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

### 9.3.5: The ``create`' commands

- Create Columns From Function: prepare to draw a function
- Create Image Grayscale: prepare to draw banded image

#### 9.3.5.1: ``create columns from function`'

    `create columns from function'

Plot a function of x which is defined in synonym \function.

    ENVIRONMENT
    \function = function to plot.
    \xmin     = minimum x value
    \xmax     = maximum x value
    \xinc     = increment in x values

    EXAMPLE
    \function = "cos(x)"
    \xmin     = "0"
    \xmax     = "2 * 3.14"
    \xinc     = "0.1"
    create columns from function
    draw curve

NOTE: This only works on machines which have the ``awk`' command available at the commandline. This means most unix machines and some vax machines.

#### 9.3.5.2: ``create image grayscale`'

    `create image grayscale banded .band.'

Make a banded grayscale with in units of .band. pixel values each. Thus, pixel values 0 to (.band. - 1) on the image will map to 0, while values from .band. to (2 * .band. - 1) will map to .band., etc. For example, .band. = 2 gives grayscale = (0 0 2 2 4 4 6 6 ... 252 252 254 254).