Student Support Forum: 'RootReduce[] is buggy (Win98, Mma 3.0.1.1x)' topicStudent Support Forum > General > Archives > "RootReduce[] is buggy (Win98, Mma 3.0.1.1x)"
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Comment/Response |
Shawn Cokus
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 01/21/00 08:43am
From a clean slate (Windows 98, Mathematica 3.0.1.1x):
SetOptions[Root, ExactRootIsolation->True];
RootReduce[1-Root[(#^4 - 2) &, 1]^2]
...gives the error: ''General::ivar : Sqrt[2] is not a valid variable.'' (But answer 1-Sqrt[2] is correct.)
From a clean slate (Windows 98, Mathematica 3.0.1.1x):
SetOptions[Root, ExactRootIsolation->True];
RootReduce[1-Root[(#^4 + 1) &, 1]^2]
...gives the error: ''Part::partd : Part specification I[[2]] is longer than depth of object.'' (But answer 1-I is correct.)
Given that ExactRootIsolation->True is supposed to make things completely *rigorous* (and is necessary once the algebraic degrees get high enough), these obvious errors inside RootReduce[] or Root[] or other internals are not encouraging, to say the least.
I guess I'm expecting to hear whether this behavior is a reproducible bug by others, and what the status of the problem is: will it ever affect the correctness of the result?
Thanks,
--Shawn.
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