On Wed, 2003-10-01 at 15:45, Ian Clarke wrote:
> On Wed, Oct 01, 2003 at 12:35:08PM -0700, Ian Clarke wrote:
> > Line 160:
> > 
> >             double pNotConnectFailedOrSearchFailed =
> >                     (1 - pConnectFailed) * (1- pSearchFailed);
> > 
> > My high-school math is a bit rusty, but shouldn't that be:
> > 
> >      ... =  1-(pConnectFailed+pSearchFailed);
> 
> Well, thinking about it  what is there is:
> 
> not(connectFailed) and not(searchFailed)
> 
> My suggested correction was:
> 
> not (connectFailed or searchFailed)
> 
> Which, if I am not mistaken, is the same thing.
> 
> So n/m.
> 
> Ian.

Well, actually p(CF or SF) = pCF + pSF - p(CF and SF), which is
what the existing code calculates:

In[1]:= 1-(pCF+pSF)
 
Out[1]= 1 - pCF - pSF
 
In[2]:= (1-pCF)*(1-pSF)
 
Out[2]= (1 - pCF) (1 - pSF)
 
In[3]:= %//Expand
 
Out[3]= 1 - pCF - pSF + pCF pSF
 
In[4]:=

-- Ed Huff

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