Mean

Return mean value of array

Declaration

Source position: math.pp line 423

  function Mean(const data: Array of Single) : Float;
  function Mean(const data: PSingle; const N: LongInt) : Float;
  function Mean(const data: Array of Double) : Float;
  function Mean(const data: PDouble; const N: LongInt) : Float;
  function Mean(const data: Array of Extended) : Float;
  function Mean(const data: PExtended; const N: LongInt) : Float;
  function Mean(const data: PInt64; const N: LongInt) : Float;
  function Mean(const data: Array of Int64) : Float;
  function Mean(const data: PInteger; const N: LongInt) : Float;
  function Mean(const data: Array of Integer) : Float;

Description

Mean returns the average value of data. The second form accepts a pointer to an array of N values.

Errors

None.

See also

Name Description
meanandstddev Return mean and standard deviation of array
momentskewkurtosis Return 4 first moments of distribution
sum Return sum of values

Example

Program Example27;
{ Program to demonstrate the Mean function. }
{ @ should return typed pointer }
{$T+}
Uses math;
Type
  TExArray = Array[1..100] of Float;
Var
  I : Integer;
  ExArray : TExArray;
begin
  Randomize;
  for I:=low(ExArray) to high(ExArray) do
    ExArray[i]:=(Random-Random)*100;
  Writeln('Max      : ',MaxValue(ExArray):8:4);
  Writeln('Min      : ',MinValue(ExArray):8:4);
  Writeln('Mean     : ',Mean(ExArray):8:4);
  Writeln('Mean (b) : ',Mean(PExtended(@ExArray[1]),100):8:4);
end.