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The Dashboarder

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Download

RPN Calc.zip

Version 1.1
May 14, 2005
File size: 56 kB

If you're using Safari:

Click the link to the left. Safari should download and automatically install the widget in ~/Library/Widgets for you. Launch Dashboard and you're all set.

Other browsers:

Click the link to the left. Depending on your browser's settings, you may need to manually install the widget in ~/Library/Widgets for personal use or /Library/Widgets for anyone on the computer to use. (That second option requires administrative access.)

Features

RPN Entry Once you get used to it, you'll never want to go back to algebraic notation. That's why Procyon IT has developed the first RPN calculator widget. If you've used RPN before, you'll feel right at home. New to RPN? No problem! Check out our guide to RPN entry for a primer; you'll be up to speed in no time.
Base Conversion Quickly switch between decimal, hexadecimal, octal, and binary representations. Need to work in another base? No problem! Just enter the base you want on the stack, and then click base (inv+bin). If you really want, you can even work in bases greater than 36. (Have fun.)
Decimal-to-fraction Conversion With a click of a button (→^x/_y) convert the top number on the stack to a fraction! (Click again to convert it back to a decimal, if you really want to for some reason.) Work in decimals or in fractions -- it's up to you!
Bitwise Arithmetic And, nand, or, nor, xor and xnor are built-in for your bit-juggling pleasure. RPN Calculator uses a 32-bit word size, a limitation of JavaScript.
Hidden Keypad Never use the mouse on a calculator? Neither do we, so we took it out. Use the keypad to enter numbers and the four basic functions. Most other functions have key equivalents, too (see Keyboard Shortcuts, below).
Clipboard Support Widgets are great, but when was the last time you played with a calculator for the fun of it? Fun as they are, calculators are a tool to get "real" work done. RPN Calculator supports copying, cutting, and pasting numbers to and from the clipboard so you can quickly get your data where you need it.

Screenshot

Tips and Tricks

There's no "Clear All" button. You can use Cmd-R to reload the widget; that should clear it.
Calculations performed with a fraction will yield a fraction for an answer.
The keyboard shortcuts for Copy, Paste, and Cut work on the top element of the stack.

Key Equivalents

Key	Description
space return	Put the number you're typing on the stack
[ ]	Rotate left and rotate right
pg up pg dn	Roll the stack up or down
~	Swap the top two numbers on the stack
+ - * /	Add, subtract, multiply and divide
& \| ^	Bitwise and, or, and xor
!	One's compliment
@	Two's compliment (same as neg)
_	Negative
\	Convert to and from a fraction

Version History

Version	Date	Release Notes
1.2	May 24, 2005	Customizable buttons. You can now assign any function to any button. That leads us to... Programmability. Make up your own buttons! Just assign a sequence of commands as a button's operator, and you can build your own macros. Bug: Backspace now completely takes out a number you're entering on the stack.
1.1	May 16, 2005	Added Undo/Redo functionality Added error checking (division by zero, enough operands, etc.) Bug: A result of zero now gets entered on the stack properly
1.0.4	May 11, 2005	Commas are now supported as a decimal separator
1.0.3	May 9, 2005	Enter (on the numeric keypad) now works Fixed left/right shift (and key equivalents)
1.0.2	May 8, 2005	Corrected a parsing error with the conversion of negative numbers to fractions When a calculation is performed with a fraction as an operand, the result is now shown as a fraction Added key equivalents for ones' and twos' compliments
1.0.1	May 7, 2005	`rolln` and `rolldn` now work as they should Moved the base display to the top of the screen; it's not so much in the way there Can convert fractions back to decimals
1.0	May 5, 2005	Initial release

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