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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

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Using the RExpression Actor in Kepler Workflows

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  1. 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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