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 FT_AAVG()
 Average numeric values in an array
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 Syntax

      FT_AAVG( <aArray> [, <nStartIndex> [, <nEndIndex> ] ] ) -> nAverage

 Arguments

     <aArray> is the array containing the elements to be averaged.

     <nStartIndex> is the first array item to include,
     defaults to first element.

     <nEndIndex> is the last array element to include,
     defaults to all elements.

 Returns

     The average of the specified array elements.

 Description

     This function is used to get a numeric average of selected or all
     elements of an array.

     This routine requires FT_ASUM().

 Examples

     FT_AAVG(aSubTotals)          // Get Average of Entire Array

     FT_AAVG(aSubTotals, 5)       // Get Average of 5th Element On

     FT_AAVG(aSubTotals, , 10)    // Get Average of 1st 10 Elements

     FT_AAVG(aSubTotals, 5, 10)   // Get Average of Elements 5-10

 Source: AAVG.PRG

 Author: David Husnian