2016b provides an answer to the operation [1 2 3 4 5].' + [1 2 3 4] whereas 2015b indicates 'Matrix dimensions must agree'. 2016b's behaviour is not clearly documented. Is it correct?

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Craig 2016-6-29

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https://ww2.mathworks.cn/matlabcentral/answers/292810-2016b-provides-an-answer-to-the-operation-1-2-3-4-5-1-2-3-4-whereas-2015b-indicates-matrix

关闭： MATLAB Answer Bot 2021-8-20

2016b

a=1:5
a =
       1     2     3     4     5
K>> b=1:4
b =
       1     2     3     4
K>> a.' + b
ans =
       2     3     4     5
       3     4     5     6
       4     5     6     7
       5     6     7     8
       6     7     8     9

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Answer 1

Walter Roberson 2016-6-29

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/292810-2016b-provides-an-answer-to-the-operation-1-2-3-4-5-1-2-3-4-whereas-2015b-indicates-matrix#answer_227079

You are using R2016a Preview, which had that (undocumented) behaviour as a test; it did not make it into R2016a official release.

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Craig 2016-6-29

Thanks Walter.

Walter Roberson 2016-6-29

Wait, are you using R2016a Preview, or R2016b Preview? What you describe was present in R2016a Preview and was removed for full release. If you are talking about R2016b Preview, then that is something that cannot be discussed here (the Non-Disclosure Agreement does not permit public discussion of the preview releases.)