There are two types of MathML, Presentation MathML and Content MathML.
Presentation MathML is a markup for formatting expressions, similar to
LaTeX. Content MathML has some knowledge of the mathematical
expressions they represent. Content MathML is easier to parse to SymPy
because it represents an expression tree. Most LaTeX -> MathML
converters convert to Presentation MathML, since LaTeX is itself a
presentation language.
To convert to SymPy, you really need any kind of expression tree, or
AST. Converting from that to SymPy would just be a matter of walking
the syntax tree and converting it to Python. Content MathML is a good
choice for this, but so would many other formats (like a Lisp
expression, or some internal format in the Javascript). Presentation
MathML and LaTeX are poorer choices, because they don't represent
mathematical expressions, they represent 2D rendering of symbols. So
for example, if you have x + y, you want something that represents
that as an Add node with "x" and "y" subnodes. LaTeX represents this
as the string "x + y". But you can also have nonsense LaTeX
expressions, like "x + / ^ -" or "\frac{+}{3}". These are valid LaTeX
because they represent a valid 2D rendering, but they aren't valid
math because there are operators (nodes) that don't have proper syntax
(e.g., the + "operator" should have a left and right child,
mathematically it doesn't make sense by itself in a fraction).
LaTeX is also bad because it's very easy to be ambiguous with it (like
"\sin xy", which could mean sin(x*y) or sin(x)*y). While you could
probably be careful and only generate unambiguous LaTeX, you still
have to reparse that into its own expression tree anyway, in order to
do the conversion to SymPy. With that being said, it is useful for an
equation editor to be able to export to LaTeX, so you can get the
exact representation of what you inputted.
Note that unless you design the equation input system so that it's
impossible to enter invalid expressions (e.g., when you enter ∫ it
immediately requires you to enter an expression and a variable), you
will have to have some way to translate from "presentation" to
"content".
Aaron Meurer
On Fri, Mar 11, 2016 at 7:21 AM, Aman Deep <amandeep1...@gmail.com> wrote:
> If I am able to convert the latex expression to MathML.
> Will it be easier to parse MathML to sympy expression?
>
> Here Is something I found which converts latex to MathML.
> https://www.mathtowebonline.com/
>
> On Friday, 11 March 2016 17:20:48 UTC+5:30, Aman Deep wrote:
>>
>> I have asked them about it on their irc channel
>> irc://irc.freenode.net/mathquill
>> Waiting for their reply.. Meanwhile I am trying to make latex work with
>> sympy.
>>
>> Thanks.
>>
>> On Friday, 11 March 2016 16:01:17 UTC+5:30, Francesco Bonazzi wrote:
>>>
>>>
>>>
>>> On Thursday, 10 March 2016 22:58:09 UTC+1, Aman Deep wrote:
>>>>
>>>> I was able to use mathquill inside jupyter notebook using html &
>>>> javascript.
>>>>
>>>> Here is the code.
>>>> http://nbviewer.jupyter.org/gist/hiamandeep/52ccdce87c40fb021048
>>>>
>>>
>>> Excellent.
>>>
>>>>
>>>> So, If I skip the latex part then what should be my approach to convert
>>>> text in input area to sympy expression?
>>>
>>>
>>> Have a look at this conversation:
>>> https://github.com/mathquill/mathquill/issues/456
>>>
>>> Otherwise, you could try to parse the javascript expression tree of
>>> mathquill.
>>>
>>> Try to contact the mathquill developers, maybe they can better advise us.
>
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