Mathematical Formulae

Hi there,

unlike other wikis that have Latex rendering, the deki syntax forces you to escape the \ operator each time, so a simple equation which in dokuwiki and normal latex would look like:

\alpha = \beta + \gamma

in dekiwiki you'd have to write:

\\alpha = \\beta + \\gamma

this is a major disadvantage since it's no longer possible to simply cut and paste formulas between latex documents and dekiwiki!

Is here a way that you could could fix the syntax to allow for "normal" latex to render properly without having to manually escape the \ characters?

Thanks,

YJ

YJ,
You can already do what you desire. Instead of using the {{ math.formula() }} syntax, use the "transformations" approach as shown in http://wiki.developer.mindtouch.com/MindTouch_Deki/FAQ/Page_Management/How_do_I...Use_the_Transformations%2f%2fTransform_Content_menu_item%3f:

1) Enter your raw latex markup (with no extra backslashes.)
2) Select the text, change the style to "formatted"
3) Open the transformations menu (the small gear button in the editor toolbar) and select "math.formula" edited 05:32, 3 Jul 2008

We were very careful to follow all instructions on this page for Windows Server 2003. We rebooted. This is the error on the page when we tried using the math extension:

MindTouch.Deki.Script.DekiScriptInvokeException: function 'Formula' failed
<?xml-stylesheet type='text/xsl' href='/@api/host/resources/error.xslt'?>
<error>
<status>400</status>
<title>Bad Request</title>
<message>latex misconfigured or missing</message>
<uri>https://aetdwiki.gsfc.nasa.gov/@api/deki/services/default/51/Formula</uri>
</error>
<?xml-stylesheet type='text/xsl' href='/@api/host/resources/error.xslt'?>
<error>
<status>400</status>
<title>Bad Request</title>
<message>latex misconfigured or missing</message>
<uri>https://aetdwiki.gsfc.nasa.gov/@api/deki/services/default/51/Formula</uri>
</error>
at MindTouch.Deki.Script.DekiScriptRuntime.<Invoke>d__0.MoveNext()
at MindTouch.Dream.Coroutine.Iterate(IEnumerator`1 coroutine, TaskEnv env, Action`1 completion)
at System.SysUtil.Rethrow(Exception exception)
at MindTouch.Dream.ResultBase.Confirm()
at MindTouch.Dream.Result`1.Wait()
at MindTouch.Deki.Script.DekiScriptCall.Evaluate(DekiScriptEnv env)
at MindTouch.Deki.Script.Dom.DekiScriptDomExpr.Evaluate(DekiScriptEvalContext context, XmlNode parent, DekiScriptEnv env)

@jonverve the error indicates that the "latex-path" config key is either not set or is not pointing to the LaTex application

Had a hard time installing this and getting it to work -- a good alternative is here: http://developer.mindtouch.com/User:SteveB/Sandbox/MathML

Just download the .js file to your wiki and point the Template:ASCIIMathML to that, works great!

I'm testing this latex extension and it's working quite fine. Only thing is that the start and end conditions of e.g. sum and product are not shown under and above the signs but instead are placed as super and subscript right next to the sum and product signs, which makes reading rather difficult if the formula is a bit complex. Other latex implementations don't have this 'problem'. Is there a way to fix this?

@Kire this "problem" is unfortunately the desired behavior with this add-on because it is replacing what you type in between single $ in a latex document. @mindtouch: A better solution in general would be placing it between \begin{equation*} \end{equation*}. A short workaround to this is using $ in your equation yourself. so you start your equation with a $ which will end the mindtouch equation template and than you can use any latex command (well only basic ones and amslatex ones at this point), so e.g. \begin{equation} YOUR equation \end{equation} and at the end you again have to use a single $ to end the other side and get a correct latex file. This will then output a numbered equation with the desired behavior, Kire.

I'm looking for some help to get this function working. Here is the current error I get on the page:

MindTouch.Deki.Script.DekiScriptInvokeException: function 'Formula' failed ---> System.IO.FileNotFoundException: Could not find file "/tmp/a34cfa4d-f915-0463-3319-4551474ea7bb.png".
at System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, Boolean anonymous, FileOptions options) [0x00000]
at System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share) [0x00000]
at (wrapper remoting-invoke-with-check) System.IO.FileStream:.ctor (string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare)
at System.IO.File.Open (System.String path, FileMode mode, FileAccess access, FileShare share) [0x00000]
at System.IO.File.ReadAllBytes (System.String path) [0x00000]
at MindTouch.Deki.Services.MathService.Formula (System.String formula) [0x00000]
at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (object,object[])
at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000]
--- End of exception stack trace ---
at MindTouch.Deki.Script.DekiScriptRuntime.Invoke(XUri uri, DekiScriptLiteral args, DekiScriptEnv env, Result`1 result)
at MindTouch.Deki.DekiWikiService.GetPageContents(DreamContext context, DreamMessage request, Result`1 response)
--- End of coroutine stack trace ---
--- End of inner exception stack trace ---
at MindTouch.Deki.Script.DekiScriptRuntime+<Invoke>d__0.MoveNext () [0x00000]
at MindTouch.Tasking.Coroutine.Invoke (System.Func`1 invocation) [0x00000]
--- End of exception stack trace ---
at MindTouch.Deki.Script.DekiScriptRuntime.Invoke(XUri uri, DekiScriptLiteral args, DekiScriptEnv env, Result`1 result)
at MindTouch.Deki.DekiWikiService.GetPageContents(DreamContext context, DreamMessage request, Result`1 response)
--- End of coroutine stack trace ---

The permissions on /tmp
drwxrwxrwt 7 root root 4096 Apr 4 17:05 tmp

(SE is disabled btw)
# cat /etc/sysconfig/selinux
SELINUX=disabled
SELINUXTYPE=targeted

Noticed that this extension has some fixed setting for width so the pngs get a newline in them (if you know what I mean) for a long formula, even though the formula may fit on the page. How do I change this width to 100% or unlimited, etc?

Hi, I wrote an extension to call MathJax, which may be of help to you guys.

It adds a Transformation to the editor (mathjax.formula). Optionally the Extension {{ mathjax.equation(equation: "your_equation") }} can be used. MathML an TeX is supported; the math expressions are rendered in JavaScript and can be Cut&Paste to MathML or TeX compliant aplications such as word, openoffice. FireMath on Firefox can be used to WYSIWYG edition.

MathJax must be installed. Eventually you'll need to change the MathJax path on the script accordingly.
Cheers.


<extension>
<title>MathJax</title>
<namespace>mathjax</namespace>
<function>
<name>equation</name>
<description>This will add a MathJax equation</description>
<param name="equation" type="str">MathML or TeX equation</param>
<return>
<html xmlns:eval="http://mindtouch.com/2007/dekiscript">
<head></head>
<body>
<script type="text/javascript" src="/var/www/dekiwiki/skins/common/mathjax/MathJax.js?config=TeX-AMS-MML_HTMLorMML"> </script>
<script type="text/javascript"> document.write(<eval:js>args.equation</eval:js>); </script>
</body>
<tail></tail>
</html>
</return>
</function>
<function transform="pre">
<name>formula</name>
<description>Format a MathML or Tex equation</description>
<param name="formula" type="str">MathML or TeX equation text</param>
<return>
<html xmlns:eval="http://mindtouch.com/2007/dekiscript">
<head></head>
<body>
<script type="text/javascript" src="/var/www/dekiwiki/skins/common/mathjax/MathJax.js?config=TeX-AMS-MML_HTMLorMML"> </script>
<script type="text/javascript"> document.write(<eval:js>$formula</eval:js>); </script>
</body>
<tail></tail>
</html>
</return>
</function>
</extension>