Dakota Reference Manual: rotation_method

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rotation_method

Method used to build the rotation matrix

## Specification

Alias: none

Argument(s): none

Default: norm

Child Keywords:

| Required/Optional | Description of Group | Dakota Keyword | Dakota Keyword Description
--- | --- | --- | --- | ---
| Required (Choose One) | Rotation Method (Group 1) | unranked | Use the unranked method to obtain the rotation matrix
ranked | Use the ranked method to obtain the rotation matrix

## Description

The rotation matrix for the Adapted Basis method is built starting from a matrix which includes the linear PCE coefficients. The entries of the first row are the linear PCE coefficients. For all the other rows, each row has only one nonzero entry. Depending on the way used to construct all the rows, from the second to last one, there are two implemented methods, unranked and ranked. A followed Gram_schmidt process is applied on the resulting matrix to make it an isometry.

Default Behavior

The default is to use the ranked.

Usage Tips

## Examples

The following method block

    model
      id_model = 'SUBSPACE'
      adapted_basis
        actual_model_pointer = 'FULLSPACE'
        sparse_grid_level = 1
        rotation_method = unranked

changes the default method to the unranked method.