[newRPL] interested in RPN mode?

[Claudio L.]

(10-18-2019 10:17 PM)rprosperi Wrote:  As long as the stack is 'trimmed' to 4 levels after processing, it sounds interesting.

And by 'check after executing each command' does this mean each newRPL-native command, or would it include previously-defined newRPL prograns/commands already in the user's path? If the latter, then I suppose one could mix newRPL commands into newRPN commands and programs, so extended-stack manipulation components can be used (Matrices, Lists, etc.) as needed, returning simpler results to be consumed in the newRPN program.

Is that what you're thinking?

When I say each command, I mean each step in a program.
<< 1 2 3 4 5 >> would push a 1, then check, then push 2, check, 3, check, 4, check, then when pushing 5 there will be 5 elements on the stack, and the next check will trim the stack back to 4 elements. This allows all commands to work the same way in RPN or RPL mode.
User programs would always have the stack trimmed after each step, internal commands (which take a single step) have access to the infinite RPL stack internally,and they may return more than 4 elements in the stack, but there will be a stack check and trim happening.
So if a command returns more than 4 elements, you can simply switch to RPL or 8 level stack to get the full results.
In the background it's RPL commands doing the job, so you can work with large matrices, lists, etc.