The OpenD Programming Language

sumOfLog2s

Compute the sum of binary logarithms of the input range r. The error of this method is much smaller than with a naive sum of log2.

sumOfLog2s
(
Range
)
(
Range r
)

Examples

import std.math.traits : isNaN;

assert(sumOfLog2s(new double[0]) == 0);
assert(sumOfLog2s([0.0L]) == -real.infinity);
assert(sumOfLog2s([-0.0L]) == -real.infinity);
assert(sumOfLog2s([2.0L]) == 1);
assert(sumOfLog2s([-2.0L]).isNaN());
assert(sumOfLog2s([real.nan]).isNaN());
assert(sumOfLog2s([-real.nan]).isNaN());
assert(sumOfLog2s([real.infinity]) == real.infinity);
assert(sumOfLog2s([-real.infinity]).isNaN());
assert(sumOfLog2s([ 0.25, 0.25, 0.25, 0.125 ]) == -9);

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