Efficient Array Formula Construction
 

Is there a better array formula construction than the one described below?

I have two columns. Column A contains department designations (i.e. dept A,
dept B, dept C, dept D, etc). Column B contains dollar amounts.

The formula parameters are to sum multiple designated departments into one
cell.

I have the following formula developed:

{=sum((a1:a100=dept a)*(b1:b100))+sum((A1:a100=dept c)*(b1:b100))}

Instead of having two sum statements, can the formula be condensed to one
sum statement? For example,

{=sum((a1:a100=And(dept a, dept c))*(b1:b100))}

I have tried the above formula, but could not get it to work.

Second question - is it possible to set up the array formula to deal with
conditions that change? For example, department A and department C belong
to the Midwest region. However, next year department C belongs to the
Southwest region and department B belongs to the Midwest region.

I don't want to have to change hundreds of array formulas due to
department changes.

I have thought about using named ranges that designate a list of departments
belonging to regions. However, I have been unsuccessful in this approach.

Efficient Array Formula Construction
 

If you create a named range of Midwest departments - midwest - then try

=sumproduct(--isnumber(match(a1:a100,midwest,0)),b1:b100)

which only requires ENTER


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Efficient Array Formula Construction
 

See if this helps.



=SUMPRODUCT((A1:A100={"dept a","dept c"})*(B1:B100))



I use to work with a guy name Mike Moore. Did you ever worked at El
Monte California?


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Efficient Array Formula Construction
 

....and to answer your first question, you can use the same formula
without a named range, if you wish, by specifying an array of
department names with the formula i.e.

=sumproduct(--isnumber(match(a1:a100,{"dept A","dept B"},0)),b1:b100)


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Efficient Array Formula Construction
 

To answer your question:

Instead of having two sum statements, can the formula be condensed to one
sum statement? For example,

{=sum((a1:a100=And(dept a, dept c))*(b1:b100))}

I have tried the above formula, but could not get it to work

You were nearly there, try the array entered formua:

{=SUM((A1:A100={"Dept a","Dept c"})*(B1:B100))}

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HTH

Sandy
In Perth, the ancient capital of Scotland


with @tiscali.co.uk


"Mike Moore" wrote in message
...
Is there a better array formula construction than the one described below?

I have two columns. Column A contains department designations (i.e. dept
A, dept B, dept C, dept D, etc). Column B contains dollar amounts.

The formula parameters are to sum multiple designated departments into one
cell.

I have the following formula developed:

{=sum((a1:a100=dept a)*(b1:b100))+sum((A1:a100=dept c)*(b1:b100))}

Instead of having two sum statements, can the formula be condensed to one
sum statement? For example,

{=sum((a1:a100=And(dept a, dept c))*(b1:b100))}

I have tried the above formula, but could not get it to work.

Second question - is it possible to set up the array formula to deal with
conditions that change? For example, department A and department C belong
to the Midwest region. However, next year department C belongs to the
Southwest region and department B belongs to the Midwest region.

I don't want to have to change hundreds of array formulas due to
department changes.

I have thought about using named ranges that designate a list of
departments belonging to regions. However, I have been unsuccessful in
this approach.

Efficient Array Formula Construction
 

Sorry, don't want to confuse you with multiple suggestions :( but....

This formula, which only requires ENTER is, another way to go

=SUM(SUMIF(A1:A100,{"dept a","dept b"},B1:B100))

array entered, i.e. using CTRL+SHIFT+ENTER, you can also use the above
with a named range

=SUM(SUMIF(A1:A100,midwest,B1:B100))


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Efficient Array Formula Construction
 

I understand the solution of . . . .

=sumproduct(--isnumber(match(a1:100,midwest,0)),b1:b100)

Now, I am going to throw one more issue into the problem.

What if I have a third column containing text (such as "revenues" and
"expense").

I need to add all the revenues for all the midwest departments into one
cell. Or, I need to add all the expenses for all the midwest departments
into one cell.




"Mike Moore" wrote in message
...
Is there a better array formula construction than the one described below?

I have two columns. Column A contains department designations (i.e. dept
A, dept B, dept C, dept D, etc). Column B contains dollar amounts.

The formula parameters are to sum multiple designated departments into one
cell.

I have the following formula developed:

{=sum((a1:a100=dept a)*(b1:b100))+sum((A1:a100=dept c)*(b1:b100))}

Instead of having two sum statements, can the formula be condensed to one
sum statement? For example,

{=sum((a1:a100=And(dept a, dept c))*(b1:b100))}

I have tried the above formula, but could not get it to work.

Second question - is it possible to set up the array formula to deal with
conditions that change? For example, department A and department C belong
to the Midwest region. However, next year department C belongs to the
Southwest region and department B belongs to the Midwest region.

I don't want to have to change hundreds of array formulas due to
department changes.

I have thought about using named ranges that designate a list of
departments belonging to regions. However, I have been unsuccessful in
this approach.

Efficient Array Formula Construction
 

Just expand the previous answers
eg if revenue appears in column C
=SUMPRODUCT((A1:A100={"dept a","dept c"})*(B1:B100))

becomes
=SUMPRODUCT((A1:A100={"dept a","dept
c"})*(B1:B100)*(c1:c100="Revenue"))

Regards

Dav


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Efficient Array Formula Construction
 

...or with your named range

=sumproduct(--isnumber(match(a1:100,midwest,0)),b1:b100,--(c1:c100="revenue"))


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