Sum in an ode45?

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Peter
Peter am 11 Dez. 2011
I have the following differnetial equation
dy(1) = a*y(1)/N
where N is the sum of all the Y(i) at a given moment of time, not just at the beginning. How can I input this into ode45?
  2 Kommentare
Jan
Jan am 11 Dez. 2011
What are "all Y(i)"?
Walter Roberson
Walter Roberson am 11 Dez. 2011
What does y(1) indicate in this context? Evaluation at y = 1 ? The first of set of subscripted variables?

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