\lVert and \rVert are not rendered on '9.7.0.1190202 (R2019b)', Ubuntu 18.04
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Carlos Mendoza
el 25 de Sept. de 2020
Comentada: Walter Roberson
el 2 de Oct. de 2020
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
el 25 de Sept. de 2020
Those are amsmath and that package is not included in MATLAB latex.
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Walter Roberson
el 2 de Oct. de 2020
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.
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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