RPN 28x Calc FAQ

Frequently asked questions.

1 General Questions

1.1 Which version do I have?

The version number is shown in the bottom right corner of the display. You may need to squint a little to see it. If you were unable to see it, you can select "Email Your Feedback" from the action menu in the top right corner. The version number is mentioned in the text of the email.

1.2 Can I use an external keyboard?

Yes. Support for an external keyboard was added in Version 1.3.

1.3 Why does "30 SIN" produce "-0.988…"?

You are operating in radiants mode (RAD); the "2-pi" symbol is shown at the top of the display. To change to degrees mode, execute the DEG command; the "2-pi" symbol will disappear. Now "30 SIN" produces "0.5".

2 User Interface

2.1 How do I clear the command log?

The log is limited to 512 entries, above which the oldest entries will be removed.

Beginning with version 2.1, you can clear the log manually. Swipe upwards in the log viewer to reveal a panel with action buttons.

Using the selector on the left, you can limit your actions to:

  • All Entries,
  • Today,
  • Recent (i.e. a day earlier than Today), and
  • Not Today.

To delete the entire log, select "All Entries" and press the trash can icon.

To email today's entries, select "Today", press the share button and select Mail in the action sheet that will appear.

2.2 What is meant by "Recent" in the command log selector

Basically, it selects entries that were added "on a day before today". If you were using the app every day, that would be the same as "yesterday". If you were using RPN 28x Calc only on Sundays, then for you, "recent" would mean "last Sunday".

3 Known Issues

3.1 Matrices (arrays of arrays) not supported

Currently, arrays of arrays are not supported. Certainly, this is on the list of future updates.

You may see a side effect of this when you add an array to the statistics array with the '&Sigma:+' command. What happens then is that the array is unpacked and its elements are added to the statistics array (which is purely one-dimensional).

3.2 Very large numbers in FIX mode

Update: This has been fixed version 1.1.

When the FIX number formatting mode is enabled, then very large numbers may be too large to fit the screen and they will appear scaled and truncated. The corresponding number is intact, it is merely displayed badly.

4 Contacting tredje design

4.1 How can I become a beta tester?

Simple, please contact me.

4.2 When will RPN 28x Calc become available in my language?

Since all calculator commands use English names or abbreviations, it is not meaningful to create different versions for other languages. There are therefore no plans to create non-English versions of this application. Sorry.

4.3 I think I found a bug. What should I do?

Within the app, you can select "Email Your Feedback" from the (i)nfo menu. If you like, you can save the message as a draft (tap Cancel, then Save Draft) and continue editing it from within your email program.

Feel free to write your message in English, German, or Swedish.

Alternatively, you can send an email to tredje.bugreport@mailnull.com (don't put this address in your address book as it is temporary), or use the online contact form.

The following information would be helpful:

  • Which version of RPN 28x Calc are you using?
  • Which iPad do you use?
  • Which version of iOS is installed?
  • If it crashed, what was it that you were trying to do when it happened?
    (Please sync your iPad with iTunes and include the crash log: ~/Library/Logs/CrashReporter/MobileDevice/*/Calculator-*.crash).

4.4 My question is still unanswered. What can I do now?

Why don't you post your question on this contact form?