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The error message is below: I am trying to compute the ISI by deriving the vector, and it's encased in a try/except clause, so no worries if it fails. Is there a way to silence this warning?
I searched the NEURON forums, but couldn't find something on this topic. Thanks.

Suggest verifying that the Vector contains at least two elements before calling the Vector class's deriv method.

Oh, duh. Thank you.