This is the best calculator program ever written. It literally can be all things to all people. It's essentially a single column spreadsheet with quick access to advanced scientific functions. If you like RPN it does that, but I find parenthesis are more readable for complicated sequential formulas. Add to all that the graphing ability, the matrix algebra, and statistics functions, and custom functions and programmability, and I don't think there is any other calculator that comes even close. I only wish someone would rewrite it as a phone app.
