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plottools

ellipse

generate 2-D plot object for an ellipse

Calling Sequence

ellipse(c, a, b, opts)

Parameters

c

-

center of the ellipse

a

-

horizontal radius of the ellipse

b

-

vertical radius of the ellipse

opts

-

(optional) equations of the form option=value

Options

Any applicable 2-D plot option in plot/options can also be given.

filled : truefalse

Specifies whether to fill the inside of the ellipse. The default is false.

rotate = real

Specifies that ellipse should be be rotated by the specified angle (in radians). The default is 0.

super = positive real, list of two positive reals, or the value true

The super option given alone is equivalent to super=m (with m=4) which is equivalent to super=[m,m]. More generally ellipse([x0, y0], a, b, super=[m1,m2]) draws the superellipse (or generalized superellipse when m1m2)

xx0am1+yy0bm2=1

Description

The ellipse command creates a two-dimensional plot data object, which when displayed is an ellipse centered at c with radial distances a and b, that is, ellipse([x0, y0], a, b) draws the ellipse

xx02a2+yy02b2=1

The super option may be used to draw a superellipse or generalized superellipse.

The plot data object produced by the ellipse command can be used in a PLOT data structure, or displayed using the plots[display] command.

Remaining arguments are interpreted as options, which are specified as equations of the form option = value. For more information, see plottools and plot/options .

Examples

>

withplottools:

>

withplots:

Draw an ellipse described by the following equation,

>

a2:b3:x00:y00:

>

elliellipsex0,y0,a,b,filled=true,color=blue:

>

displayelli,scaling=constrained

which is equivalent (apart from the filled option) to:

>

eqxx02a2+yy02b2=1:

>

implicitploteq,x=4..4,y=4..4,scaling=constrained

Ellipse in arbitrary forms can be generated with object transformations such as rotate in the plots package.

>

displayrotateelli,π4

>

displayellipsesuper,scaling=constrained

>

ms13,12,23,1,32,2,3,5

ms13,12,23,1,32,2,3,5

(1)
>

displayseqellipsesuper=msi,legend=catm=,msi,color=Niagara i,i=1..nopsms,scaling=constrained

>

displayellipsesuper=15,3,color=DarkRed,ellipsesuper=2,5,color=DarkBlue,scaling=constrained

Compatibility

The super option was introduced in Maple 2019.

For more information on Maple 2019 changes, see Updates in Maple 2019 .

The plottools[ellipse] command was updated in Maple 2023.

The rotate option was introduced in Maple 2023.

For more information on Maple 2023 changes, see Updates in Maple 2023 .


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