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Question: Sums and products over a list of Values ERRORs

Question:Sums and products over a list of Values ERRORs

AJmaristchem 5
student
May 16 2013
1

Hello I am working on a Physical Chemsitry problem and Am haveing trouble evaluateing a statistical mechanics approach to calulating entropy. I have defined a list Z that contains 12 values for a variable that is used to descirbe a state. The sum:


sum((ln(1-exp(Z[i]/T)),i=1..12)

is supposed to give me the entropy of a system with those 12 possible states (T is Temperature which is to be entered later) When i try to evaluate this (where the value that changes is defined by a list) does not evaluate. If i wirte out this code with "Sum.." so it does not evaluate it gives me the correct expression.

If anyone has any help or suggestions on how to rectify this I would be forever in your debt.  

AJ  
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