited to the following columns, “Min”, “Max”, “Stepsize” and “FitOrTie”.

Specify A Cell or Cells ¶

The cell to have value updated can be specified by its row and column index.

Column index is determined by property “Column”.
Row index can be specified by property “Row”, which requires a list of row indexes, or property “ParameterNames”, which requires a list of strings. If “ParameterNames” is used as the input of row indexes, the algorithm will go through each row to match the string value of cell “Name” (i.e., parameter name) to each input parameter name.
If neither “Row” nor “ParameterNames” is given by user, then all cells in the column will have the value updated to a same value from either “NewFloatValue” or “NewStringValue” according to the type of the cell.
If multiple row indexes are specified, then all the cells of the specified column and rows are updated to same value from either “NewFloatValue” or “NewStringValue”.

How to use algorithm with other algorithms ¶

This algorithm is designed to work with other algorithms to do Le Bail fit.

Usage ¶

Example - Changing the value for a parameter:

tablews=CreateEmptyTableWorkspace()
tablews.addColumn("str", "Name")
tablews.addColumn("double", "Value")
tablews.addRow(["A", 1.34])
tablews.addRow(["B", 2.34])

print("Value before %.2f" % tablews.cell(0, 1))

UpdatePeakParameterTableValue(tablews, Column="Value", ParameterNames=["A"], NewFloatValue=1.00)

print("Value after %.2f" % tablews.cell(0, 1))

Output:

Value before 1.34
Value after 1.00

Categories: AlgorithmIndex | Inelastic\Utility | Transforms\Grouping

Source ¶

Python: UpdatePeakParameterTableValue.py