I'm having difficulty writing the correct formula to find the value of a cell at the intersection of dynamically chose row and column. The choices for row and column are populated by data validation.
A very simple version using a colour mixing example can be found here: https://docs.google.com/spreadsheet/ccc?key=0AsOxG6LF9b4XdEliSlMzQl94UnJWOF9IZVducHRNS1E&usp=sharing
Which uses the following formula:
=INDEX(A1:D4; MATCH(B9,A2:A4,0); MATCH(C9,B1:D1,0))
What am I doing wrong here? Is this the best method for finding data in a simple table using multiple criteria?