Originally Posted by

**CaptainBlack** Excel (or Gnumeric, or LibreOffice - the new name for OpenOffice), put the x's down the first column and the y's across the first row. Enter f(x,y) in any cell making the row for the y absolute and the column for the x absolute. Copy the formula to all the cells.

However if you really mean what it says in the subject line, that you want to solve an equation of the form f(x,y)=C subject to constraints on x and y you should look at the solver in Excel (I would not recommend the solvers in the other two, as they are not quite as general and complete as that in Excel).

CB

I just did some playing around with Excel 2007 and it is suprisingly easy to do this! I did exactly what you suggested and it works like a charm. I still need to do some tweaking to get the formula to apply correctly on all of the cells but I'm certain this is the right track to my solution. Unfortunately I don't have Excel at home so I'll have to download something else. Thanks for the suggestion.