Dakota Reference Manual: truncation_tolerance

| Dakota Reference Manual Version 6.15 Explore and Predict with Confidence

- Main Page
- Related Pages

All Pages
truncation_tolerance

Specify the maximum percentage (as a decimal) of the eigenvalue energy not captured by the active subspace representation.

## Specification

Alias: none

Argument(s): REAL

## Description

The `truncation_tolerance` is used in the energy truncation method to identify an active subspace. The `truncation` tolerance is used in the following equation to determine the subspace size:

where is the `truncation_tolerance`, is the estimated subspace size, is the size of the full space, and are the eigenvalues of the derivative matrix.

The default value for `truncation_tolerance` is .