Another tentative candidate for the Excel Gurus Gone Wild: Do the Impossible with Microsoft Excel book: Convert a two-dimensional table/matrix into a column or row vector and vice versa :)
In spreadsheet modeling one often has to convert a two-dimensional table into a row or column vector and vice versa. This Excel file does just that by using the following formulas: =INDEX($C$17:$N$28;IF(MOD(P3;12)=0;12;MOD(P3;12));IF(P3/12=INT(P3/12);P3/12;INT(P3/12)+1)) and =INDEX($R$3:$R$146;MATCH($B31&"-"&C$30;$Q$3:$Q$146;0)).
The former formula is actually an involved version of =INDEX($C$17:$N$28;MOD(P3;12);INT(P3/12)+1) that fixes the last row problem.
This is, for instance, a problem that is tackled in Solver network optimization models, when a two dimensional cost/distance matrix is converted into a flow balance constraint form.