RPN Mode

[heldercorreia]

Originally reported on Google Code with ID 18

I know it's somewhat exotic - but i'm a fan of a rpn (reverse polish
notation) style user interface. Speed Crunch would (just from a GUI point
of view) suit this very well. 
Would it be thinkable to implement a RPN mode?

Reported by klemens.dickbauer on 2006-12-08 20:38:59

[heldercorreia]

Should be marked as enhancement.

Reported by klemens.dickbauer on 2006-12-08 21:26:50

[heldercorreia]

RPN would be great. Even without going to full RPN, some postfix notation would be
welcome. In Mathematica for example, where both infix and postfix notations can be
used,
sin(pi/3)
can be alternatively typed pi/3 // sin
The // symbol is used to signify a postfix application of the function. 
This will be useful specially when the "ans" variable has to be fed to a function.
One could then type "ans // f" or even simply "// f". 

Reported by B.Houchmandzadeh on 2007-02-23 09:59:28

[heldercorreia]

There is indeed plan to support RPN. I mark this as Enhancement.

Reported by ariya.hidayat on 2007-04-16 09:19:09

• Status changed: Accepted
• Labels added: Type-Enhancement
• Labels removed: Type-Defect

[heldercorreia]

Reported by helder.pereira.correia on 2007-06-12 09:51:27

• Labels added: Milestone-Release1.0

[heldercorreia]

Reported by helder.pereira.correia on 2007-12-16 21:45:51

• Status changed: New
• Labels removed: Milestone-Release1.0

[heldercorreia]

Calls to functions that take arbitraryly many parameters (like average) are difficult
to encode in RPN. Suggestions?

Reported by wolf.lammen on 2007-12-21 09:36:28

[heldercorreia]

Just use the stack. It's not a problem unless there is a limited stack size.

For example:

123
123
123
123
123
5
avg

The last stack entry is the number of values, and you then pass that number of
preceding stack entries to the function.

Most (actually all) calculators I know use statistical functions for this type of
stuff and that's generally totally separate from the normal notation used. It's
usually a table of values in memory that various calculations can be carried out
against. (Variance, standard deviation, mode, median, mean, correlation coefficients
etc).

I'd suggest the same approach.

Reported by MartinSGill on 2008-01-02 12:40:43

[heldercorreia]

Or you could use braces. Like
3 (12 4 + 8 2 3 * +) avg *
3 * avg ((12 + 4), (8 + (2 * 3)))
- mila

Reported by xchmelmilos on 2008-11-19 14:55:24

[heldercorreia]

Yes, please do it... :-)

Reported by sferrazzi on 2009-01-28 10:17:55

[heldercorreia]

As a long time HP 48GX user it would be superb to have such feature on Speedcrunch.
Any update regarding this matter?

Reported by aramon on 2010-05-24 08:12:28

[heldercorreia]

I look forward to see that implemented. I can't find any decent RPN calculator for windows.

Reported by brice.lenoir on 2011-05-23 12:53:13