Vincent Lefevre on Thu, 12 Jan 2023 12:42:02 +0100

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

On 2023-01-12 12:31:09 +0100, 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


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 <> - Web: <>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)