casio fx-5500l
## matricesmatrix support is semi-lame, but of some use. you can have ## numerical integrationas usual, casio have implemented simpsons rule with no improvements. the unit
can choose ## complex numbersthese were implemented a bit better than i'd expected. several calculators boldly claim to support complex numbers when, in fact, all you can do is basic arithmetic in a very cack-handed way (eg sharp el-545h, hp-20s). you get to type in generic expressions involving `i' combined with one of the problems inherent in complex numbers is that you need internally
twice the precision for operations as simple as multiplication. for example ## equation featuresas well as the ability to store, recall and evaluate formulae (but not solve), there is a special equation mode hardcoded for two other features; solving quadratics and simultaneous linear equations. the quadratic solver is a simple implementation of the textbook formula with no refinements, although nicely, complex roots are also returned. results were poorer than the el-9900 (see the quadratics article). the simultaneous equations solver is the same as the matrix support, but
saves the effort of entering the coefficient matrix, inverting it and
multiplying by the values by doing it all from your |