How are editors supposed to know the difference between transpose operators and character arrays?

Question

leka0024 2023-6-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1990303-how-are-editors-supposed-to-know-the-difference-between-transpose-operators-and-character-arrays

编辑： James Tursa 2023-6-30

采纳的回答： Matt J

在 MATLAB Online 中打开

For example, with

B = A1 + A2' + A3 + A4'

I am seeing the second half of the RHS highlighted oddly because the editor thinks it's forming a character array.

Wouldn't it be very helpful (and obvious) to allow a different operator to do transposes?? You could always do the PITA way of defining separate variables for each transpose you want to do, but that defeats the point of defining the operator in the first place and you might as well just use transpose() then.

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leka0024 2023-6-30

编辑：leka0024 2023-6-30

@Steven Lord even better point, thanks. (Although I wasn't proposing to do away with ' as transpose, just to allow users to define an alternate.)

The MATLAB extension for VS Code gets the highlighting correct, so perhaps somehow the jupyter-matlab-proxy group could see how the extension team was able to do it. The ideal thing would be for these two projects to merge into one ultimate tool for MATLAB coding: Notebooks in VS Code. :)

James Tursa 2023-6-30

编辑：James Tursa 2023-6-30

在 MATLAB Online 中打开

I haven't found the apostrophe ' operator to be an issue particularly. But there can be ambiguities with the .' operator with regards to where the period belongs. E.g., in the following:

2i^3.'

Does the period belong with the 3 making the apostrophe ' a ctranspose? Or does the period belong with the .' making it a straight transpose operator? You can run it to see ...

2i^3.'
ans = 0.0000 - 8.0000i
2i^(3.)'
ans = 0.0000 + 8.0000i
(2i^3).'
ans = 0.0000 - 8.0000i

So MATLAB pairs the period with the operator and not the number in this case. Of course, in this particular case if you wanted the ctranspose there is no reason to have the period at all:

2i^3'
ans = 0.0000 + 8.0000i

But my point is you sometimes may need to be careful how you write code with the dot operators such as .' to make the code intent clear to the reader.

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Answer 1

Matt J 2023-6-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1990303-how-are-editors-supposed-to-know-the-difference-between-transpose-operators-and-character-arrays#answer_1265453

编辑：Matt J 2023-6-30

在 MATLAB Online 中打开

A cheezy, but compact way you could define an alternative ctranspose operator (temporarily, within a particular workspace) is with a user-defined object that overloads mpower,

classdef myclass
   methods
       function out=mpower(base,obj)
           out=ctranspose(base);
       end
   end
end % class

>> T=myclass;

>> A=reshape(1:12,3,4)

A =

1 4 7 10

2 5 8 11

3 6 9 12

>>A^T

ans =

1 2 3

4 5 6

7 8 9

10 11 12

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Answer 2

Matt J 2023-6-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1990303-how-are-editors-supposed-to-know-the-difference-between-transpose-operators-and-character-arrays#answer_1265438

This seems to offer Jupyter Lab integration in a way that preserves Matlab syntax highlighting,

https://github.com/mathworks/jupyter-matlab-proxy

though I cannot find an example there of what happens with A' and A.' expressions.

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leka0024 2023-6-30

Thanks @Matt J , I am indeed using jupyter-matlab-proxy, that is the first screenshot above (with Jupyter Lab 3.6, they mention on the repo that highlighting is not yet supported on JL v4).

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