Dakota Reference Manual: expansion_bases

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expansion_bases

Specify the number of basis functions to be used in the random field representation. THIS IS AN EXPERIMENTAL CAPABILITY.

## Specification

Alias: none

Argument(s): INTEGER

## Description

This control allows the user to specify the number of basis functions to be used in the random field representation (e.g. either a Karhunen-Loeve or Principal Components expansion). Typically, a small number of basis functions (3-5) will be sufficient to represent a significant amount of the variance in the response field. However, this depends on the particulars of the problem. THIS IS AN EXPERIMENTAL CAPABILITY UNDER ACTIVE DEVELOPMENT.

Default Behavior If the user specifies neither `trunction_tolerance` nor `expansion_bases`, then the number of expansion bases that captures 95% of the variance will be used.