mp_units::utility::log

Natural logarithm of an uncertain value

Synopsis

Declared in <mp-units/utility/uncertain.h>

[[nodiscard]] constexpr uncertain log(uncertain const& arg)
  requires requires { log(arg.value()); } || requires { std::log(arg.value()); };

Description

NOTE

Formula: if f = ln(x), then σf = |σx / x| = σ_x / x (for positive x)

NOTE

Relative uncertainty in x becomes absolute uncertainty in ln(x).

Return Value

Note

The return value should not be discarded.