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TRSFMXCustomChartFunction.PopnVariance(TRSCustomChart,TRSCustomChart,Integer,Integer,TDateTime,Integer,Integer) Method |
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Calculates the population variance of all values in the SourceChart over the time period and adds the value to the TargetChart, using the n method (biased): TotalVariance / n. If the TargetChart is of a type that has more than 2 dimensions, such as a TRSLineChart with X and Y values, the new TargetChart value includes the TimeStamp.
Namespace: FMX.RS.ChartFunction
Delphi |
public |
Parameters
SourceChart
Type: TRSCustomChart
Chart to calculate the maximum from
TargetChart
Type: TRSCustomChart
Chart to add the calculated maximum to
IndexLow
Type: Integer
Lower bounds index into the SourceChart
IndexHigh
Type: Integer
Upper bounds index into the SourceChart
TimeStamp
Type: TDateTime
TimeStamp to attach to the new value
SourceDim
Type: Integer
TargetDim
Type: Integer
Note that this function is a class procedure so it may be called even if the TRSCustomChartFunction is not instantiated. The function can also be called by custom functions. For example, you could create a custom function that calls this function and then does something with the result (which is in the last value of the TargetChart) |
