I’m pleased with this applet because I’ve been thinking of doing this one for years. To get what I’ve wanted I’ve had to do some hard thinking about the programming, and I now have some techniques I can reuse time and time again.
Why a calculator? The applet can be used to enter any reasonably-sized matrix and calculate its inverse if it exists, so you could call it a calculator. I expect some people will use it as such. But it’s real purpose, as is usual with Waldomaths applets, is to demonstrate the method of calculation and give insights into the mathematical behaviour of matrices.
Already I’ve played around with it myself for hours. It’s great not having to do endless repetitive calculation myself to see results.
I’m already planning an applet of finding inverses using row reduction.