• To: mathgroup at christensen.cybernetics.net
• From: Andrew Cooke <ajc at reaxp01.roe.ac.uk>
• Date: Wed, 26 Jul 1995 00:51:44 -0400
• Organization: Institute for Astronomy, Royal Observatory Edinburgh

```	hi,

could any kind soul explain what the error

means?

it came from the following integral (it's supposed to be a
convolution of a log-gaussian and a power law)

In[26]:= ?f
Global`f

f[n_, s_, b_, x_] := (1*Exp[-(x^2/(2*s^2))])/(s*Sqrt[2*Pi]*n^b*10^(b*x))

In[26]:= Integrate[f[n,s,b,x],x]

1
Integrate[----------------, x]
2     2
b x  x /(2 s )
10    E
Out[26]= ------------------------------
b
n  Sqrt[2 Pi] s

In[27]:= Integrate[f[n,s,b,x],{x,-Infinity,Infinity}]

Out[27]= 0

this zero seems a bit strange too.  i assume that i am doing
something stupid (and that undersatnding the error message might
help).

thanks,
andrew

p.s. it's Mathematica 2.2 for Solaris

--
A.Cooke at roe.ac.uk  work phone 0131 668 8357  home phone/fax 0131 667 0208
institute for astronomy, royal observatory, blackford hill, edinburgh
http://www.roe.ac.uk/ajcwww

```

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