Recall Arithmetic: The haves and have-nots

[Dave Britten]

(06-19-2015 06:09 PM)Dwight Sturrock Wrote:  I never noticed the 34C or 15C recall arithmetic until I started using the 42S and started writing really long or complex programs. I was surprised a few years back when I discovered the 15C has it.

It really is the icing on the cake for RPN. And it's hard to do without it once you begin to use it. What's strange is the 15C has it, 41C doesn't, and the 42S does.

The 15C came after the 41C, and had a few features the 41 didn't. Matrices, solver, integration, etc. The Advantage module adds a lot of 15C features (and some from the 16C and 12C), but recall arithmetic isn't one of them.

Fortunately, you can emulate it easily enough. RCL- n becomes X<> n, STO- n, X<> n. I think that would work with indirect addressing, too; don't have my 41 with me at the moment to test. (Which models do indirect recall arithmetic? Probably the 42S at least, I would imagine, and the 32S family via (i).)