te')); return $arr; } /* 遍历用户所有主题 * @param $uid 用户ID * @param int $page 页数 * @param int $pagesize 每页记录条数 * @param bool $desc 排序方式 TRUE降序 FALSE升序 * @param string $key 返回的数组用那一列的值作为 key * @param array $col 查询哪些列 */ function thread_tid_find_by_uid($uid, $page = 1, $pagesize = 1000, $desc = TRUE, $key = 'tid', $col = array()) { if (empty($uid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('uid' => $uid), array('tid' => $orderby), $page, $pagesize, $key, $col); return $arr; } // 遍历栏目下tid 支持数组 $fid = array(1,2,3) function thread_tid_find_by_fid($fid, $page = 1, $pagesize = 1000, $desc = TRUE) { if (empty($fid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('fid' => $fid), array('tid' => $orderby), $page, $pagesize, 'tid', array('tid', 'verify_date')); return $arr; } function thread_tid_delete($tid) { if (empty($tid)) return FALSE; $r = thread_tid__delete(array('tid' => $tid)); return $r; } function thread_tid_count() { $n = thread_tid__count(); return $n; } // 统计用户主题数 大数量下严谨使用非主键统计 function thread_uid_count($uid) { $n = thread_tid__count(array('uid' => $uid)); return $n; } // 统计栏目主题数 大数量下严谨使用非主键统计 function thread_fid_count($fid) { $n = thread_tid__count(array('fid' => $fid)); return $n; } ?>java - MathML to LaTeX conversion - Stack Overflow

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    java - MathML to LaTeX conversion - Stack Overflow

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    I'm trying to figure out how to convert a MathML representation of a math equation and convert it to the LaTeX representation of that math equation. So for example...

    <math>
  <mrow>
    <mfrac>
      <mrow><mi>x</mi></mrow>
      <mrow><mi>y</mi></mrow>
    </mfrac>
  </mrow>
</math>

    ... is a simple stacked fraction and it's LaTeX representation would be...

    \frac{x}{y}

    I'm guaranteed that the MathML has no presentational markup because I am constructing the MathML string dynamically and I control how/where the MathML elements are inserted; the MathML string is just pure structure of the math equation.

    So my question is, are there any Java/JavaScript libraries out there that can take a MathML input string, like the one above, and generate the corresponding LaTeX string? I would much rather not have to write this parser myself. If not Java/JavaScript, are any libraries at all that can do this?

    If not, any suggestions on how to approach this problem of writing my own parser? Where to start, things to consider, resources, etc...?

    UPDATE

    Thanks to Optimal Cynic, I was able to use this Java library to do what I want. It is not perfect however, but I can easily modify it and make it work well. However, I would still like to see this done in JavaScript. So are there any tools like this written in JavaScript? If not, I'll resort to translating it myself.

    Note: I am using MathJax to render the MathML on the page, but MathJax does not currently support a way to go from MathML to LaTeX. It can only go from LaTeX to MathML.

    I'm trying to figure out how to convert a MathML representation of a math equation and convert it to the LaTeX representation of that math equation. So for example...

    <math>
  <mrow>
    <mfrac>
      <mrow><mi>x</mi></mrow>
      <mrow><mi>y</mi></mrow>
    </mfrac>
  </mrow>
</math>

    ... is a simple stacked fraction and it's LaTeX representation would be...

    \frac{x}{y}

    I'm guaranteed that the MathML has no presentational markup because I am constructing the MathML string dynamically and I control how/where the MathML elements are inserted; the MathML string is just pure structure of the math equation.

    So my question is, are there any Java/JavaScript libraries out there that can take a MathML input string, like the one above, and generate the corresponding LaTeX string? I would much rather not have to write this parser myself. If not Java/JavaScript, are any libraries at all that can do this?

    If not, any suggestions on how to approach this problem of writing my own parser? Where to start, things to consider, resources, etc...?

    UPDATE

    Thanks to Optimal Cynic, I was able to use this Java library to do what I want. It is not perfect however, but I can easily modify it and make it work well. However, I would still like to see this done in JavaScript. So are there any tools like this written in JavaScript? If not, I'll resort to translating it myself.

    Note: I am using MathJax to render the MathML on the page, but MathJax does not currently support a way to go from MathML to LaTeX. It can only go from LaTeX to MathML.

    • java
    • javascript
    • latex
    • xml-parsing
    • mathml
    Share Improve this question edited May 23, 2017 at 12:34 CommunityBot 11 silver badge asked Jul 5, 2011 at 19:32 HristoHristo 46.5k67 gold badges168 silver badges234 bronze badges 2
    • 1 If you ever implement this in JavaScript, be sure to share a link to the implementation here. – Mikko Rantalainen Commented Apr 23, 2013 at 7:34
    • @Mikko... will do, and I'll probably open source it – Hristo Commented Apr 23, 2013 at 7:34
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    3 Answers 3

    Reset to default 5

    Try http://www.tilman.de/programme/mathparser/anleitung_en.html - it's written in Java and the source is available.

    What's wrong with XSLT, SAX parsers, or DOM parsers?

    Bindings for SAX and DOM parsers exist for all major languages (and pretty much every other language too). I would remend DOM parsing using a functional language, but tastes differ.

    XSLT is a functional language designed for processing XML.

    I had similar problem and mathparser provided in url from question wasn't working for me at all.

    I converted MathML to LaTeX by using XSLT MathML Library with Saxon-HE but since XSLT MathML library is pure XSLT any XSLT transformation tool should handle it. Output is not always perfect but it gave me better results than web-xslt mentioned somewhere at stackexchange network.

    Command line usage with saxon:

    saxon -o output.tex input.mml xsltml_2.1.2/mmltex.xsl

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