[Octave-bug-tracker] [bug #61098] Function `size` changed in Matlab R2019b

[Kai Torben Ohlhus]

URL:
  <https://savannah.gnu.org/bugs/?61098>

                 Summary: Function `size` changed in Matlab R2019b
                 Project: GNU Octave
            Submitted by: siko1056
            Submitted on: Wed 01 Sep 2021 02:35:13 PM JST
                Category: Octave Function
                Severity: 4 - Important
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: Confirmed
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: dev
         Discussion Lock: Any
        Operating System: Any

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Details:

The `size` function can be called in new ways since Matlab R2019b:

> Starting in R2019b, you can also specify dim as a vector of positive
integers to query multiple dimension lengths at a time. For example, size(A,[2
3]) returns the lengths of the second and third dimensions of A in the 1-by-2
row vector szdim.

https://www.mathworks.com/help/matlab/ref/size.html


sz = size(A)
szdim = size(A,dim)
szdim = size(A,dim1,dim2,…,dimN)
[sz1,...,szN] = size(___)


This change seems reasonable to me and mostly backward compatible.

Non-existing dimensions get filled up with "1"s, as the example illustates:


>> A = eye (3);
>> size (A, 4,2,3,1)

ans =

     1     3     1     3

>> size (A, [4,2,3,1])

ans =

     1     3     1     3


However this is a very elementary function and Octave should adapt soon.





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