[Octave-patch-tracker] [patch #10119] functions sumsqr, sumabs, meansqr, meanabs

[Nicholas Jankowski]

URL:
  <https://savannah.gnu.org/patch/?10119>

                 Summary: functions sumsqr, sumabs, meansqr, meanabs
                 Project: GNU Octave
            Submitted by: nrjank
            Submitted on: Fri 08 Oct 2021 11:51:03 AM EDT
                Category: Core : new function
                Priority: 5 - Normal
                  Status: In Progress
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

attached are matlab compatible implementations of the functions sumsqr,
sumabs, meansqr, and meanabs.  they are all fairly similar in behavior and
were introduced in matlab <2010.  After some input handling, they all just
call elementwise sqr or abs followed by sum or mean over all elements to
return a scalar, skipping over anything failing an isfinite() test. 

I noticed there are sumsq and meansq functions that were probably introduced a
long time ago that are not compatible with the matlab sumsqr and meansqr
functions. their behavior is different enough it's probably worth keeping the
separate functions rather than just modifying the octave functions, since the
names don't match anyway. (similar to what was done with repelem and
repelems). 

Of note these functions can handle numeric, char, and logical inputs, as well
as arbitrarily shaped cell arrays of the same.  

I did verify that these functions work with complex inputs, whereas the matlab
functions error for any complex valued inputs, and Octave's meansq & sumsq
functions produce odd results with complex values. (meansq appears to ignore
complex numbers, sumsq appears to apply sum((abs(Z))^2) )

will generate and a patch once i have a number.




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File Attachments:


-------------------------------------------------------
Date: Fri 08 Oct 2021 11:51:03 AM EDT  Name: sumsqr.m  Size: 4KiB   By: nrjank
Matlab compatible functions
<http://savannah.gnu.org/patch/download.php?file_id=52072>
-------------------------------------------------------
Date: Fri 08 Oct 2021 11:51:03 AM EDT  Name: meanabs.m  Size: 5KiB   By:
nrjank
Matlab compatible functions
<http://savannah.gnu.org/patch/download.php?file_id=52073>
-------------------------------------------------------
Date: Fri 08 Oct 2021 11:51:03 AM EDT  Name: sumabs.m  Size: 4KiB   By: nrjank
Matlab compatible functions
<http://savannah.gnu.org/patch/download.php?file_id=52074>
-------------------------------------------------------
Date: Fri 08 Oct 2021 11:51:03 AM EDT  Name: meansqr.m  Size: 5KiB   By:
nrjank
Matlab compatible functions
<http://savannah.gnu.org/patch/download.php?file_id=52075>

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