Hi
there are a number of formulas called "array formulas" and in some cases,
"normal" formulas whoes functionality is extended when entered as an array
formula.
To enter an array formula you need to use ctrl & shift & enter instead of
just enter. When you look in the formula bar after entering an array
formula you will see { } around the formula - these indicate that it has
been array-entered.
An array formula basically works on a number of cells rather than just one
cell.
In the formula you were given
=MIN(IF(C2:C12>0,C2:C12))
you need to test if more than one cell (e.g. C2:C12 is greater than 0),
normally you can only ask this question of one cell (ie IF(C2>0 ... )
however, if you array enter it the question is asked individually on each
cell within the range.
Hope this explaination doesn't make you more confused then when you started
Cheers
JulieD