You can use

=IF($C$2=A18,A18,NA())

the chart will work as if the cell was empty, if you think the #N/A is ugly
use conditional formatting and a white font to make it
less visible

formatconditional formatting, formula is

=ISNA(Cell_that_holds_the_formula)

format button, font and white font, click OK twice



--
Regards,

Peo Sjoblom

(No private emails please, for everyone's
benefit keep the discussion in the newsgroup/forum)



"mpierre" wrote in message
...
Is there any way to make a cell value = to null?
I'm using the following: =IF($C$2=A18,A18,"") to make cell B18 = to A18
if
A18 is =C2. My problem is that when this is not true, I want the cell to
be
blank. I mean I want it to be as if I never had any value in it at all.
I
want it to be empty. As it is with what I'm doing, the "blankness" is just
a
space or something because when I try and plot the data range, the chart
recognizes that the cell has a value and plots a zero or a gap.

Is there anyway to make the chart see the cell B18 as if there is nothing
in
there what so ever, unless the equation above is true?