[Octave-bug-tracker] [bug #61674] deconv much slower than conv

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?61674>

                 Summary: deconv much slower than conv
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Tue 14 Dec 2021 10:41:01 PM UTC
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Performance
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 7.0.90
         Discussion Lock: Any
        Operating System: GNU/Linux

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Details:


tic
num = 1;
for i = 1:50
  num = conv (num, [1 -1]);
end
toc

tic
den = num;
for i = 1:50
  den = deconv (den, [1 -1]);
end
toc


 deconv takes 10 to 15 times as long as conv, for multiple polynomials and
powers.




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