Modern Math Mean

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Mean

Returns the average of an array, or NaN if it is empty.

Syntax

Mean( byref a as Array( of T ) ) as float64

Notes

• Computed through the compensated Sum, so a long array of values with very different magnitudes does not drift.
• Returns a float64 whatever T is, because the mean of integers is not an integer.
• An empty array gives NaN.

Examples

#import "std/numeric"
#import "std/containers"
using numeric
using containers

dim as Array( of float64 ) a = { 2.0, 4.0, 4.0, 4.0, 6.0 }

print Mean( a )           '' 4

'' It goes through the compensated Sum, so magnitudes that would defeat
'' a naive loop still average correctly
dim as Array( of float64 ) b = { 1e16, 1.0, -1e16, 1.0 }
print Mean( b )           '' 0.5

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Library: Math Library
Category: Math Library
Documented under: Members