Help me with matrices

[Zdravko]

Hi! I just wrote a C++ application for my course work, that calculates the determinant and the inverse of a 10x10 and a 20x20 matrix. Can you suggest me an internet application (or applet) that works with such sizes, so that I can check and compare my result?
http://www.bluebit.gr/matrix-calculator/ - this one allows only 12x12! :(

[jeremytaylor]

Can't think of an internet application but you could use octave... It's dead easy to use and is designed to do just such operations as matrix inversion.

Jeremy

[Zdravko]

I am using Windows now. I don't have this.
Can you help me? Then generate a matrix 20x20 of ints - use small numbers, 0, +/-1, +/-2.
Thank you in advance!

[WW]

You could use Scilab ( http://www.scilab.org/ ). They provide a Windows version.

In Scilab, you can do this:

-->A = floor(5*rand(5,5)-2)
A =

2. - 2. 2. 0. 1.
- 2. 1. - 1. - 1. 0.
1. 1. 0. 0. 2.
- 2. - 1. 1. 0. - 2.
2. 2. - 2. - 2. 0.

-->det(A)
ans =

30.

-->inv(A)
ans =

0. - 0.3333333 0. 0. 0.1666667
- 0.4 - 0.4666667 1. 0.8 0.2333333
0. - 0.3333333 1. 1. 0.1666667
- 0.4 - 0.4666667 0. - 0.2 - 0.2666667
0.2 0.4 0. - 0.4 - 0.2

-->

For 20x20, change rand(5,5) to rand(20,20).