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MathGroup Archive 2007

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Re: problem with parsing InputForm scientific notation (eg. 3.`*^-7)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg80593] Re: problem with parsing InputForm scientific notation (eg. 3.`*^-7)
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Sun, 26 Aug 2007 23:07:00 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <fara85$4jd$1@smc.vnet.net>

Chris Chiasson wrote:

> Can anyone confirm this report?
> 
> Steps to reproduce:
> 1. Enter "3.`*^-7" (without quotation marks) into an Input cell and evaluate it.
> 2. Go back to the Input cell, put your cursor at the beginning and
> enter "RealDigits["
> 3. Hit the End key, type "]" and then re-evaluate the cell, which by
> now reads "RealDigits[3.`*^-7]", but don't enter that directly.
> 
> I have encountered other errors where InputForm messes up the syntax
> checker, but I haven't been able to make a small reproducible example
> like this one.
> 
> Version 6.0.1 on MS Windows XP SP2

Here is what I got on my system after step 3:

In[2]:= RealDigits[3.`*^-7]

During evaluation of In[2]:= Syntax::sntxf: "3.*" cannot be followed \
by "^-7".

During evaluation of In[2]:= Syntax::tsntxi: "^-7" is incomplete; \
more input is needed.

During evaluation of In[2]:= Syntax::sntxi: Incomplete expression; \
more input is needed.

In[2]:= $Version

Out[2]= "6.0 for Microsoft Windows (32-bit) (June 19, 2007)"

-- 
Jean-Marc


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