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\lVert and \rVert are not rendered on '9.7.0.1190202 (R2019b)', Ubuntu 18.04

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Carlos Mendoza
Carlos Mendoza 2020-9-25
评论： Walter Roberson 2020-10-2
This line
xlabel('$\lVert x \rVert$', 'Interpreter', 'latex')
triggers this message
Warning: Error updating Text.
String scalar or character vector must have valid interpreter syntax:
$\lVert x \rVert$
and then label is rendered as "$\lVert x \rVert$", whithout the latex interpretation. \vert is rendered correctly.

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Walter Roberson
Walter Roberson 2020-9-25
Those are amsmath and that package is not included in MATLAB latex.
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Carlos Mendoza
Carlos Mendoza 2020-10-2
In the absence of an answer from the Staff and a clear statement on the official Matlab documentation, I would take this last comment of yours as the answer to my question :). Thanks.
Walter Roberson
Walter Roberson 2020-10-2
There are very few references to \usepackage in the documentation.
One of them could be read very broadly as hinting that possibly two packages are automatically included.
https://www.mathworks.com/help/matlab/matlab_prog/marking-up-matlab-comments-for-publishing.html#btga6k2-3
Notice the autogenerated latex has \usepackage{graphicx} \usepackage{color} even though the user did not put those in. That hints that maybe those packages are already included by Mathworks.
But in practice, I have never been able to use the color definition facility of the color package... as if the package is in fact not included.

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