atol1e8

atol1e8 is a naming convention you may encounter in programming and numerical analysis to refer to a specific absolute tolerance value used in floating-point comparisons or convergence criteria. It is not an official standard or widely adopted API name, but rather a label that appears in source code, configuration files, or documentation to designate a particular tolerance constant within a given project.

In numerical computation, tolerance parameters help determine when two values are effectively the same or when an iterative method has converged. The most common terms are absolute tolerance (atol) and relative tolerance (rtol). A token like atol1e8 typically encodes a magnitude or identity of the tolerance in the context where it is defined, but its exact numeric value is defined by the surrounding code or configuration. A typical usage pattern might resemble a comparison such as abs(x - y) <= atol1e8 + rtol * abs(y), though the exact form depends on the library or implementation.

Context matters: since atol1e8 is not a standardized concept, its meaning can vary between projects. When you encounter it, consult the specific codebase or documentation to determine the actual numeric value and how it interacts with other tolerances. The broader concept it represents aligns with general practices in tolerance design for floating-point arithmetic, numerical solvers, and convergence criteria.

See also: absolute tolerance, relative tolerance, numerical stability, isclose, numpy.isclose, SciPy’s allclose.