News

Version 1.4.0

Gabor Nagy — Mon, 19 Sep 2011 16:19:00 +0000

Verion 1.4.0 is now available from the app store. It has the following changes:

Redesigned the pan and pinch gesture handling code. A diagonal pinch always results in a proportional zoom, so it does not alter the grid's aspect ratio. A near vertical pinch only modifies the y-axis, while a near horizontal pinch works on the x-axis. The calculator also supports zooming and panning while graph is in "trace" mode.
The "shake to reset grid" feature defaults to a square grid. As opposed to -10 to 10 for both the x and y axis.
Removed the "Zoom mode" option from settings. Thanks to the new pinch handling code, it's no longer needed.
Removed the "Draw while touching" option from settings. It will always be turned "on" going forward.
Starting with this version iOS 4.0 or higher is required.

Right now, the iPad version of the calculator is a few versions behind the iPhone app, but an update is coming shortly to bring all of these features to the iPad app. The version numbers will be synced as well, so the iPad version will jump to 1.4 also.

Version 1.3.0

Gabor Nagy — Fri, 29 Apr 2011 15:51:32 +0000

Version 1.3.0 of the iPhone/iPod application was just approved by Apple, and you should be able to grab it from the App Store now. This update adds the following new features:

Added the ability to graph inequalities.
Added conditional statements that allow restricting the domain and graphing piece-wise functions.
Relocated the 'x' button, and made it blue. Many people were having problems finding it in the previous version.
Modified the calculator history so that both the input and the answer can be recalled, depending on which half of the screen is touched.
Created new functions for calculating the greatest common divisor and least common multiple.
Added nroot(), which allows you to calculate the nth root of x without having to use the power function.
Added logbase() for calculating the log of any base.
Added the atan2(x,y) function.
Fixed several minor bugs that people found since the last update. I would like to thank everyone that e-mailed me.

Note that all new features require iOS 4. The application will continue to work as before on iOS 3, but it will be missing these new features.

iPhone and iPod Touch Updates

Gabor Nagy — Wed, 27 Oct 2010 22:12:35 +0000

Version 1.2.0

Redesigned the keyboard so it can slide horizontally for the commonly used functions. (iOS 4.x and higher only)
The editor uses Apple's standard text view. This means you can now move the cursor with your finger, and it supports copy/paste. The arrow keys were removed from the keyboard. (iOS 4.x and higher only)
Added VGA output. This feature requires that you have an iPhone4, a 4th generation iPod Touch or an iPad. Earlier devices do not support Apple's VGA adapter.
Fixed a bug in the acsc() function, which caused it to return "syntax error".
Fixed a bug responsible disabling the "edit" button on the equation's tab.

Version 1.2.1
This update fixes bugs that were introduced in the 1.2.0 update. No new features were added.

Changed the equation editor so that moving the cursor is easier. The magnifying glass shouldn't be covered by the user's finger anymore.
Fixed a bug responsible for the equation editor keyboard to stick around after editing an equation.
Fixed a bug in evaluating user functions on the calculator screen.
When pressing the open parenthesis key, the app will automatically place a multiplication sign after numbers or variables.

A few people asked why the updated keyboard is not supported on firmware 3.x. In order to use Apple's standard UITextView along with a custom keyboard, I had to make use of an API that was introduced in SDK 3.2. Since the iPhone and iPod went from 3.1 directly to 4.0, I had to restrict the new keyboard to devices running 4.x or higher. Of course the old keyboard will continue to work on devices running firmware 3.x.

New Versions Are Now Available

Gabor Nagy — Tue, 03 Aug 2010 15:37:44 +0000

Version 1.1.10 for the iPhone/iPod, and version 1.0.2 for the iPad was approved by Apple last week. Right now, I'm only supporting video output on the iPad version of the application. Here are the release notes: Version 1.1.10 (iPhone/iPod Touch)

Fixed a sampling problem that resulted in vertical portions of graphs not being drawn.
Improved the root/intersection finding algorithm.
Added a proportional zoom option.
Fixed a problem related to the "ans" key.
Calculator history is now saved when you quit the app on iOS4.
Fixed several minor bugs that people found since the last update. I would like to thank everyone that e-mailed me.

Version 1.0.2 (iPad)

Everything you see listed for version 1.1.10 of the iPhone/iPod app.
Added video output support, which was requested by several teachers. You can now connect the iPad to an external monitor in order to display the graph view.
Added a left-handed keyboard layout option that repositions the number pad.

Video Output

Gabor Nagy — Thu, 01 Jul 2010 18:00:41 +0000

A feature that quite a few teachers requested recently is VGA output, so that they can display the graphs on a projector or TV. Actually, many people asked for this over a year ago as well, but there was no public API available in the iOS SDK. With the introduction of the iPad, Apple enabled developers to make this happen, and I will be supporting it in the next release. It will be available in both the iPhone and the iPad version of the calculator, and you'll be able to use any of the video cables (component, VGA, or RCA). The 2G and 3G iPhones will not support it because of performance issues, so you'll need at least an iPhone 3GS. Video Output

Version 1.1.9 (iPhone/iPod Touch)

Gabor Nagy — Thu, 01 Jul 2010 17:59:59 +0000

Last week, I released a new version of the Graphing Calculator for the iPhone (version 1.1.9). It's got the following changes:

Fixed a bug responsible for crashing the application on iOS 4.
Multitasking support that allows you to jump back to where you left off (only using iOS 4).
Updated the graph logic, buttons and icons to look great on the new retina display.
Changed the keyboard's click sound to match Apple's default keyboard.
Fixed a problem with the nPr() function.
Corrected an issue with gamma() and lgamma().

I had a good idea what my graphs would look like on the new retina display, but seeing it person was still shocking. I can not see the individual pixels that make up curves, which looks great. I would like to see a display with a similar pixel density for the iPad.

The iPad Version is Available

Gabor Nagy — Thu, 03 Jun 2010 23:08:15 +0000

Earlier this week, Apple approved the iPad version of the Graphing Calculator, and it's now available for download. This first version matches the feature set of the iPhone application, but it's easier to use. The GUI was rewritten from the ground up to take advantage of the iPad's bigger screen. iPad Screen Shot

iPad News

Gabor Nagy — Thu, 22 Apr 2010 01:43:27 +0000

Version 1.1.8, which just has a few bug fixes, is now available for download. Quite a few people have asked me whether or not an iPad optimized version is coming. The answer is yes, and I started working on it the day I received my iPad. I will try to get version 1.0 finished within a few weeks from today. The first version will match the feature set of the iPhone version, but as time goes on it will be able to display much more information thanks to the bigger screen. A friend of mine told me he saw my calculator pre-installed on an iPad demo unit at a Best Buy. I just had to go see it for myself, and I found my application pre-installed at the local Apple store as well. A picture of me at the Apple Store The iPhone version works well enough on the iPad that Apple decided it was a good demo for iPhone backwards compatibility. The buttons and fonts are huge, and it's a bit pixelated, but it works well. If you wish to take a look before you buy my app, visit an Apple store (or Best Buy) and you can play with it on an iPad demo unit.

Version 1.1.7

Gabor Nagy — Sat, 17 Apr 2010 00:33:58 +0000

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.

Making a Living on the App Store

Gabor Nagy — Wed, 24 Mar 2010 03:02:30 +0000

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.