At 22:57 22/01/2013 +0100, Kolbjørn Stuestøl wrote:
Is there any way to find the first occurrence of
a number less (or greater) than a given number
in an unsorted array or a column?
Example: A1:A31 contains a list of temperatures
a given month. I would like to find the first
day the temperature is below 0 degrees (metric).
What happens if there is no day in the month when
the temperature was negative? Let's say you want
the value zero for the resulting day number in this case.
This is a little messy, but it works:
o In B1, enter =A1<0 and fill it down the column
to B31. This generates TRUE for your negative values and FALSE otherwise.
o In your result cell, enter
=N(MATCH(TRUE;B1:B31;0)) . The MATCH() function
searches for the first TRUE value in the column B
values and returns the relative position in the
array of the first match. (Note that this is not
necessarily the row number, though will be in
your example.) This would return the #N/A error
if there is no negative temperature; the N()
function makes no change to real dates but converts this error to zero.
You may choose to hide column B, of course - or
you could put its values away somewhere else on
the sheet or even on a different sheet.
Incidentally, you are unlikely to get
temperatures "below 0 degrees (metric)", as the
SI temperature scale is kelvin, and its zero is
the absolute zero of temperature! But yes: I
appreciate that you mean the celsius scale. ;^)
I trust this helps.
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