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Re: delayed function assignment

• To: mathgroup at smc.vnet.net
• Subject: [mg88189] Re: delayed function assignment
• From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
• Date: Sun, 27 Apr 2008 07:01:17 -0400 (EDT)
• Organization: The Open University, Milton Keynes, UK
• References: <fv1fec$eru$1@smc.vnet.net>

leigh wrote:
> Dear Mathgroup,
> 
> I am trying to integrate the pdf of a chi-square mixture distribution.
> If I define the pdf as
> 
> pdf2[0] := .25
> \!\(pdf2[x] :=  .5*\(\(1/2\^\(1/
>         2\)\)\/Gamma[1/2]\) \(x\^\(1/2 - 1\)\) \[ExponentialE]\^\(\(-x
> \)/
>               2\) +  .25*\(1\/\(2*Gamma[1]\)\) \[ExponentialE]\^\(\(-x
> \)/2\)\)
> 
> I can then obtaing the cumulative distribution function symbolically
> as
> 
> In[14]:=\!\($B"i(Bpdf2[x] \[DifferentialD]x\)
> 
> Out[14]=\!\(\(-0.25`\)\ 2.718281828459045`\^\(\(-0.5`\)\ x\) + 0.5`\ \
> Erf[0.7071067811865476`\ \@x]\)
> 
> I can get numerical values using for example
> 
> In[31]:=\!\(1 -  .25 - $B"i(B\_0\%12 pdf2[x] \[DifferentialD]x\)
> 
> Out[31]=0.000885691
> 
> However if I try to define this as a function of the statistic
> obtained, say
> 
> \!\(cum2[x] := 1 -  .25 - $B"i(B\_0\%x pdf2[t] \[DifferentialD]t\)
> 
> Then
> 
> In[33]:=cum2[9]
> 
> Out[33]=cum2[9]
> 
> Doesn't evaluate. What should I do to obtain the value as output.
> 
> Thanks for your help
> 
> Leigh
> 

Hi Leigh,

I believe you are using a version prior to 6.0, you should use the 
_InputForm_ when copying an expression from a Mathematica notebook to an 
email client: select the cell(s) you want to include in your email, then 
within the *Cell* menu select either *Convert To* or *Display As* and 
choose *InputForm*. Finally, copy and paste as usual.

As posted, I was not able to copy and past without error some 
expressions (using Thunderbird email/newsreader client or Google Groups 
web interface on Mac OS X).

Regards,
-- Jean-Marc