| 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, luis.gallardo@math.cnrs.fr 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 <vincent@vinc17.net> - Web: <https://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)