Here is another type of calculator which probably only few people will regard as useful - a calculator for Matrix Operations. The Manual is included in the installation files. I used Gauss algorithm for the inversion of the matrix and for the liear set of equations solution. I used decimal.dll to reduce truncation errors. Enjoy ! Edit: updated to Minimat4.1 which works with Matrix library and FgGradientButton library. Edit: updated to 4.2 to suit Matrix1.2 library, and user manual added.