support for columnspan and rowspan attributes
Alexander Krutik
Are there any plans to add support for columnspan and rowspan
attributes in MathJax?
http://www.w3.org/Math/testsuite/build/main/Presentation/TablesAndMatrices/mtable/mtableBspan3-full.xhtml
(This is not a bug report because I think Davide is aware of this. He
is the one who made the tests of MathJax for w3.org.)
But, anyway, since MathJax don't yet support elementary math
functions, all elementary math which shows the addition of numbers (of
equations) in a vertical form have to be set up using mtables. It
would be very useful to have the support for columnspan and rowspan. I
have to resort to nested tables every time I need columnspan or
rowspan.
Alex
leathrum
input syntax, MathJax is somewhat constrained by the fact that
standard TeX/LaTeX tables and arrays are described using tab stops and
line breaks, so colspans and rowspans are only possible with nested
tables. The more interesting question, then, is getting colspans and
rowspans when using the MathML input jax (and, say, the HTML/CSS
output jax). I should point out that browser support still isn't very
good for this -- my browser (FF9 in Ubuntu, so native MML) didn't
render the tables in your test page correctly, the column of 2's
didn't span the rows as indicated in the sample rendering but instead
showed as 4 distinct lines in a single table (the second line had a 2
and two blank spaces).
As for rendering elementary math, like aligning digits in vertical
form addition, the W3C mathML WG gave a lot of thought to this kind of
thing in drafting the MML3 spec. I recall an extensive (and
fascinating) discussion of how to lay out long division, for example.
I'm not sure MathJax has brought those new features into its MathML
input jax yet, though.
On Jan 31, 9:19 am, Alexander Krutik <krutik.alexan...@gmail.com>
wrote:
>
> Are there any plans to add support for columnspan and rowspan
> attributes in MathJax?
>
Davide P. Cervone
> attributes in MathJax?
It is certainly something that we'd like to support, but there are no
immediate plans to add it to the HTML-CSS output (For NativeMML
output, it is up to the browser whether it is supported or not). Once
v2.0 is out, we will begin prioritizing the next round of features and
enhancements. Finishing the table support is certainly one
possibility there.
> (This is not a bug report because I think Davide is aware of this. He
> is the one who made the tests of MathJax for w3.org.)
Yes, I am aware of the deficiency.
> But, anyway, since MathJax don't yet support elementary math
> functions, all elementary math which shows the addition of numbers (of
> equations) in a vertical form have to be set up using mtables. It
> would be very useful to have the support for columnspan and rowspan. I
> have to resort to nested tables every time I need columnspan or
> rowspan.
Support for the elementary math constructs is also another possibility
for future work. It all depends on what the community and the
supporters are willing to back, either through their own code
contributions, or financial support to have me do the coding.
Davide
leathrum
the aforementioned MathML WG discussion about laying out long division
-- shows several variants, generally variants taught in different
countries (e.g. one shows the numerals in Arabic).
http://cs.jsu.edu/~leathrum/division.png
Before seeing this image, I was familiar with perhaps 2 of the 10
layouts shown. The headings on the displays are strings the WG used
for "longdivstyle" attribute values to select the different layouts.
See the MathML3 spec, section 3.6.2. TeX has very little support for
this sort of thing, so we shouldn't expect much from the TeX input jax
to MathJax in this regard.
Davide P. Cervone
http://groups.google.com/group/mathjax-users/browse_thread/thread/561b040757e5b722
Something similar could be done for other long division forms. The
code pretty terrible, but it is not impossible to make it work.
Davide
leathrum
doesn't have everything filled in -- copied from a College Algebra
worksheet):
\[
\begin{array}{cccccc}
&\ x^2&&&&\\
\cline{2-6}
x^2-2x+3&\vline\ x^4&+3x^3&+0x^2&-4x&+5\\
&x^4&-2x^3&+3x^2&&\\
\cline{2-4}
&&5x^3&-3x^2&-4x&\\
&&&&&\\
\cline{3-5}
&&&&&\\
&&&&&\\
\cline{4-6}
&&&&&
\end{array}
\]
The alignment is good, but the division bar isn't quite right. It
would be pretty dicey for long division of numbers unless you could
squash things together.
On Feb 3, 2:47 pm, "Davide P. Cervone" <d...@union.edu> wrote:
> I did some examples of some hacks for doing polynomial division at
>
Marc-gmail
Davide P. Cervone
looking for something with more natural spacing of the polynomials.
Otherwise, sure.
Davide
leathrum
full circle, because implementing \cline would probably require a
combination of horizontal rules and colspans.
Davide P. Cervone
being implemented.
Davide
David Carlisle
> If you are talking about tables and arrays in MathJax's TeX/LaTeX
> input syntax, MathJax is somewhat constrained by the fact that
> standard TeX/LaTeX tables and arrays are described using tab stops and
> line breaks, so colspans and rowspans are only possible with nested
> tables.
standard latex tables and arrays support column spanning via
\multicolumn. Row spanning is a bit harder in TeX but the multirow
package provides a de facto standard markup for row spans.
David