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MathGroup Archive 1999

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Re: InputForm Query

  • To: mathgroup at
  • Subject: [mg19751] Re: InputForm Query
  • From: "David Bailey" <db at>
  • Date: Wed, 15 Sep 1999 03:53:03 -0400
  • Organization: University of Salford, Salford, Manchester, UK
  • References: <7redv6$>
  • Sender: owner-wri-mathgroup at

Brian Higgins <bghiggins at> wrote in message
news:7redv6$487 at
> I am using MathScript to post expression evaluated by the kernel into
> web pages. When the expressions are algebraically complex, I wrap the
> output from the kernel with InputForm. For example(a simple case),
> In[1]:=InputForm[1 + 7/13.*x^2]
> Out[1]//InputForm=
> 1 + 0.5384615384615385*x^2
> The question for the Mathgroup is whether there is a simple way to
> automatically truncate the numeric number(s) in the expression so that
> all numerical quantities are displayed with a specified number of
> digits. When the output from the kernel is purely numerical, then it is
> a simple matter to use NumberForm.
> Thanks much,

NumberForm will work on expressions, but it only acts as a wrapper - so you
do not see the effect in InputForm (which you need to flatten out your
exponents). One answer is to apply NumberForm to the expression and convert
to a string. Then if you convert this back you will have truncated the
number: For example:

NumberForm[1 + 7/13.*x^2, 4] // ToString // ToExpression // InputForm

1 + 0.5385*x

Maybe there is a neater way?

David Bailey

Salford Software

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