Gri: `delete' command

Gri Commands 1: Introduction 2: Simple example 3: Fancy example 4: Running Gri 5: Programming Gri 6: General Issues 7: X-Y Plots 8: Contour Plots 9: Image Plots 10: Examples 11: Handling Data 12: Gri Commands 13: Gri Extras 14: Evolution of Gri 15: Installing Gri 16: Gri Bugs 17: System Tools 18: Acknowledgments 19: License 20: Newsgroup 21: Concept Index | ## 12.8: The ``delete`' Command
    `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 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.