Accumulator

count size_t count [@property getter]: Number of accumulated values.
max double max [@property getter]: Biggest accumulated value.
mean double mean [@property getter]: Average accumulated value.
min double min [@property getter]: Smallest accumulated value.
standardDeviation double standardDeviation [@property getter]: Population standard deviation.
std double std [@property getter]: Sample standard deviation.
var double var [@property getter]: Sample variance.
variance double variance [@property getter]: Population variance.

Examples

import std.range.primitives : put, isOutputRange;
import std.math.operations : isClose;

Accumulator small, big;
static assert(isOutputRange!(Accumulator, double));

static const double[] smallNumbers = [ 4, 7, 13, 16 ];
put(small, smallNumbers);

static const double[] bigNumbers = [ // same as smallnumbers + 1e9
	1.000000004e9, 1.000000007e9, 1.000000013e9, 1.000000016e9 ];
put(big, bigNumbers);

assert(isClose(small.count,             big.count            ));
assert(isClose(small.min  + 1e9,        big.min              ));
assert(isClose(small.max  + 1e9,        big.max              ));
assert(isClose(small.mean + 1e9,        big.mean             ));
assert(isClose(small.var,               big.var              ));
assert(isClose(small.variance,          big.variance         ));
assert(isClose(small.std,               big.std              ));
assert(isClose(small.standardDeviation, big.standardDeviation));

eris math structs

Accumulator