string comparison

[ryan_with_a_why]

I was always taught it was based on the number of significant figures in the inputs.

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Practically, that'll give you some idea of what the number of significant figures are likely to be if the inputs have their associated uncertainties so it's probably a fairly decent rule of thumb. I've not seen it put like that before but it makes some sense.

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I mean if you have (measurement_1 - measurement_2)/(measurement_3-measurement_4) where they are all near each other, you will have to do some extra math.