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 | ### 9.3.7: ``delete`'
    `delete .variable.|\synonym [.variable.|\synonym [...]]'
    `delete columns [where missing]'
    `delete columns [randomly .fraction.]'
    `delete grid'
    `delete [x|y] scale'
Delete some item or characteristic. ``delete .variable.`' Delete definition of variable ``.variable.`', making it undefined. Any number of variables or synonyms may be specified on one line. ``delete \synonym`' Delete definition of synonym ``\synonym`', making it undefined. Any number of variables or synonyms may be specified on one line. ``delete \@alias`' Delete the item named by the alias (see Alias Synonyms). ``delete`' with an ``&`' item Delete the item in the calling program. ``delete columns`' Delete column data. ``delete columns where missing`' Completely delete all column data for which any one of x, y, etc is missing. ``delete columns randomly .fraction.`' Randomly select fraction ``.fraction.`' of the non-missing column data, and designate them as being missing. ``delete grid`' Delete grid data. ``delete scale`' Delete scales for both x and y, so next ``read columns`' will set it. ``delete x scale`' Delete scales for x, so next ``read columns`' will set it. ``delete y scale`' Delete scales for y, so next ``read columns`' will set it.