I am grateful to one and all who helped me with this challenge. It ended up
being an extremely interesting theoretical question, which relates to a
fundamental paradox in the way Excel funcions. I ultimately found the
solution by googling the following search:
must contain word "Excel"
must contain phrase "return blank"
this got me the following website, created by Allen Wyatt which offered a
perfect solution:
http://exceltips.vitalnews.com/Pages/T0809_Returning_a_Blank_Value.html
Thanks again to all !!! -GZ-
Returning a Blank Value
Summary: Some people want a formula to return a blank value based upon a
calculation or comparison. Such a condition is impossible in Excel—formulas
can never return blank values. (In fact "blank value" could be considered an
oxymoron, as any value is, by definition, non-blank.) This tip explains the
details of such statements. (This tip works with Microsoft Excel 97, Excel
2000, Excel 2002, and Excel 2003.)
The purpose of formulas is to return a value based upon a calculation or
comparison. For instance, if you use the formula =1+1, the sum is calculated
and the value 2 is returned. There might be times, however, when you want to
use a formula and actually return nothing. For instance, you might want to
compare a value in a cell to some constant, and return a numeric value if
they are equal, or return nothing if they are different.
The problem is that a formula must, under all circumstances, return
something--for it not to do so would go against the very purpose of formulas.
There are two ways to approach the problem, and how you do so will affect
what you can and cannot do with your results. Consider the following formula:
=IF(A1=0,"",1)
In this instance, the cell containing this
• will contain a blank value ("") if A1 is 0
• contain a numeric value (1) if it is 0.
In either case, something is being returned. You could, however, use the
following variation on the formula:
=IF(A1=0,,1)
The only difference here, of course, is that the quote marks have been
removed. Interestingly enough, in this case Excel assumes there is a zero
between the two consecutive commas, and if A1 is 0, the formula returns a 0.
Again, formulas must return something.
The way that Excel's other functions interpret the results of these two
formulas is also very interesting. It is instructive to look at how the
COUNT, COUNTA, and COUNTBLANK functions interpret the results.
COUNT is used to count the number of cells in a range that contain numeric
values. If the cells contain text, or if they are empty, they are ignored. In
the case of our formulas, if you use the first formula, COUNT counts the cell
if A1 is not zero. If you use the second formula, COUNT will always count the
result, since it always returns either 0 or 1, which are both numeric.
COUNTA is used to count the number of cells in a range that contain
anything. Regardless of which formula you use, COUNTA will count the cell
since formulas always return something. (It can also be argued that COUNTA
counts the cell because it contains a formula, but that is probably a fine
semantic difference.)
COUNTBLANK examines cells and counts them only if they are blank. In the
case of the first formula, COUNTBLANK will count the cell only if A1 is 0. In
the case of the second formula, COUNTBLANK will never count the cell, since
the formula always returns a 0 or 1 and is therefore never blank.
The above discussion applies if the COUNT, COUNTA, or COUNTBLANK functions
are evaluating the results of a series of cells that actually contain
formulas. However, if the range includes cells that are really blank (i.e.,
they contain nothing, not even a formula), then that can affect what is
returned by the functions. Blank cells don't affect the results returned by
either COUNT or COUNTA, but they do affect the results returned by COUNTBLANK.
What does all this mean? It means that a cell that contains a formula is
never really, truly blank--only cells with nothing in them are blank. How the
result of the formula is interpreted, however, depends on the Excel functions
being used to perform the interpretation. Since different functions interpret
formula results differently, you need to be concerned with what you really
want to find out about the formula results, and then use the function that
will help you best determine that information. If you don't get the result
you expect with a particular function, search around--chances are good that
Excel has a different function you can use to get the desired results.
That being said,
if you have a range of cells that all contain formulas similar to
=IF(A1=0,"",1), and
you want to delete the formulas in the cells that return a blank value (""),
you can quickly do so by following these steps:
Range / F5 / special / Formulas / text (only box checked) / ok
Excel selects all cells where the formula returned a text value.
all the formulas that returned “â€
Delete.