On 12/08/2020, 23:45, "Sven Schreiber" <sveto...@gmx.net> wrote:
Am 12.08.2020 um 19:12 schrieb Alecos Papadopoulos:
> Let X be a series of negative numbers. Then the command
>
> series Y = X^(1/3)
>
> (or any other "1/oddnumber" fractional power)
>
> returns a "Warning: pow: Domain error" message, overwrites series "Y"
> and returns a "no valid values" if one attempts to view the series.
>
> Why is this happening, considering that X^(1/3) is a real number even if
> X is a negative number?
Good question. I'm noticing that 'eval -1^(1/3)' works fine, in contrast.
--> I guess that's because exponentiation takes precedence over negation. 'eval
(-1)^(1/3)' results in NaN.
All the best
Jan
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