Hi!
I will tell you concrete problem, which I have.

There, in the first sheet, I have a matrix with some numbers. In the second
sheet I have two columns with some values. I need that for the number from
matrix (from sheet 1) find the same number in the first column (from sheet 2)
and take value from the second column, same row (from sheet 2, too).
I tried to solve this problem, but no so successful!
Thanks in advance!