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  1. /* Exponential.c 
  2. Routines related to the exponential probability distribution.
  3. Also see: Binomial.c, ChiSquare.c, Normal.c, Uniform.c
  4. */
  5. double ExponentialPdf(double x);
  6.  
  7. double ExponentialPdf(double x)
  8. /* Mean and variance are 1. */
  9. {
  10.     if(x<0.0)return 0.0;
  11.     else return exp(-x);
  12. }
  13.