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A few answers


   A few answers to various problems:
   
   To Axel Kowald, who wanted to use FindRoot and NIntegrate.  The 
following will alleviate the problem:
   FindRoot[Evaluate[NIntegrate[N[r x], {x,0,3}]==9], {r,1}]
   
   It balks about non-numerical at... but the correct answer is produced.
   
   To Doug Burkhardt:
   
   Matrix multiplication is accomplished using .
   
   a.b will matrix multiply to matrices.  The answer is sometimes 
transposed from the traditional way of viewing matrices but it is correct.  
BTW, a b will multiply each entry of a by the corresponding entry of b.
   
   To Chris:
   
   To turn off the speling errors message, issue the following command:
   Off[ General::spell, General::spell1 ]
   
   A good place to put this command is in the init.m file in your 
Mathematica directory.
   
   Hope these help,
   Daryl



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