[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: line 0

`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

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.

Documentation generated on: Feb 26 2014