Re: detrend() in Matlab and Octave

[Ben Abbott]

On Dec 22, 2010, at 6:27 PM, Sergei Steshenko <address@hidden> wrote:
> --- On Wed, 12/22/10, Ben Abbott <address@hidden> wrote:
> 
>> From: Ben Abbott <address@hidden>
>> Subject: Re: detrend() in Matlab and Octave
>> To: "H W Borchers" <address@hidden>
>> Cc: address@hidden
>> Date: Wednesday, December 22, 2010, 3:12 PM
>> On Dec 22, 2010, at 1:23 PM, H W
>> Borchers wrote:
>> 
>>> The 'detrend()' functions in Matlab and Octave provide
>> quite different
>>> functionality:
>>> 
>>> Matlab: Removes a constant or linear trend between
>> given breakpoints.
>>> 
>>> Octave: Removes a trend of order n from the whole
>> sequence.
>>> 
>>> What is the reason for this varied behavior?
>>> 
>>> Hans Werner
>> 
>> I'm not sure I understand the context of your question. But
>> I'll take a shot. I'll assume you are referring to the
>> documented features of Matlab's implementation of detrend
>> that Octave does not support?
>> 
>> Compatibility with Matlab wasn't always a high priority for
>> Octave development. As a result, there remain some functions
>> that are not fully compatible.
>> 
>> The most likely reason Octave's detrend is not fully
>> compatible is because no one is aware of the problem, or no
>> one has invested the effort to fix it.
>> 
>> If you'd like to see the compatibility of detrend fixed,
>> please file a bug report ...
>> 
>>     https://savannah.gnu.org/bugs/?group=octave
>> 
>> Or better yet, If you are particularly motived, please
>> submit a patch.
>> 
>> Ben
>> 
> 
> The existing Octave 'detrend' should then remain with a different name -
> because it has features the Matlab one doesn't have.
> 
> Regards,
>  Sergei.

No need. There isn't an inherent incompatibility for the differing features.

Ben