Hello there,

I have a problem with a brand new spreadsheet, v 4.4.3.2, the sum version isn't recalculating, even if I press f9 (to force a recalculation)

Any blank cells are just that, blank, the values I expect to be summed are numeric, weirdly it works when the left-most column is positive. The leftmost column and the sum columns are being graphed.

Yet for the left column being greater than zero, all works fine.

I think there may be a dodgy optimisation in play and I'm happy to help you find it, first though has anyone ever dealt with it?

Reproducing:
The value cells are of the form:

if(t1+t2/60 < t, 0,  c e ^ -k(t-t1-t2/60) )

This is the result of solving the differential equation dThing / dt = -k Thing, where the thing happens instantaneously at time t1:t2 (t2 in minutes)

I'm then trying to sum over multiple events, but the sum column isn't updating for negative time, BUT the value column is.

Alec

Screenshot for proof.

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