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jlssoft
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Hp prime error x^(1/3)

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Hp Prime

Hi.

 

The HP prime returns an erroneous result when evaluating the function x ^ (1/3) for the value x = -1

 

captura3.png

 

captura2.png

 

The result of the last operation is -8/3 and is within the field of real numbers.

 

Configuration CAS

 

captura1.png

 

I have the latest firmware version of 2016.

 

Thanks

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Maké
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Hi!, @jlssoft:

 

See, my answer in the post ... https://h30434.www3.hp.com/t5/Calculators/plotting-x-1-3/m-p/5890086/highlight/true#M7031

Try, with ...

Blue = real number part

Red = Imaginary number part

 

IMG_20161212_144031.jpg

 

IMG_20161212_144117.jpg

 

In comparison with Wolfram Alpha ... http://www.wolframalpha.com/input/?i=cubic+root+of+x

IMG_20161212_144705.jpg

 

Refer to : https://h30434.www3.hp.com/t5/Calculators/plotting-x-1-3/m-p/5890086/highlight/true#M7031

Kind Regards !.
Have a nice day !.
@Maké (Technical Advisor Premium - HP Program Top Contributor).
Provost in HP Spanish Public Forum ... https://h30467.www3.hp.com/

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BartdB
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Hi

 

Please see Cyrille's answer in the following link :

plotting x^(1/3)

 

-Bart
_________________________________________________________
calculator enthusiast
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Maké
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Hi!, @jlssoft:

 

See, my answer in the post ... https://h30434.www3.hp.com/t5/Calculators/plotting-x-1-3/m-p/5890086/highlight/true#M7031

Try, with ...

Blue = real number part

Red = Imaginary number part

 

IMG_20161212_144031.jpg

 

IMG_20161212_144117.jpg

 

In comparison with Wolfram Alpha ... http://www.wolframalpha.com/input/?i=cubic+root+of+x

IMG_20161212_144705.jpg

 

Refer to : https://h30434.www3.hp.com/t5/Calculators/plotting-x-1-3/m-p/5890086/highlight/true#M7031

Kind Regards !.
Have a nice day !.
@Maké (Technical Advisor Premium - HP Program Top Contributor).
Provost in HP Spanish Public Forum ... https://h30467.www3.hp.com/

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jlssoft
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Thank you very much for your attention.


Your explanation helped me a lot. I discovered that I had a very long time wrong with respect to the equivalence X ^ (1/3) = cubic root.

 

Juan

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