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.