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Home MathPack DataTable Methods IsConstantColumn
See also: FillMarkedCells, IsDichotomousColumn, IsConstantRow 

IsConstantColumn

Unit: SDL_datatable
Class: TDataTable
Declaration: [1] function IsConstantColumn (ColIx: longint): boolean;
[2] function IsConstantColumn (ColIx: longint; var ConstVal: double): boolean;

The function IsConstantColumn returns TRUE if all values in the column ColIx are the same. The overloaded version [2] additionally returns the found constant value in the variable parameter ConstVal (please note that ConstVal is undefined if the function returns a FALSE value.

Hint: The comparison of the values is based on the comparison of floating point numbers, thus rounding effects have to be taken into consideration.


Last Update: 2023-Dec-14