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Student Support Forum: 'Ellipsoid iteration limit' topicStudent Support Forum > General > Archives > "Ellipsoid iteration limit"

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Simon
02/22/12 07:40am

I'm using Manipulate on an Ellipsoid, but I ran into a problem when the principal axes are some permutation of the Identity matrix (times a positive constant):


this does not work:
Needs["MultivariateStatistics`"]
Graphics3D[{
Ellipsoid[
{0,0,0},
{1,1,1},
{
{1,0,0},
{0,1,0},
{0,0,1}
}
]
}]

it gives error:
$IterationLimit::itlim: Iteration limit of 4096 exceeded.


Theese work:
Graphics3D[{
Ellipsoid[
{0, 0, 0},
{1, 1, 1},
{
{1,$MachineEpsilon, 0},
{1, 0, 0},
{0, 0, 1}
}
]
}]

Graphics3D[{
Ellipsoid[
{0,0,0},
{1,1,1},
{
{1,0,0},
{0,1,0},
{0,0,1}
}*-1
]
}]

Note that the same holds under corresponding condititions in 2-dimensional case.

Knowing I only have positive ri a workaround was to do:
Graphics3D[{
Ellipsoid[x,-r,-d]
}]


I'm not sure if I'm using the syntax incorrectly or if this is a bug.




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