Dwell Time does not handle case of when all dwell times are 1 for a symbol

[Saqibm128]

r_diff evaluates as 1 for all elements, which yields a zero length array.

we should handle this as an edge case

[makism]

good catch 👍🏻

I think something like that could work:

if len(symbols) == 1:
    raise Exception("explanation here")

what do you think?

feel free open a PR, otherwise, I will tackle it ;)

[Saqibm128]

Check and see if this is what you wanted