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geometry[foci] - find the foci of an ellipse or a hyperbola
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Calling Sequence
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foci(fn, f)
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Parameters
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fn
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(optional) list of two names
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f
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ellipse or hyperbola
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Description
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The routine returns a list of two foci of the given ellipse or hyperbola f.
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If the first optional argument fn is given, the names of the two foci are the two elements of the list fn.
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See help pages for hyperbola and ellipse for definitions of the foci.
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Use routine detail for more details on the foci.
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The command with(geometry,foci) allows the use of the abbreviated form of this command.
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Examples
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![[foci_1_e1, foci_2_e1]](/support/helpjp/helpview.aspx?si=5891/file04111/math87.png)
| (1) |
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![map(coordinates, [foci_1_e1, foci_2_e1])](/support/helpjp/helpview.aspx?si=5891/file04111/math91.png)
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![[[1, -2-3^(1/2)], [1, -2+3^(1/2)]]](/support/helpjp/helpview.aspx?si=5891/file04111/math94.png)
| (2) |
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![foci([f1, f2], e1)](/support/helpjp/helpview.aspx?si=5891/file04111/math98.png)
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![[f1, f2]](/support/helpjp/helpview.aspx?si=5891/file04111/math101.png)
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![[f1, f2]](/support/helpjp/helpview.aspx?si=5891/file04111/math108.png)
| (4) |
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![map(coordinates, [f1, f2])](/support/helpjp/helpview.aspx?si=5891/file04111/math112.png)
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![[[1, -2-3^(1/2)], [1, -2+3^(1/2)]]](/support/helpjp/helpview.aspx?si=5891/file04111/math115.png)
| (5) |
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Download Help Document
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