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

# SumOfSquares

Return sum of squares of values

## Declaration

Source position: math.pp line 454

 function SumOfSquares( const data: array of Single ):Float;function SumOfSquares( const data: PSingle; const N: Integer ):Float;function SumOfSquares( const data: array of Double ):Float;function SumOfSquares( const data: PDouble; const N: Integer ):Float;function SumOfSquares( const data: array of Extended ):Float;function SumOfSquares( const data: PExtended; const N: Integer ):Float;

## Description

Sumofsquares returns the sum of the squares of the values in the data array.

The second form of the function accepts a pointer to an array of N values.

## Errors

None.

 sum Return sum of values sumsandsquares Return sum and 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;

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('Sum squares     : ',SumOfSquares(ExArray):8:4);
Writeln('Sum squares (b) : ',SumOfSquares(@ExArray[1],100):8:4);
end.
```