▼ |  | PLo T: Graph Plotting

1 | Quick Start
2 | Plotting
3 | Customizing Plots

On this page:

sample-size
scale-vectors
x-values
normalize-vector
normalize-vectors
make-column
xy-list
zgrid
plot-view%
get-x-min
get-y-min
get-x-max
get-y-max
set-line-color
set-line-width
2d-view%
set-labels
plot-vector
plot-vectors
plot-points
plot-line
plot-contours
plot-shades
3d-view%
plot-surface
plot-line
get-z-min
get-z-max
get-alt
get-az

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### 3`` Customizing Plots

( require plot/extend )

The plot/extend module allows you to create your own constructors, further customize the appearance of the plot windows, and in general extend the package.

( sample-size sample-count x-min x-max) → real?
sample-count : exact-positive-integer?
x-min : number
x-max : number

Given sample-count, x-min, and x-max, returns the size of each sample.

( scale-vectors |  | vecs |  |  |  |
|  | x-sample-size |  |  |  |
|  | y-sample-size) |  | → |  | ( listof vector? )

vecs : ( listof vector? )
x-sample-size : real?
y-sample-size : real?

Scales vectors, causing them to fit in their boxes.

( x-values sample-count x-min x-max) → ( listof real? )
sample-count : exact-positive-integer?
x-min : number
x-max : number

Given samples, x-min, and x-max, returns a list of xs spread across the range.

( normalize-vector |  | vec |  |  |  |
|  | x-sample-size |  |  |  |
|  | y-sample-size) |  | → |  | vector?

vec : vector?
x-sample-size : real?
y-sample-size : real?

Normalizes vec based on x-sample-size and y-sample-size.

( normalize-vectors |  | vecs |  |  |  |
|  | x-sample-size |  |  |  |
|  | y-sample-size) |  | → |  | ( listof vector? )

vecs : ( listof vector? )
x-sample-size : real?
y-sample-size : real?

Normalizes vecs based on x-sample-size and y-sample-size.

( make-column x ys) → ( listof ( vector/c real? real? ))
x : real?
ys : ( listof real? )

Given an x and a list of ys, produces a list of points pairing the x with each of the ys.

( xy-list sample-count x-min x-max y-min y-max)
→ ( listof ( listof ( vector/c real? real? )))
sample-count : exact-positive-integer?
x-min : real?
x-max : real?
y-min : real?
y-max : real?

Makes a list of all the positions on the graph.

( zgrid f xs ys) → ( listof ( listof real? ))
f : ( real? real? . -> . real? )
xs : ( listof real? )
ys : ( listof real? )

Given a function that consumes x and y to produce z, a list of xs, and a list of ys, produces a list of z column values.

plot-view% : class?
superclass: object%

> ( send a-plot-view get-x-min ) → real?

> Returns the minimum plottable x coordinate.

> ( send a-plot-view get-y-min ) → real?

> Returns the minimum plottable y coordinate.

> ( send a-plot-view get-x-max ) → real?

> Returns the maximum plottable x coordinate.

> ( send a-plot-view get-y-max ) → real?

> Returns the maximum plottable y coordinate.

> ( send a-plot-view set-line-color color) → void?
> color : plot-color?

> Sets the drawing color.

> ( send a-plot-view set-line-width width) → void?
> width : real?

> Sets the drawing line width.

2d-view% : class?
superclass: plot-view%

Provides an interface to drawing 2-D plots. An instance of 2d-view% is created by plot, and the following methods can be used to adjust it.

> ( send a-2d-view set-labels |  | x-label |  |  |  |
> |  | y-label |  |  |  |
> |  | title) |  | → |  | void?

> x-label : string?
> y-label : string?
> title : string?

> Sets the axis labels and title.

> ( send a-2d-view plot-vector head tail) → void?
> head : ( vector/c real? real? )
> tail : ( vector/c real? real? )

> Plots a single vector.

> ( send a-2d-view plot-vectors vecs) → void?

> vecs

> :

> ( listof ( list/c ( vector/c real? real? )
> ( vector/c real? real? )))

> Plots a set of vectors.

> ( send a-2d-view plot-points points sym) → void?
> points : ( listof ( vector/c real? real? ))
> sym : ( or/c character? integer? symbol? )

> Plots points using a specified symbol. See points for possible values for sym

> ( send a-2d-view plot-line points) → void?
> points : ( listof ( vector/c real? real? ))

> Plots a line given a set of points.

> ( send a-2d-view plot-contours |  | grid |  |  |  |
> |  | xs |  |  |  |
> |  | ys |  |  |  |
> |  | levels) |  | → |  | void?

> grid : ( listof ( listof real? ))
> xs : ( listof real? )
> ys : ( listof real? )
> levels : ( listof real? )

> Plots a grid representing a 3-D function using contours to distinguish levels.

> ( send a-2d-view plot-shades |  | grid |  |  |  |
> |  | xs |  |  |  |
> |  | ys |  |  |  |
> |  | levels) |  | → |  | void?

> grid : ( listof ( listof real? ))
> xs : ( listof real? )
> ys : ( listof real? )
> levels : ( listof real? )

> Plots a grid representing a 3-D function using shades to show levels.

3d-view% : class?
superclass: plot-view%

Provides an interface to drawing 3-D plots. An instance of 3d-view% is created by plot3d, and the following methods can be used to adjust it.

> ( send a-3d-view plot-surface xs ys zs) → void?
> xs : ( listof real? )
> ys : ( listof real? )
> zs : ( listof real? )

> Plots a grid representing a 3d function in a 3d box, showing only the top of the surface.

> ( send a-3d-view plot-line xs ys zs) → void?
> xs : ( listof real? )
> ys : ( listof real? )
> zs : ( listof real? )

> Plots a line in 3-D space.

> ( send a-3d-view get-z-min ) → real?

> Returns the minimum plottable z coordinate.

> ( send a-3d-view get-z-max ) → real?

> Returns the maximum plottable z coordinate.

> ( send a-3d-view get-alt ) → real?

> Returns the altitude (in degrees) from which the 3-D box is viewed.

> ( send a-3d-view get-az ) → real?

> Returns the azimuthal angle.

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