Gri: `reorder' command

Chapters: 1: Introduction 2: Simple example 3: Invocation 4: Finer Control 5: X-Y Plots 6: Contour Plots 7: Image Plots 8: Examples 9: Gri Commands 10: Programming 11: Environment 12: Emacs Mode 13: History 14: Installation 15: Gri Bugs 16: Test Suite 17: Gri in Press 18: Acknowledgments 19: License Indices: Concepts Commands Variables | ### 9.3.35: ``reorder`'
    `reorder columns randomly \
      |{ascending in x|y|z} \
      |{descending in x|y|z}'
Reorder the columns in various ways. In the ``randomly`' style, the column data are shuffled randomly by index, retaining the correspondance between a given x and y. This is useful with ``draw symbol`' using colored dots -- it prevents the overpainting of one dot on another from biasing the color field to values that happened to occur near the end of the column data. If you prefer the overpainting to be done in random order, use this command to reorder the columns randomly. The random number is selected using the system ``rand`' call, with the seed being provided by the PID (process ID) of the job. The ``ascending`' and ``descending`' styles do what you'd expect.