Re: [libreoffice-users] Calc Function Wizard - IF Result differences

At 14:36 19/10/2013 +0200, Hylton Conacher wrote:
> The initial formula is:
> =IF(0<G4<=$G$20,G4*$F$20,IF($G$20<G4<=$J$20,(G4-$G$20)*$I$20+($F$20*$G$20),IF($J$20<G4<=$M$20,(G4-$G$20-$J$20)*$L$20+(($G$20*$F$20)+($J$20*$I$20),IF($M$20<G4<=$P$20,(G4-$G$20-$J$20-$M$20)*$O$20+(($G$20*$F$20)+($J$20*$I$20)+($M$20*$L$20),IF(G4>$P$20,((G4-$G$20-$J$20-$M$20-$P$20)*$O$20+(($G$20*$F$20)+($J$20*$I$20)+($M$20*$L$20)+($O$20*$P$20))))))))))
>
> In addition I have tried changing the formula without success to try 
> and reduce the multiple nested IF functions:
> i.e.:
> =sum((IF(0<G4<=$G$20,G4*$F$20,0),(IF($G$20<G4<=$J$20,(G4-$G$20)*$I$20+($F$20*$G$20),0),(IF($J$20<G4<=$M$20,(G4-$G$20-$J$20)*$L$20+(($G$20*$F$20)+($J$20*$I$20),0),(IF($M$20<G4<=$P$20,(G4-$G$20-$J$20-$M$20)*$O$20+(($G$20*$F$20)+($J$20*$I$20)+($M$20*$L$20),0),(IF(G4>$P$20,((G4-$G$20-$J$20-$M$20-$P$20)*$O$20+(($G$20*$F$20)+($J$20*$I$20)+($M$20*$L$20)+($O$20*$P$20)),0)
>
> The SUMIF function was also tried but my brain just gave up.  I 
> cannot see how the VLOOKUP function will help either as I am not 
> looking up values from cells, I am calculating a single value in H4 
> based in a variable input in G4.  Have a peek at the uploaded 
> spreadsheet on Nabble:

You can do what you need using VLOOKUP(), seeking values from a small 
table (much as you already have in rows 58 to 61).  And you can 
probably more easily use MATCH(), which works fairly similarly, but 
returns a pointer instead of a value.  But both of these methods 
suffer from the problem that you need to seek multiple values from 
your table in each calculation, so the formulae become rather 
cumbersome, with a necessity to retrieve essentially the same 
information repeatedly.

It's worth saying that it's generally not a good idea to repeat 
similar information - as you have at lines 21 to 32.  Instead, either 
use values from a minimal table (as already mentioned) or embed the 
values in the formulae.

Let's redraw your table more simply - say in rows 71 to 74 of columns A and B:
        1.25
150     1.25
350     1.25
600     1.52
(Nothing is needed in A71.)

Then you can calculate what you need using something like:
=MIN(G4;$A$72)*$B$71
+MAX(0;(MIN(G4;$A$73)-$A$72)*$B$72)
+MAX(0;(MIN(G4;$A$74)-$A$73)*$B$73)
+MAX(0;(G4-$A$74)*$B$74)
where G4 is your sample data cell.

Each line of this formula (I've split it only for ease of reading, of 
course) calculates the contribution to the cost from one of the four 
price bands.  Each MIN() function ensures that the upper limit of the 
quantity is either the value itself or the upper limit of the band - 
whichever is smaller.  So where are the IFs to test which bands are 
needed?, you ask.  Well, each unnecessary contribution would be 
calculated here (wrongly) as negative, so the MAX() functions, with 
their first arguments of zero, cancel these incorrect 
contributions.  Try it: it gives the answers you want.

I trust this helps.

Brian Barker


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