[Octave-bug-tracker] [bug #62947] nextpow2 gives incorrect result for 0.5 <= x < 1

[Marco Caliari]

URL:
  <https://savannah.gnu.org/bugs/?62947>

                 Summary: nextpow2 gives incorrect result for 0.5 <= x < 1
                 Project: GNU Octave
               Submitter: caliari
               Submitted: Wed 24 Aug 2022 07:46:46 AM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: dev
         Discussion Lock: Any
        Operating System: Any


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Follow-up Comments:


-------------------------------------------------------
Date: Wed 24 Aug 2022 07:46:46 AM UTC By: Marco Caliari <caliari>
The following


nextpow2(0.5)


gives -0.5, while it should be -1. And


nextpow2(0.6)


gives 0.6 itself, while it should be 0 (and the same for any other value x,
0.5 < x < 1). What about something like


n = zeros (size (x));
idx = (x != 0);
n(idx) = ceil (log2 (abs (x(idx))));









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