Re: quad will be removed in a future release of MATLAB

[Tatsuro MATSUOKA]

> From: Tatsuro MATSUOKA <address@hidden>

> To: Rik <address@hidden>
> Cc: "address@hidden" <address@hidden>
> Date: 2014/7/15, Tue 13:08
> Subject: Re: quad will be removed in a future release of MATLAB
> 
>> From: Rik 
>> To: Tatsuro MATSUOKA  
>> Cc: octave-maintainers
>> Date: 2014/7/15, Tue 00:24
>> Subject: Re: quad will be removed in a future release of MATLAB
>> 
>> 
>> On 07/14/2014 03:44 AM, address@hidden wrote:
>> 
>> Subject:  quad will be removed in a future release of MATLAB 
>>> From:  Tatsuro MATSUOKA <address@hidden> 
>>> Date:  07/14/2014 12:43 AM 
>>> To:  "address@hidden" <address@hidden> 
>>> List-Post:  <mailto:address@hidden> 
>>> Content-Transfer-Encoding:  quoted-printable 
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>>> Reply-To:  Tatsuro MATSUOKA <address@hidden> 
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>>> Message:  4 
>>> 
>>> This is information. I found that the description for quad in MATLAB 
> online help http://www.mathworks.co.jp/jp/help/matlab/ref/quad.html?lang=en 
> quad 
> will be removed in a future release. Use integral instead. MATLAB ingegral: 
> http://www.mathworks.co.jp/jp/help/matlab/ref/integral.html?lang=en Regards 
> Tatsuro 
> This is a known change.  Matlab isn't doing away with the functionality, 
> just renaming the function from quad to integral1.  Most people aren't 
> familiar with the name numerical quadrature for integration so the quad 
> naming 
> convention (quad, dblquad, triplequad) hasn't been particularly helpful.
>> 
>> See the Savannah bug report
>     (https://savannah.gnu.org/bugs/?func=detailitem&item_id=42037).  This 
> has also been entered as an easy project on the Octave Wiki 
> (http://wiki.octave.org/Short_projects).
>> 
>> --Rik 
>> 
> 
> 
>> just renaming the function from quad to integral1
> 
> Perhaps you know the below but I describe the difference in implementation of 
> Numerical Integration between MATLAB and octave
> 
> There is no integral1 but integral on MATLAB 2014a.
> MATLAB integral seem to be not just renaming the function from quad to 
> integral.
> 
> q = integral(fun,xmin,xmax,Name,Value)
> 
> 
> http://www.mathworks.co.jp/jp/help/matlab/ref/integral.html?lang=en#btdd9y9
> 
> 
> 
> And also Octave quad is not equivalent to the Matlab quad.
> 
> Matlab quad tries to approximate the integral of function within an error of 
> 1e-6 using recursive adaptive Simpson quadrature. 
> 
> Octave quad comes from quadpack and it is Numerical integration based on 
> Gaussian quadrature.
> From algorithm point of view MATLAB quad seem to be similar to Octave quadv 
> that 
> is Numerical integration using an adaptive vectorized Simpson's rule
> 
> (http://www.gnu.org/software/octave/doc/interpreter/Functions-of-One-Variable.html#Functions-of-One-Variable)
> 
> MATLAB has 'Waypoints' methods that is not implemented in Octave.
> 
> The above is I have noticed looking into MATLAB help and Octave Manual
> 
> Tatsuro


I have committed to 
https://savannah.gnu.org/bugs/?func=detailitem&item_id=42037 slightly different 
way.

Tatsuro