Dakota Reference Manual  Version 6.4
Large-Scale Engineering Optimization and Uncertainty Analysis
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Selects annotated tabular file format for experiment data


This keyword is related to the topics:


Alias: none

Argument(s): none

Default: annotated format


An annotated tabular file is a whitespace-separated text file with one leading header row of comments/column labels. For experiment data files, each subsequent row contains an experiment ID, followed by data for configuration variables, observations, and/or observation errors, depending on context.

Default Behavior

By default, Dakota imports tabular experiment data files in annotated format. The annotated keyword can be used to explicitly specify this.

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 annotated experimental data file containing a header row, leading exp_id column, and experiment data in a calibration study

  scalar_data_file 'shock_experiment.dat'

Example data file with two measured quantities, three experiments:

%exp_id     velocity    stress
1       18.23       83.21
2       34.14       93.24
3       22.41       88.92