[Overview][Constants][Types][Classes][Procedures and functions][Index] Reference for unit 'math' (#rtl)

# sumsandsquares

Return sum and sum of squares of values.

## Declaration

Source position: math.pp line 410

 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.

 sum Return sum of values sumofsquares Return sum of squares of values totalvariance Return total varians of values variance Return variance of values

## Example

```Program Example45;

{ Program to demonstrate the SumOfSquares function. }

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.
```