MathGroup Archive 2001

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  • To: mathgroup at
  • Subject: [mg30072] Algorithm
  • From: Yannis.Paraskevopoulos at
  • Date: Thu, 26 Jul 2001 01:20:08 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

Hi all,

lately I've been trying to translate to mathematica the following 
algorithm and it seems that everything is horribly slow and frustrating 
to a degree that I think that your kind help will be necessary.

The algorithm goes like that:

1)define t_i=2*i/100 ,i=1,2,...,500
  and X_t0=X

2)for j=1,2,...,10,000

		a) generate x_i  from N(0.05,1),p_i from N(0,1) and  

		   let y_i be 0, with probability 0.9 and 1 with probability 
		b) calculate ln(X_t(i))=ln(X_t(i-1))+(x_i)+(y_i)*(p_i)
		c) for the smallest i<=500 such that ln(X_t(i))<=0 set 
			W_j=1-0.4*X_t(i). Otherwise W_j=0

3) calculate final=1-Sum[W_j/10,000, {j,1,10,000}]

any help will be much appreciated.

best regards


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