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Using the RExpression Actor in Kepler Workflows. Dan Higgins, Josh Madin National Center for Ecological Analysis & Synthesis (NCEAS) UC Santa Barbara. RExpression actors with customized R scripts and input/output ports can be saved and imported into Kepler actor list

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Using the RExpression Actor in Kepler Workflows


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using the rexpression actor in kepler workflows
Using the RExpression Actor in Kepler Workflows

Dan Higgins, Josh Madin

National Center for Ecological Analysis & Synthesis (NCEAS)

UC Santa Barbara

  • RExpression actors with
  • customized R scripts and input/output ports can
  • be saved and imported into Kepler actor list
  • Examples of some custom actors are shown here.
  • Provides tools for
  • users that are unfamiliar
  • with R scripts
  • RExpression actor executes ‘R’ scripts for data manipulation, statistical calculations, and graphics creation
  • Like the Expression actor, input ports are added with names that are used for input variables in the R script
  • Multiple output ports can be added with names matching R script parameter names
  • RExpression actors are especially useful for:
  • Reading & manipulating tabular data (data.frames)
    • sorting
    • subselections
    • reformatting
  • Performing many different statistical operations
  • RExpression actors can create a variety of graphs, plots, and visual displays
  • R creates pdf or png files; file name is supplied on RExpression output port

For information on R: http://www.r-project.org

Kepler: http://www.kepler-project.org

SEEK: http://seek.ecoinformatics.org

Work supported by the National Science Foundation under Grant 0225676 (SEEK)