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MathGroup Archive 1994

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real number -> scientific C like string

  • To: mathgroup at christensen.cybernetics.net
  • Subject: real number -> scientific C like string
  • From: schnoerr at ipesgi.e-technik.uni-stuttgart.de (Claudius Schnoerr)
  • Date: Fri, 21 Oct 1994 10:06:11 +0200 (MDT)

Dear Mathgroupers,

I need a conversion of a real number to a string containing that number
in scientific and C-like format:

Example:

In[1]:= CForm[2345.67 10^7]
Out[1]//CForm= 2.34567e10
In[2]:= ToString[CForm[2345.67 10^7]] // FullForm
Out[1]//FullForm= "2.34567e10"

This is the desired result, but this will not work with smaller exponents:

In[3]:= a = 0.002345
Out[3]= 0.002345
In[4]:= ToString[CForm[a]]
Out[4]= 0.002345

This is not in scientific notation. Another try:

In[4]:= ScientificForm[a]
                                -3
Out[4]//ScientificForm= 2.345 10
In[5]:= CForm[ScientificForm[a]]
Out[5]//CForm= ScientificForm(0.002345)

Yet another try:

In[6]:= NumberForm[{a}, ExponentFunction->(#&)]
                             -3
Out[6]//NumberForm= {2.345 10  }
In[7]:= CForm[NumberForm[{a}, ExponentFunction->(#&)]]
Out[7]//CForm= NumberForm(List(0.002345),
    Rule(ExponentFunction,Function(Slot(1))))

Has anybody an idea ?  Please e-mail to me.

-- 

---------------------------------------------------------------------
Claudius Schn"orr              Institut f"ur Physikalische Elektronik      
                               Universit"at Stuttgart
                               Pfaffenwaldring 47
Tel: ++49-711-685-7168         70569 Stuttgart
FAX:             -7143
e-mail:schnoerr at ipesgi.e-technik.uni-stuttgart.de
---------------------------------------------------------------------






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