I've got a large system of quadratic equations that I need to solve (~60 variables). I'm not sure how to do it.
All the equations are in a .txt file where each line is an equation that equals zero. Ie.

a*b+3*c+d
x*y+y*y+1
.
.
.

If I could do it in matlab without having to input the equations, that would be great, but i'm willing make a matrix or whatnot if need be. Any help would be great. Thanks!

2/18/2007 10:52:00 PM

Somebody teach this boy some linear algebra!

2/19/2007 11:24:29 PM

^

Quote :

"a large system of quadratic equations "

you can do this in matlab without much effort. Just pretty much copy and paste, though you'll have to add some semicolons. You only have 60 eq'ns so it can't take that long.

In matlab you'll use "fsolve". Just check out the help file for that function.

[Edited on February 19, 2007 at 11:44 PM. Reason : .]

2/19/2007 11:40:19 PM

If you get bored and try it with Solver in Excel, let me know if it actually works ... Solver crashes way too often

[Edited on February 19, 2007 at 11:49 PM. Reason : .]

2/19/2007 11:49:18 PM

matlab is way more robust, I wouldn't even waste your time attempting it in excel.

2/20/2007 12:00:29 AM

matlab can do the most amazing things

i'm out at the computational science and engineering conference this week, and the guys here 0wn matlab on a daily basis. it's incredible.

2/20/2007 4:28:50 PM

thanks.

also clalias, thank's for pointing out they were quadratic.

2/20/2007 7:35:29 PM

There's a system to the system.

2/20/2007 7:44:26 PM