matrix (math) not diplayed correctly on Kobo

[fdread]

Hello,

I am reading some mathematic books on Kobo Libra Colour.

While the matrices are displayed correctly in Calibre viewer, they appear as "single line" on Kobo reader. Here is an example:

Original matrix:
[ 1 2
2 0
3 1]

Would appear on Kobo as [122031], with no space/newline,...
Making it impossible to interpret...

I tried with ePub or KePub, no difference.

Is there anything I could try to fix that?

Thanks in advance for your ideas.

[PeterT]

The important question is "What is the code in the book that is being used to display the matrix".

If it's easier, share the name of the book and maybe one of the forum readers can track down a copy (or preview if it's a purchased book) and explore it

Sent from my Pixel 7a using Tapatalk

[fdread]

Originally Posted by PeterT

The important question is "What is the code in the book that is being used to display the matrix".

Here is the code:

<p class="uln-indent"><math xmlns:m="http://www.w3.org/1998/Math/MathML" class="calibre2"><mrow class="calibre2"><mrow class="calibre2"><mo class="calibre2">[</mo><mrow class="calibre2"><mtable class="calibre2"><mtr class="calibre2"><mtd class="calibre2"><mn class="calibre2">1</mn></mtd><mtd class="calibre2"><mn class="calibre2">2</mn></mtd></mtr><mtr class="calibre2"><mtd class="calibre2"><mn class="calibre2">2</mn></mtd><mtd class="calibre2"><mn class="calibre2">0</mn></mtd></mtr><mtr class="calibre2"><mtd class="calibre2"><mn class="calibre2">3</mn></mtd><mtd class="calibre2"><mn class="calibre2">1</mn></mtd></mtr></mtable></mrow><mo class="calibre2">]</mo></mrow></mrow></math></p>
...
.calibre2 {
  text-indent: 0;
  word-break: break-word;
  word-wrap: break-word;
}

While capturing the code from Calibre editor, I noticed that the "previewer" is also exhiting the display issue. [122031]

[PeterT]

Are you doing this in ePub OR kepub format? I don't belive that the ePub reader on Kobo supports mathml. (I see you answered this in the original post; sorry)

You also might want to check the calibre editor sub forum for mathml; for instance I cam across this today --> https://www.mobileread.com/forums/sh...d.php?t=362517

[salamanderjuice]

MathML only works for Kepubs.

This code works fine on my Kobo Libra Colour:

<p><math display="block" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mo stretchy="true" form="prefix">[</mo><mtable><mtr><mtd columnalign="center"><mn>1</mn></mtd><mtd columnalign="center"><mn>2</mn></mtd></mtr><mtr><mtd columnalign="center"><mn>2</mn></mtd><mtd columnalign="center"><mn>0</mn></mtd></mtr><mtr><mtd columnalign="center"><mn>3</mn></mtd><mtd columnalign="center"><mn>1</mn></mtd></mtr></mtable><mo stretchy="true" form="postfix">]</mo></mrow><annotation encoding="application/x-tex">\begin{bmatrix}
 1 &amp; 2 \\[0pt]
 2 &amp; 0 \\[0pt]
 3 &amp; 1 \\[0pt]
\end{bmatrix}</annotation></semantics></math></p>

Is this a book you bought or generated? I'm not sure if there is an easy fix if this is a problem throughout.

[fdread]

Originally Posted by salamanderjuice

MathML only works for Kepubs.

This code works fine on my Kobo Libra Colour:

<p><math display="block" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mo stretchy="true" form="prefix">[</mo><mtable><mtr><mtd columnalign="center"><mn>1</mn></mtd><mtd columnalign="center"><mn>2</mn></mtd></mtr><mtr><mtd columnalign="center"><mn>2</mn></mtd><mtd columnalign="center"><mn>0</mn></mtd></mtr><mtr><mtd columnalign="center"><mn>3</mn></mtd><mtd columnalign="center"><mn>1</mn></mtd></mtr></mtable><mo stretchy="true" form="postfix">]</mo></mrow><annotation encoding="application/x-tex">\begin{bmatrix}
 1 &amp; 2 \\[0pt]
 2 &amp; 0 \\[0pt]
 3 &amp; 1 \\[0pt]
\end{bmatrix}</annotation></semantics></math></p>

Is this a book you bought or generated? I'm not sure if there is an easy fix if this is a problem throughout.

Thanks! I confirm your example works on my device as well.
Not sure there is an easy conversion path... still researching.

Big thanks anyway!

[fdread]

Experimenting:
adding a single

<semantics>

tag, it fixes all the mathML entries in the chapter.
NB: if I add the corresponding closing tag

</semantics>

, it breaks again...

I am a bit lost....but it works...