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Why won't the prime graph correctly?
05-23-2019, 06:21 PM (This post was last modified: 05-23-2019 06:24 PM by Gilles.)
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RE: Why won't the prime graph correctly?
(05-23-2019 03:42 PM)Nigel (UK) Wrote:  
(05-23-2019 09:14 AM)Aries Wrote:  Quite the contrary, teachers know very well what they are teaching, calculators are stupid and/or badly programmed Wink
Best,

Aries Smile
I suppose different people have different opinions. Here are what the four calculators with me at school (I teach Physics) today say:
  • DM42: doing 1 +/- ENTER 3 1/x y^x gives the first complex cube root of -1, rather than -1.
  • WP34S: doing 1 +/- ENTER 3 1/x y^x gives DOMAIN ERROR.
  • Casio Classwiz fx-85GTX: doing (-1)^(1/3) gives -1.
  • HP Prime: (-1)^(1/3) gives an error in Home mode (only integral powers of negative numbers allowed) and a complex result in CAS mode.
I like all of these calculators and I think they behave well.

Nigel (UK)

WolframAlpha gives the same complex result as does the HP50g, newRPL, HPPrime (in home mode,set allow complex number). There is a bug in the NSpire here
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RE: Why won't the prime graph correctly? - Gilles - 05-23-2019 06:21 PM



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