Hi!

This formula works as a worksheet formula. Whether it
works as a source for a chart, I don't know but you can
give it a try:

=IF(COUNTA(A:A)21,OFFSET(A1,COUNTA(A:A)-1,0,-21,1),OFFSET
(A1,0,0,COUNTA(A:A),1))

As a worksheet formula this would be entered as an array.
Don't do too much (hardly any) charting but I do a lot of
formula creation.

Biff

-----Original Message-----
Guys,
I have a spreadsheet with timestamps on col A, then
Col B contains the
values correspond to timestamps in ColA (Col C thru Col M
are similar to Col
B as well). I am trying to build a chart in function of
time (meaning
Values for the X axis would be B2..M2, and Y axis would
be B3..M3 for the 1
series, then B3..M3 for the values in x-axis, and B4..M4
for Y axis, so
on...).
Number of rows is subject to change (time stamps), and
I am only
interested for the last 21 entries (if there is less than
21 entries, plot
them all, otherwise, only plot the last 21 entries).
Can someone please help me with the equation (offset?)
in name definition?

Thanks
.