plyr
Tools for Splitting, Applying and Combining Data
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install.packages("plyr")Official docs outline
Extra Credit builds an outline of plyr's docs the first time your work uses it. Until then, start at the official documentation.
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cellranger Translate Spreadsheet Cell Ranges to Rows and Columns
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rematch Match Regular Expressions with a Nicer 'API'
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igraph Network Analysis and Visualization
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timechange Efficient Manipulation of Date-Times
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waldo Find Differences Between R Objects
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reshape2 Flexibly Reshape Data: A Reboot of the Reshape Package
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lmtest Testing Linear Regression Models
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colorspace A Toolbox for Manipulating and Assessing Colors and Palettes
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brio Basic R Input Output
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loo Efficient Leave-One-Out Cross-Validation and WAIC for Bayesian Models
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blob A Simple S3 Class for Representing Vectors of Binary Data ('BLOBS')
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praise Praise Users