On 8 July 2012 15:39, Mike Miller <mtmil...@ieee.org> wrote:
> On Fri, Jul 6, 2012 at 7:20 PM, Sergei Steshenko <sergst...@yahoo.com> wrote:
>> Hello,
>>
>> here is a quick example:
>>
>> "
>> octave:43> [y, xm] = rceps([1 2 3 4]);
>> octave:44> xm
>> xm =
>>
>> 3.98049 3.01913 2.01951 0.98087
>>
>> octave:45> [y, xm] = rceps([1 2 3 4 5]);
>> octave:46> xm
>> xm =
>>
>> 4.9244 3.7654 1.5151
>>
>> octave:47>
>>
>> ".
>>
>> In the second case 'xm' has just 3 elements, though it is supposed to have 5.
>
> Hi Sergei, I agree I think this is a bug. Moving to octave-dev list.
>
> Can someone with ML signal toolbox please send back the results of:
>
> [y, xm] = rceps ([1, 2, 3, 4])
> [y, xm] = rceps ([1, 2, 3, 4, 5])
> [y, xm] = rceps ([0])
> [y, xm] = rceps ([1])
Finally I got access to MatLab to test this. Here's what happens there:
>> [y, xm] = rceps ([1, 2, 3, 4])
y =
1.2688 0.4024 0.2291 0.4024
xm =
3.9805 3.0191 2.0195 0.9809
>> [y, xm] = rceps ([1, 2, 3, 4, 5])
y =
1.5073 0.4078 0.1926 0.1926 0.4078
xm =
4.9610 3.8710 3.3114 1.8518 1.0048
>> [y, xm] = rceps ([0])
Error using rceps (line 36)
The Fourier transform of X contains zeros. Therefore, the real
cepstrum of X does not exist.
>> [y, xm] = rceps ([1])
y =
0
xm =
1
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