Math can be fun.
Beta-Testing Closed
A big "thank you", to everybody who participated in beta-testing the next version. The testing phase is now closed.
The two testers who have provided the most valuable feedback will share an award in form of AooStore/Amazon/similar gift vouchers of their choice. Congratulations, and thank you!
Watch this space for release news about the next version!
Stockholm, 2018-11-11.
High Precision Arithmetics
Supports numbers with up to 38 significant digits.
Multiple Data Types
Real numbers, binary numbers, lists, arrays or vectors, names, and strings.
Interactive Stack Display
The display expands to see up to 16 levels at a time. You can easily scroll through and select your entries.
RPN 28x Calc
RPN 28x Calc is a scientific calculator with a dynamic stack display. It uses reverse-polish notation (RPN) for its operation.
As you add more values to the stack, the display automatically expands. To see more lines, simply swipe to scroll. You can also re-order the levels or modify any of the values on the stack.
New Variable Viewer
You can browse all variables in a separate viewer. To make a variable available to a command, simply select it in the viewer and issue the command. Double-tap a variable to edit it.
Command & Results History
Select "Log" to display your command history. To place a value back onto the stack, double-tap it. Swipe upwards to reveal a panel of action buttons, i.e. to delete entries or to share the log.
Command Panels
The side panel has a keyboard and three pages of commands. You can swipe across the panel to navigate between the pages.
Work With Operands
Tap an operand in display to select it. Then issue a command on the selected operand.
User Guide
From the info menu within the app, you can download the user guide with an introduction and a command reference.
Multiple Undos
You can restore previous stacks with the UNDO command. Using LAST you can get back the most recently used operands.
Landscape Orientation
When you rotate the iPad, RPN 28x Calc re-adjusts its layout to fit the available screen area.
No Ads
No interruptions. RPN 28x Calc does not display ads. There are no rating requests.
RPN 28x Calc
iPad $2.99
Version 2.2.1 (603)
8 January 2016
Languages: English
iOS 8.4 or later.
Tested on iOS 8.3.
Beta-testing of the next version is now closed.
Version 2.1 adds action buttons to the command log. New command: ≠ and aliases: CHS, SQRT, and ==.
Version 2.0 adds a log and variable viewer.
Plans for future versions
(NOT YET SUPPORTED):
- User-definable buttons.
- Support for programs.
- Complex numbers.
- Matrices, i.e. arrays within arrays.
- Arithmetic expressions.
Also Note
- June 28 is Tau Day, celebrating the circle constant τ = 6.283185… (2π).
- Pi Approximation Day is observed on July 22.