That doesn't work correctly. . The reason I am doing this is that D16:D23
represents 7 separate costs items which have 1 of three esclation factors.
These three factors are epxressed in $B$27:$B$29. I want to be able to use
the index function to search out this variable for all 7 cost items and then
escalate these 7 items and add them together in the one formula. This is why
I am using the SUMPRODUCT. As written, the index applies one rate to all
seven numbers. I in fact have three separate rates which do not get applied
using this methodology.

EM

"Teethless mama" wrote:

=SUMPRODUCT((D16:D23)*(1+INDEX($B$27:$B$29,MATCH(F 16,$A$27:$A$29,0),1))^((B$1-E16)/365))


"ExcelMonkey" wrote:

I am using an index function to escaltate a value in real terms. For example:

RealValue * (1 + rate)^N = Nominal Value

Or as below

D16*(1+INDEX($B$27:$B$29,MATCH(F16,$A$27:$A$29,0), 1))^((B$1-E16)/365)

Or better defined as:

Real*(1+INDEX(list of escalation
types,row,column)^((currentdate-basedate)/365days)

D16 is the real value and everything else is the escalation.

This works fine. Problem I am having is that I now want to incorporate this
into an array formula. So instead of trying to find the nominal value of
D16. I want to find the nominal values of D16:D23. I am attempting to do so
by incorporating the INDEX function into a SUMPRODUCT function. I was trying
to incorporate it as follows:

=SUMPRODUCT($D$16:$D$23,Escalation)

I tried making the following changes to the indexation formula from this:

(1+INDEX($B$27:$B$29,MATCH(F16,$A$27:$A$29,0),1))^ ((B$1-E16)/365)

to this

(1+INDEX($B$27:$B$29,MATCH(F16:F23,$A$27:$A$29,0), 1))^((B$1-E16:E23)/365))

or as an array formula:

{=SUMPRODUCT($D$16:$D$23,(1+INDEX($B$27:$B$29,MATC H(F16:F23,$A$27:$A$29,0),1))^((B$1-E16:E23)/365))}

However this is not working. How do I do I incorporate an index formula
into this array formula?

Thanks

EM