b2f:

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   Return the float number corresponing to the binary representation 
   of bval.

   Since version 7.
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   Form:
   [fval] = b2f(bval,bounds,bits)
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   ------
   Inputs
   ------ 
   bval              the binary representation of the number
   bounds            the bounds on the variables 
   bits              the number of bits to represent each variable
  
   -------
   Outputs
   -------
   fval              the float representation of the number

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