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Return standard deviation of data
Source position: math.pp line 518
function StdDev( |
const data: array of Single |
):Float; |
const data: PSingle; |
const N: Integer |
):Float; |
const data: array of Double |
):Float; |
const data: PDouble; |
const N: Integer |
):Float; |
const data: array of Extended |
):Float; |
const data: PExtended; |
const N: Integer |
):Float; |
Stddev returns the standard deviation of the values in Data. It returns zero if there is only one value.
The second form of the function accepts a pointer to an array of N values.
None.
|
Return mean value of array |
|
|
Return mean and standard deviation of array |
|
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Return variance of values |
|
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Return total variance of values |
Program Example40; { Program to demonstrate the stddev function. } { @ should return typed pointer } {$T+} Uses Math; Var I : Integer; ExArray : Array[1..10000] of Float; begin Randomize; for I:=low(ExArray) to high(ExArray) do ExArray[i]:=Randg(1,0.2); Writeln('StdDev : ',StdDev(ExArray):8:4); Writeln('StdDev (b) : ',StdDev(@ExArray[1],10000):8:4); end.