Need help with stack multiplication

E

exceluser1609

New Member
Joined
Nov 2, 2017
Messages
3
I have following data that varies by time:

The table below shows the base cashflows at each time

t
1
2
3
4
5
6
7
8
9
10
11
12
Cashflows
CF1
CF2
CF3
CF4
CF4
CF5
CF7
CF8
CF9
CF10
CF11
CF12

<tbody>
</tbody>

The table below shows the scaling factor that varies by time and are used to scale up the cashflows:

t
1
2
3
4
5
6
Scaling factor
SF1
SF2
SF3
SF4
SF4
SF5

<tbody>
</tbody>

Looking for a formula to do stack multiplication at each time, with the following required output

t
Output
1
SF1*CF1
2
SF1*CF2 + SF2*CF1
3
SF1*CF3 + SF2*CF2 + SF3*CF1
4
SF1*CF4 + SF2*CF3 + SF3*CF2 + SF4*CF1
5
SF1*CF5 + SF2*CF4 + SF3*CF3 + SF4*CF2 + SF5*CF1
6
SF1*CF6 + SF2*CF5 + SF3*CF4 + SF4*CF3 + SF5*CF2 + SF6*CF1
and so on
SF1*CFn + SF2*CF(n-1) +………………………………..+ SFn*CF1

<tbody>
</tbody>

Please let me know if there is any formula to do this quickly and if further details are required.

Thank you
 

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Welcome to the board.

Maybe:

Excel 2012
ABCDEFGHIJKLM
t
Cashflows
t
Scaling Factor
tOutput

<colgroup><col style="width: 25pxpx"><col><col><col><col><col><col><col><col><col><col><col><col><col></colgroup><thead>
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[TD="align: center"]15[/TD]
[TD="align: right"]6[/TD]
[TD="align: right"]24.5[/TD]
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</tbody>
Sheet2​

[TABLE="width: 85%"]
<tbody>[TR]
[TD]Worksheet Formulas[TABLE="width: 100%"]
<thead>[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]
[TH="width: 10px"]Cell[/TH]
[TH="align: left"]Formula[/TH]
[/TR]
</thead><tbody>[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]B10[/TH]
[TD="align: left"]=SUMPRODUCT(SUBTOTAL(9,OFFSET($B$7,0,ROW(INDIRECT("1:"&A10))-1))*SUBTOTAL(9,OFFSET($B$3,0,A10-ROW(INDIRECT("1:"&A10)))))[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
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</tbody>[/TABLE]
 
Upvote 0
Eric W said:
Welcome to the board.

Maybe:

Excel 2012
ABCDEFGHIJKLM
t
Cashflows
t
Scaling Factor
tOutput

<tbody>
[TD="align: center"]1[/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
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[TD="align: center"]2[/TD]

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[TD="align: center"]15[/TD]
[TD="align: right"]6[/TD]
[TD="align: right"]24.5[/TD]
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</tbody>
Sheet2​

[TABLE="width: 85%"]
<tbody>[TR]
[TD]Worksheet Formulas[TABLE="width: 100%"]
<tbody>[TR]
[TH]Cell[/TH]
[TH="align: left"]Formula[/TH]
[/TR]
[TR]
[TH]B10[/TH]
[TD="align: left"]=SUMPRODUCT(SUBTOTAL(9,OFFSET($B$7,0,ROW(INDIRECT("1:"&A10))-1))*SUBTOTAL(9,OFFSET($B$3,0,A10-ROW(INDIRECT("1:"&A10)))))[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[/TR]
</tbody>[/TABLE]
Click to expand...

thank you so much.. very helpful
 
Upvote 0
Eric W said:
=SUMPRODUCT(SUBTOTAL(9,OFFSET($B$7,0,ROW(INDIRECT("1:"&A10))-1))*SUBTOTAL(9,OFFSET($B$3,0,A10-ROW(INDIRECT("1:"&A10)))))
Click to expand...

... which given your helper column could be simplified to:

=SUMPRODUCT(SUBTOTAL(9,OFFSET($B$7,0,A$10:A10-1))*SUBTOTAL(9,OFFSET($B$3,0,A10-A$10:A10)))

or even more succinctly:

=SUMPRODUCT(N(OFFSET(B$7,,A$10:A10-1)),N(OFFSET(B$3,,A10-A$10:A10)))
 
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