iPhone application written by a CAG - 10% of proceeds going to Child's Play

bjlarson2

bjlarson2

CAG Veteran
Hi, I'm a quiet CAG who lurks far more often than he posts. I'm also the author of a new iPhone / iPod touch application called Pi Cubed, which just became available for $9.99 on the iTunes App Store. Pi Cubed is an application for performing math as you would on a piece of paper, where a touch-based interface lets you input calculations that are typeset and evaluated in realtime. It also contains a library of over 150 equations from a variety of fields, including finances, engineering, and physics. The first link above takes you to the main application page, which has a video that demonstrates the application better than I can explain in a post.

This application may be of particular use to students here, although there may be a few more engineers and scientists in the crowd. Such people may also be interested in my other iPhone application, a free molecular visualizer called Molecules, which has been available since the launch of the App Store and was the eighth most downloaded free utility in 2008.

I have also elected to donate 10% of my net proceeds from the sale of Pi Cubed to the Child's Play charity. I know that their fundraising drive tends to be seasonal in nature, but I wanted to do more to help such a good cause.

If you feel that this is spam, please let me know and I will remove this post. I just figured that this application would be of interest to some members of the CAG community.
 
Apple takes a 30% cut, so I end up with $7 for every unit sold (depending on the currency conversion rate for all the countries it's sold in). Seeing as how they handle the hosting, payment processing (in a whole mess of countries), and even some advertising of these applications, I think it's a pretty good deal.
 
Just watched the video; that actually looks pretty sick. Can I see what equations are in the physics (or, for that matter, any library) anywhere?

And is it possible to annotate your own saved equations?
 
[quote name='Liquid 2']Why call it Pi Cubed, OP?[/QUOTE]

It's surprisingly difficult to find unique math-related names. No one had a trademark on this one.

As far as which equations are in the physics portion of the library: centrifugal force, force, force of a spring, natural frequency, period, and position of a free vibration, friction, kinetic energy, potential energy, projectile motion, road curve banking, rotational acceleration, laws of straight-line motion, and torsional vibration.

The full manual to the application is available here, and lists all of the equation categories (although not all of the equations).

I'm an engineer by training, so that's where the equations tend to lean.

As far as custom annotations, it's a feature that's not in the application yet (I use a custom desktop client to input all the built-in equations), but I should be adding it within a couple of months. I'm focusing on adding unit support (length, velocity, etc.) to numbers in calculations right now.
 
Right now my focus is primarily around electric and magnetic equations. These are relentless compared to kinematics. Are any of these featured in the app?
 
[quote name='Magehart']Right now my focus is primarily around electric and magnetic equations. These are relentless compared to kinematics. Are any of these featured in the app?[/QUOTE]

The equations that I have in the application are limited to those that can be numerically evaluated. I have two screenshots from within my desktop equation entry application (that I use to build the equation library) showing the electrical engineering equations currently in Pi Cubed: image 1, image 2. I don't have any partial differential equations or other complex expressions.

If there are ones missing from my list that you'd like to see in there, please let me know and I'll add them.
 
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