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RPN calculator


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A simple RPN calculator that works like the built-in calculator.  Requires spaces as delimiters between elements in the expression.  Built using deanishe's Alfred python library.

 

e.g.

 

19 2.14 + 4.5 2 4.3 / - *

 

produces an Alfred result:

 

85.2974418605

Action this item to copy this number to the clipboard

 

There is a single keyword:

 

rpn

 

Download link: 

 

https://www.dropbox.com/s/9ay1z2mubifcun6/RPN Calculator.alfredworkflow?dl=0

 

2018-07-10: updated with working link

2020-07-26 updated with latest version of deanishe's Alfred python library.

Edited by dfay
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  • 4 years later...
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  • 1 month later...

@dfay Thank you, thank you! I am in your debt. I literally upgraded Alfred just for this.  

 

When I'm on Slack and need to complete a sentence like "we frobnicated 6,122,849 doodads between 8:28 and 12:49, a rate of one million every..."  – which seems to be a lot of my life the past few weeks – there is nothing so useful as a good RPN calculator, and none so close to hand and fast to use as yours. Thank you.

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  • 8 months later...

@dfay, thanks for this workflow. FYI workflow needs "0" in front of decimal for it to work - for example "RPN 100 .1 *" would end up with wrong result, it needs "RPN 100 0.1 *". Is it by design or potential bug?

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I'd like to say it's by design but it's actually an artifact of the crazy regular expression in rpn.py line 42:

 

ops = map(lambda y: y.replace(' ',''), re.split('\s|(?<!\d)[,.]|[,.](?!\d)',query))

 

 

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Ok. Just have to be careful when entering decimal numbers, habit of keying without leading "0". Only discovered this "issue" when result came out too big. It interprets ".10" as "10" 😲

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