Sum in an ode45?

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Peter el 11 de Dic. de 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?

Jan el 11 de Dic. de 2011

What are "all Y(i)"?

Walter Roberson el 11 de Dic. de 2011

What does y(1) indicate in this context? Evaluation at y = 1 ? The first of set of subscripted variables?

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