Well, I was thinking last night about this feature. And I think it could be very useful.
For those who don't know what I'm talking about:
It could work *only* on cells with formulaes, in this way:
A1 = 5
B1 = 6
C1 = 2.5
D1= A1*B1^2*ln(C1) = 164.93....
then, one could add de "diff" function
A2 = diff(D1,A1) = 32.99 (becase the result should be the evaluation of B1^2*ln(C1))
B2 = diff(D1,B1) = 54.98 (because the result should be 2*A1*B1*ln(C1)
and so on...
And it doesn't need to end there, there could be higher order derivatives, for example
B3 = diff(D1,B1,2) = 9.16 (= 2*A1*ln(C1) )
C3 = diff(D1,C1,3) = 3.84 (2*A1*B1/C1^3)
What do you think? I'm one of those who would like to have this feature a lot.
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The bug definitely still persists. I don't know if this would be a feasible thing to do, and it's not really high priority (Excel doesn't have it AFAIK), but it would be nice to have.
Feasible, I gess it is, though now I don't know how good is for the entire comunity of LibreOffice Calc, divided the efforts it requires, with respect of course to other feateures requeted.
I think it could be useful, for people how works with this kind of math but none else. When I got this idea, I never though about this. I'm lowering the priority of this enhancement request.
(Anyway, I would not like to close it (not even as won't fix), because it could happen, some day, that somebody with the skills, could see it and try to implement it, just because he wants/need it.)