Bug Hunting Session
Bug 40975 - Add "differentiation" function to Calc
Summary: Add "differentiation" function to Calc
Status: NEW
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Calc (show other bugs)
Version:
(earliest affected)
unspecified
Hardware: All All
: low enhancement
Assignee: Not Assigned
URL:
Whiteboard: VOTE
Keywords:
Depends on:
Blocks: Calc-Function
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Reported: 2011-09-17 15:30 UTC by Francisco
Modified: 2017-07-22 11:26 UTC (History)
0 users

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Description Francisco 2011-09-17 15:30:17 UTC
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: 
http://en.wikipedia.org/wiki/Numerical_differentiation

It could work *only* on cells with formulaes, in this way:

Supose
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.
Comment 1 Björn Michaelsen 2011-12-23 12:36:20 UTC Comment hidden (obsolete)
Comment 2 Vasco Alves 2013-11-22 10:11:51 UTC
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.
Comment 3 Francisco 2013-11-22 13:47:17 UTC
Hi Vasco,

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.)