Dakota Reference Manual  Version 6.4
Large-Scale Engineering Optimization and Uncertainty Analysis
 All Pages

Selects custom-annotated tabular file format for experiment data


This keyword is related to the topics:


Alias: none

Argument(s): none

Default: annotated format

Required/Optional Description of Group Dakota Keyword Dakota Keyword Description
Optional header

Enable header row in custom-annotated tabular file

Optional exp_id

Enable experiment ID column in custom-annotated tabular file


A custom-annotated tabular file is a whitespace-separated text file containing experiment data, including configuration variables, observatiions, and/or observation errors, depending on context. For experiment import, custom-annotated allows user options for whether header row and exp_id column appear in the tabular file, thus bridging freeform and (fully) annotated.

Default Behavior

By default, Dakota imports tabular experiment data files in annotated format. The custom_annotated keyword, followed by options can be used to select other formats.

Usage Tips

  • Prior to October 2011, calibration and surrogate data files were in free-form format. They now default to annotated format, though freeform remains an option.
  • When importing tabular data, a warning will be generated if a specific number of data are expected, but extra is found and an error generated when there is insufficient data.


Import an experimental data file containing a header row, no leading exp_id column, and experiment data in a calibration study

  scalar_data_file 'shock_experiment.dat'
    custom_annotated header

Example data file with two measured quantities, three experiments:

%   velocity    stress
    18.23       83.21
    34.14       93.24
    22.41       88.92