Graphing Calculator

Version 1.1.7 was just approved by Apple, and you should be able to download it within a few hours. It has the following new features:

• Added the ability to find local minimums/maximums while tracing the graphs.
• Added the following trigonometric functions: asinh(), acosh(), atanh(), cot(), csc(), sec(). The inverse hyperbolic functions were requested by many people.
• Added the following new functions: gamma(), lgamma(), nCr(), nPr(), min(), max()
• Fixed the sin(asin(x)) graphing problem discovered by Sven Hörbeck.
• The function selection page now has a fixed cancel button up top.
• Added a comma button to the keyboard in order to support functions with multiple input parameters.

Over the past few months, I received many good suggestions and feature requests, but I have not had time to implement all of them. I was very busy, and as some of you may have noticed, version 1.1.6 was the first update since October 2009. I realized that I’m not able to dedicate enough time to this graphing calculator next to a full-time software engineering job, which means I had to make a difficult life changing decision.

I had a stable job that paid a competitive salary, but what I really enjoyed working on was my side projects and this calculator. To follow my dreams, I decided to quit my job and dedicate all of my time to mobile application development. This means I will dedicate my full attention to this graphing calculator starting next Monday. Expect to see many new features and more frequent updates over the next few months.

If you enjoy using this calculator, and you would like to help me keep the price at $0.99, I would appreciate if you took a minute to rate the application on iTunes.

I recently released version 1.1.6, and it was approved by Apple in less than 24 hours. You should be able to update the application if you haven’t already. It has the following new features:

• Redesigned the calculator screen so that it’s easier to use.
• Enlarged the buttons.
• Added the ability to fix or edit previous calculations.
• Calculator history is saved even if you restart the application.
• Redesigned the equation editor for improved usability.
• Added an option to zoom only the x or only the y axis.
• Due to popular demand, there is now a square root button on the main keyboard.

Version 1.1.5 is ready. You should be able to download in about two weeks from today.

• Added polar and parametric graphing support
• Added a random integer function
• Improved graphing speed, which was needed for the more complex polar/parametric graphs
• A few minor bug fixes and improvements

Recently, quite a few people e-mailed me about the status of the polar/parametric graphing feature, so I decided to post a status update on here. I worked on it quite a bit this weekend, and it’s very close to being ready. I plan to submit version 1.1.5 of the calculator to Apple within a week. I hear that Apple takes around two weeks to approve updates lately, so my current estimate is that you’ll be able to download it within three weeks.

I also spent some time changing the look and feel of this website. The header image actually has two screen shots showing off the polar and parametric graphing support. The smiley face was created using 4 parametric equations, and the polar graph is showing the graph for: r(θ) = sin(10 * θ / 7).

In addition to adding polar/parametric graphing support, I fixed a few minor problems and improved the graphing speed. I have some really good ideas on how to improve the usability of the calculator screen. Many of you sent me great suggestions, and I would like to thank all of you. Version 1.1.6, which I’m going start working on shortly, will have a completely redesigned calculator screen with a large number of new features. I’ll post more details once I get closer to releasing it.