Is There A Free Web Tool For Solving F(x,y) Equations?

So I'm embarassed to say I have a degree in computer science and engineering and I'm tweaking with some formulas I'd like to use in a game I'm building, and my math is very rusty--much worse than I thought. I'm trying to find a free tool or website that would present the results of an f(x,y) function in tabular format so I could just eyeball the results of the equation as I make adjustments to the values for x and y... if that makes sense?

For example, I'd like to see all of the results for the following equation:

f(x,y) = (x - y) / (x + y)

where:

x and y are integers

x >= y

y > 0

x < 100 (or some other value that i could plug in myself)

I've found some tools that can kind of show it in 3D format but I can't seem to find one shows results like this:

x y z

2 1 .3333

2 2 0

3 1 .5

3 2 .2

3 3 0

4 1 .6

etc.

Any help would be greatly appreciated! I'm banging my head against the wall...

Thanks,

Embarrassed and Forgetful Math Noobie

Excel will work just fine

Quote:

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.