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MathGroup Archive 2007

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Re: Latex and \sum

  • To: mathgroup at smc.vnet.net
  • Subject: [mg77072] Re: Latex and \sum
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Sat, 2 Jun 2007 04:23:20 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <f3of1o$ong$1@smc.vnet.net>

Martin Grossman wrote:
> Hi there,
> 
> In Mathematica 6 I am having trouble using command
> ToExpression["input", TeXForm].
> I want to use LaTex sign sum : \sum
> When I used ToExpression["\\sum _{i=a}^b x_i",TeXForm] it doesnt work.
> Other symbols like \frac{}{}  work... Any solution?
> 
> Thanks
> martin grossman
> 

The issue, though that does not solve the problem, seems to be related 
to the way Mathematica parses the "i=a" part.

In[1]:= ToExpression["\\sum_{i}^b x_i", TeXForm]

Out[1]= Sum[Subscript[x, i], {i, 1, b}]

In[2]:= ToExpression["\\sum_{i=1}^b x_i", TeXForm]

During evaluation of In[2]:= ToExpression::esntx:Could not parse \
\sum_{i=1}^b x_i as Mathematica input.

Out[2]= $Failed

In[3]:= ToExpression["\\sum_{a}^b x_i", TeXForm]

Out[3]= b*Subscript[x, i]

In[4]:= ToExpression[ToString[\sum _ {n = 1}^m n^2], TeXForm]

During evaluation of In[4]:= ToExpression::esntx:Could not parse \sum \
_{n=1}^m n^2 as Mathematica input.

Out[4]= $Failed

In[5]:= ToExpression[
  ToString[\frac {(x + y)^2} {\sqrt {x y}}], TeXForm]

Out[5]= (x + y)^2/Sqrt[xy]

Regards,
Jean-Marc


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