Neall,
I am also having problems understanding why your formula does not work.
Breaking it down to its simples form, your formula is

Result = Price-(Price*Discount)

I tested and found the following:



If you have no data in Discount or Price, Result = Price

If you blank out a value in Discount or Price using the space bar, you get
#Value! error.

If you enter any other non-numeric value in Discount or Price, you get
#Value! error.

Provided you have NUMERIC values or a genuine blank cell in Price and
Discount, you will ALWAYS get an answer in Result.

To test data:

Somewhere else on your spreadsheet use the formula
=ISNUMBER(yourCellToTest)

If you get false, fix the relevant cell by selecting it and fixing a formula
or clearing the content.

Hmmmmmm, try this first:

1) In a blank cell, type 1
2) Copy that cell
3) Highlight all price and discount values in your sheet (not formula)
4) Paste Special
5) Choose 'Operation' 'Multiply'
6) Click 'OK'

--
Steve

"Art" wrote in message
...
Neall,
The equation as shown in your 5/29/09 2:40PM posting has errors and can't
be entered as shown.

I tested the equation that I posted and would appear to cover all of your
conditions. I assigned the name "Disc" to a cell formatted as percentage.
M36 and Q36 tested as either General or Currency formats with same
results.

formula in Q36: =IF(ISNUMBER(M36),M36-(M36*Disc),"")

Tested on Excel Office X, and 2004

Some examples:

M36: Disc: Result in Q36
100 0% 100
100 5% 95
blank 0% blank
100 blank blank
blank blank blank

Is this what you intended ?

Art

On 5/29/09 2:40 PM, Neall wrote:

Thanks but that doesn't work, here is the syntax I thought would work, I
use it on my other formula's to get rid of "#Value" in my cells when
the cell should be blank

=IF(ISERR((M29-(M29*Disc),M29-(M29*Disc),M29)),"",(M29-(M29*Disc),M29-(M29*Disc),M29))

Again basically if there is no discount to be given the cell should just
be populated with what is in M29, if there is a discount to be given
(Disc would have a percentage) then is will do the math to show the
discounted amount in the cell. Again this all works great but when there
is no part number to price against or give a discount against I get the
#Value error in the field because the answer is 0, which messes up price
sum value.

Any suggestions how I can get this to work so the cell is empty when
there is no pricing involved?

Thanks




"Art" wrote:
On 5/29/09 8:57 AM, Neall wrote:

I guess I should explain, I have a set of cells that show full
price M29 -
M36 then I have another set of cells that show price either A)
as full price
(pulling from M29 - M36) or the discounted price Q29 - Q36.

So basically if there is no discount the full price of the parts
get shown
in Q29 - Q36 if there are discounts to be had then Q29-36 show
the discounted
amount for each part

So in Q29 - Q36 I have this

=IF(M36-(M36*Disc),M36-(M36*Disc),M36)

Which is saying if there is no discount then take the numbers
from M and
display them in Q, if there is a discounted noted show the
discounted price
and not the values in M

This works now I just need to get ride of the #Value! in those
cells when
there is no part to price against, because its effecting the sum

Thanks in advance



Neall,
The first argument (logical_test) in an IF statement needs to evaluate
to a boolean result. In your formula above, the evaluation of
"M36-(M36*Disc)" is likely numeric which will lead to unpredictable
results.

You might try something even simpler like this:

=IF(ISNUMBER(M36),M36-(M36*Disc),"")


--
Regards,
Art