Have a read at JE McGimpsey's site for usage of double unary.

http://www.mcgimpsey.com/excel/formulae/doubleneg.html


Gord Dibben MS Excel MVP


On Wed, 23 Mar 2011 11:25:53 GMT, Vibhor Bansal wrote:

Hi Mike,

This formula help me also for sum of the products at alternate columns. I just wanna know the impact of '--' in a formula for better understanding...

Thnx,

Vibhor

On Thursday, September 25, 2008 5:29 AM JohnBlackwel wrote:

Folks,

I'm trying to find a formula for summing the contents of alternate cells in
a row?

I have a large workbook and want to calculate the contents of row 23 - i.e.
E23, G23, I23, K23, M23 etc etc, up to KK23. Is there a simple formula for
this?

John Blackwell


On Thursday, September 25, 2008 5:41 AM Mike wrote:

John,

=SUMPRODUCT(--(MOD(COLUMN(E23:KK23),2)=1),E23:KK23)

Mike

"John Blackwell" wrote:


On Thursday, September 25, 2008 5:44 AM Ashish Mathur wrote:

Hi,

Please array enter (Ctrl+Shift+Enter) the following formula

SUM(IF((MOD(COLUMN(E23:I23),2)<0),E23:I23))

What this formula does is that if the column number/2<0, then it sums up
the numbers from those columns.


--
Regards,

Ashsih Mathur
Microsoft Excel MVP
www.ashishmathur.com

"John Blackwell" wrote in message
...


On Thursday, September 25, 2008 6:06 AM JohnBlackwel wrote:

Fantastic Mike - thank you.

Sorry to be a pain, but how do I sum the other cells - i.e. D23, F23, H23,
J23, L23 etc etc, up to KK23?

John

"Mike H" wrote:


On Thursday, September 25, 2008 6:13 AM Mike wrote:

Hi,

Glad I could help for d23 etc use this
=SUMPRODUCT(--(MOD(COLUMN(D23:KK23),2)=0),D23:KK23)

Note all Ive done is change the range and altered the modulus to zero.
Columns D, F etc are even numbered so for D the formula days 2 mod 2 = 0

Mike

"John Blackwell" wrote:


On Thursday, September 25, 2008 10:31 AM HARSHAWARDHANSSHASTR wrote:

Mike,

What is the significance of -- in formula.

Harshawardhan Shastri

"Mike H" wrote:


On Thursday, September 25, 2008 12:59 PM David Biddulph wrote:

For an explanation of the double unary minus, see
http://www.mcgimpsey.com/excel/formulae/doubleneg.html
--
David Biddulph

"HARSHAWARDHAN. S .SHASTRI"


On Thursday, September 25, 2008 1:06 PM Lor wrote:

You could also try these two:

=SUM(NPV({0,-2},D23:K23))/2
=SUM(NPV({0,-2},,D23:K23))/2

"John Blackwell" wrote:


On Thursday, September 25, 2008 1:17 PM Peo Sjoblom wrote:

Clever. How do you find these Lori?

--


Regards,


Peo Sjoblom


On Thursday, September 25, 2008 3:49 PM Lor wrote:

Thanks Peo, i make them up :-) i figure there are many functions out there
which can be put to good use as long as you're aware of the limitations.

NPV is a good example - other useful values for rate a
1/-0.5: for a binary sum
9/-0.9 : for a decimal sum
Big/small: for the first or last value

eg: =NPV(1e20,A1:K1)*1e20

returns the first non-blank value in the row. Or...in Excel 2007 (cse):

=NPV(-0.9,,IFERROR(MID(A1,51-ROW(1:50),1)%,""))&""

extracts the numeric portion of a string such as
"apple 123 banana 345 pear 567 orange 678" - 123345567678



"Peo Sjoblom" wrote:


On Thursday, September 25, 2008 4:28 PM Peo Sjoblom wrote:

Thanks for the info Lori, very interesting.

I love the last one and I know how to get
numbers from a string as long as they are in one place.


--


Regards,


Peo Sjoblom


On Monday, July 26, 2010 2:52 AM Punnoose Mammen wrote:

Can someone please help me with a excel work sheet formula for sum total of even number cells if the odd number cells value is 1 or 0.

Example:1 if a1=1,a3=1,a5=0,a7=1,a9=0,a11=1, then a2+a4+a8+a12



Example:2 if a1=1,a3=1,a5=0,a7=1,a9=0,a11=1, then a6+a10