Using the rexpression actor in kepler workflows
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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 l.jpg
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)


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