SumsAndSquares
Return sum and sum of squares of values.
Declaration
Source position: math.pp line 457
procedure SumsAndSquares(const data: Array of Single; var sum: Float;
var sumofsquares: Float);
procedure SumsAndSquares(const data: PSingle; const N: Integer;
var sum: Float; var sumofsquares: Float);
procedure SumsAndSquares(const data: Array of Double; var sum: Float;
var sumofsquares: Float);
procedure SumsAndSquares(const data: PDouble; const N: Integer;
var sum: Float; var sumofsquares: Float);
procedure SumsAndSquares(const data: Array of Extended; var sum: Float;
var sumofsquares: Float);
procedure SumsAndSquares(const data: PExtended; const N: Integer;
var sum: Float; var sumofsquares: Float);
Description
sumsandsquares calculates the sum of the values and the sum of the squares of the values in the data array and returns the results in sum and sumofsquares.
The second form of the function accepts a pointer to an array of N values.
Errors
None.
See also
| Name | Description |
|---|---|
| sum | Return sum of values |
| sumofsquares | Return sum of squares of values |
| totalvariance | Return total variance of values |
| variance | Return variance of values |
Example
Program Example45;
{ Program to demonstrate the SumOfSquares function. }
{ @ should return typed pointer }
{$T+}
Uses math;
Var
I : 1..100;
ExArray : Array[1..100] of Float;
s,ss : float;
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);
SumsAndSquares(ExArray,S,SS);
Writeln('Sum : ',S:8:4);
Writeln('Sum squares : ',SS:8:4);
SumsAndSquares(@ExArray[1],100,S,SS);
Writeln('Sum (b) : ',S:8:4);
Writeln('Sum squares (b) : ',SS:8:4);
end.