Hi Biff,

Thanks for your reply. I have used the COLUMNS function in the past and you
are correct that it does indeed work in this situation. I had not used the
MATCH in this situation before and it is a good idea.

I guess my main concern is to understand why the initial formula I wrote
below doesn't work when I add a new column. Do you think that it's a glitch
of some sort with Excel? When I add a new column, I would expect the VLOOKUP
to change because after I add the column, the 5th column in my array has
become the 6th column, but as I descibed, the VLOOKUP continues to show the
same result as it had previously until you go into the formula and then hit
Enter.

Thanks again,

Ian



"Biff" wrote:

Hi!

Are you always using the last column of the table as the
column_index_number? If so:

=VLOOKUP(B564,$B$1:$F$558,COLUMNS($B1:$F558),0)

Do your columns have headers? Use a MATCH function to find the correct
column_index_number:

=VLOOKUP(B564,$B$1:$F$558,MATCH("column_header",$B $1:$F$1,0),0)

Biff

"Ian" wrote in message
...
I have been using VLOOKUP functions extensively for a long time and
recently
encountered a problem that I haven't seen before.

My VLOOKUP formula is: =VLOOKUP(B564,$B$1:$F$558,5,FALSE)

When I insert a new blank column in the middle of the array, the VLOOKUP
function continues to return the same value as it did before I inserted
the
column. After inserting the column, the old value is now in the 6th
column,
but the VLOOKUP output doesn't change.

The calculation option in the Tools-Options menu is set to "Automatic" and
pressing the F9 key doesn't change the output. The only way I am able to
get
the VLOOKUP to change is by going into the VLOOKUP function and then
pressing
enter.

A person I know recently told me that he also has this problem with the
VLOOKUP. Has anyone encountered this problem before? Any suggestions
would
be appreciated.