page_title: EAS3
section_title: Functionality
hierarchical_section_title: EAS3 / Functionality
caption_attribution_description: Screenshot of eas3: computation of derivative
context_page_description: EAS3 is a software toolkit for reading and writing structured binary data with geometry information and for postprocessing of these data. It is meant to exchange floating-point data according to IEEE standard between different computers, to modify them or to convert them into other file formats. It can be used for all kinds of structured data sets. It is mainly used in the field of direct numerical simulations.
context_section_description: The actual EAS3 executable is a command-line interface for alteration of EAS3 files. The implemented commands range from basic operations, e.g. simple computations, file operations, to rather complex operations like Fourier transformation or the computation of derivatives. Specific commands for DNS data are also available, e.g. the lambda2 vortex criterion. As the commands are read from standard input, EAS3 may be used in shell scripts for automated calls.
  Outline of important functions
  file management: rearrangement, attaching two files, cutting
  conversion to other file formats (ASCII, Covise, Tecplot)
  mathematical operationes: basic operations, logarithm, etc.
  derivatives und integration
  interpolation
  data reduction: mean values, RMS-values, etc.
  Fourier transformation: single/double, real/complex
  DNS specific: vortex criterion
caption: Screenshot of EAS3: Computing the spatial derivative along the first spatial dimension.
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