Difference between revisions of "Type Command"
From GeoGebra Manual
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;Type( <Object> ) | ;Type( <Object> ) | ||
| − | For conics and quadrics this command returns a number representing the conic/quadric type according to the table below. In this context empty conic (or quadric) is one where all coefficients are defined, but the conic (quadric) contains no points, e.g. x<sup>2</sup>+y<sup>2</sup>=-1 | + | For conics and quadrics this command returns a number representing the conic/quadric type according to the table below. In this context empty conic (or quadric) is one where all coefficients are defined, but the conic (quadric) contains no points, e.g. x<sup>2</sup>+y<sup>2</sup>=-1. For conics GeoGebra distinguishes double line (special case of parallel lines with distance 0) and single line (special case of circle with infinite diameter, may result from circle inversion). For quadrics there is no such distinction. |
:{{example|1=<code><nowiki>Type(x²+y²=1)</nowiki></code> yields 4 which stands for circle.}} | :{{example|1=<code><nowiki>Type(x²+y²=1)</nowiki></code> yields 4 which stands for circle.}} | ||
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!|Value | !|Value | ||
| − | !| | + | !|Type of conic |
| − | !| | + | !|Type of quadric |
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|1 | |1 | ||
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|7 | |7 | ||
|Double line | |Double line | ||
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|8 | |8 | ||
Revision as of 17:38, 31 May 2022
- Type( <Object> )
For conics and quadrics this command returns a number representing the conic/quadric type according to the table below. In this context empty conic (or quadric) is one where all coefficients are defined, but the conic (quadric) contains no points, e.g. x2+y2=-1. For conics GeoGebra distinguishes double line (special case of parallel lines with distance 0) and single line (special case of circle with infinite diameter, may result from circle inversion). For quadrics there is no such distinction.
- Example:
Type(x²+y²=1)yields 4 which stands for circle.
| Value | Type of conic | Type of quadric |
|---|---|---|
| 1 | Single point | Single point |
| 2 | Intersecting lines | |
| 3 | Ellipse | Ellipsoid |
| 4 | Circle | Sphere |
| 5 | Hyperbola | Hyperboloid |
| 6 | Empty | Empty |
| 7 | Double line | |
| 8 | Parallel lines | |
| 9 | Parabola | Paraboloid |
| 10 | Line | Line |
| 30 | Cone | |
| 31 | Cylinder | |
| 33 | Plane | |
| 34 | Parallel planes | |
| 35 | Intersecting planes | |
| 36 | Hyperboloid one sheet | |
| 37 | Hyperboloid two sheets | |
| 38 | Parabolic cylinder | |
| 39 | Hyperbolic cylinder | |
| 40 | Hyperbolic paraboloid |
