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

[Kai Torben Ohlhus]

Update of bug #61674 (project octave):

                Category:                    None => Interpreter            
                Priority:              5 - Normal => 3 - Low                
                  Status:                    None => Need Info              

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Follow-up Comment #1:

On my Linux system I cannot observe this difference with Octave 7.  deconv is
marginal slower than conv.


>> N = 10; conv_t = nan(N,1); for j = 1:N; tic; num = 1; for i = 1:50; num =
conv (num, [1 -1]); end; conv_t(j) = toc; end; mean(conv_t)
ans = 3.2459e-03

>> N = 10; deconv_t = nan(N,1); for j = 1:N; tic; den = num; for i = 1:50; den
= deconv (den, [1 -1]); end; deconv_t(j) = toc; end; mean(deconv_t)
ans = 4.2221e-03


Did you overwrite one of those functions?  What is the output for


>> which conv
'conv' is a function from the file
/usr/share/octave/7.0.1/m/polynomial/conv.m
>> which deconv
'deconv' is a function from the file
/usr/share/octave/7.0.1/m/polynomial/deconv.m


If nobody else can confirm this issue, or a reason for this unique behavior
can be identified, this issue is likely to be closed soon.


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