Re: probable bug of "ispower" function in GP: FALSE, apologies!

Vincent Lefevre <[email protected]>
Newsgroups gmane.comp.mathematics.pari.devel
Message-ID <[email protected]> 
On 2023-01-12 12:31:09 +0100, [email protected] wrote:
> I misunderstood the definition of "ispower"!
> 
> I wanted a function that identify directly if some integer is a power of 2

I suppose that you can use something like

  ispower(64,,&n)

and check that n is 2. But I suppose that for large numbers, this may
be inefficient because ispower() will not just check for powers of 2.

-- 
Vincent Lefèvre <[email protected]> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
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