iGraphmatica

December 16, 2014

This app has been updated by Apple to display the Apple Watch app icon. Fix application hang when trying to display the equation error popup on iOS 7/8 in versions 2.3.6 and 2.4.0.

December 9, 2014

1. Curves are now highlighted when you touch them or select their equation in the droplist. 2. Added Pick Line Style to the context menu for equations, allowing you to choose from solid, dashed, dotted, and dash-dot line styles. 3. Fixed size of Pick Graph Color popover on iOS8.

November 11, 2014

1. Fixed bug causing Pick Graph Color dialog not to appear on iOS8. 2. Fixed a problem which could cause ODEs (and implicit Cartesian functions) to fail to register (and later disappear) rather than just stop drawing when the approximation hits an error. 3. Fixed graphs of x < 1/y and other inequalities with asymptotes that are functions of y, not x. 4. Graph any equation/inequality that is explicitly specified as x=f(y) as a function of y even if it can be solved for y instead. 5. Added Delete Graph and Clear Screen items to Tools menu, for ease of access (and to allow deleting slope-field graphs). 6. Changed highlight color used for crosshairs and selected domain region to be black rather than white when any high-luminance background color (not just pure white) is selected. 7. Fixed potential startup crash on iPod Touch running iOS 8. 8. Eliminated extra vertical asymptote drawn as part of y=acot x. 9. Fixed crash trying to load graph document with an equation that has an error.

November 3, 2014

1. iOS8 compatibility fixes 2. Fixed bug which could cause graphs to be drawn slightly past the end of their specified domain. 3. Find All Graphs now adjusts the range based only on the requested domain of the equations (rather than the maximum possible values that would be visible on the screen with an unrestricted domain). 4. Fixed-increment Cartesian, polar, and parametric graphs (with a third parameter in their domain to specify the interval between graphed points) are now drawn as a series of dots rather than line segments. Point tables for these graphs display the set of the points graphed. 5. The parser will now accept functions that are run together with their parameter, e.g. y=sinx. 6. Added support for specifying powers of functions before the parameter e.g. y=sin^2x or y=cos²x

May 19, 2014

- Fixed crash in cubert (∛x) function when x < 0. - Fixed issue with persisting a switch back to one of the standard color schemes from a custom scheme (for sure this time!).

May 7, 2014

Fix a potential crash when displaying an error for a bad equation.

April 2, 2014

- Differentiable single-variable equations / inequalities (e.g. 1/x - 2 > 0) are now solved and rendered more accurately by a new algorithm that uses Newton's method to find all of the potential solutions and boundaries. - Improved display of equation parsing errors to indicate the position of the problem where applicable. - Fixed crash when computing critical points for equations containing an expression like "x+0". - Fixed a number of issues with displaying "holes" in graphs and the Find Critical Points dialog box. - Fixed issues with persisting custom colors for graphs and reverting to the default color scheme. - Fixed performance issue with custom keyboards when large items are on the clipboard.

February 20, 2014

Fix program icon in the app store

February 13, 2014

- More colors! There are now 16 slots for graph colors and a palette of 128 possible colors to choose from. - Choose Graph Document dialog now allows you to delete documents you no longer need. - Fixed text size when printing from Retina devices - Printing with "Color with White Background" selected for the Printed Color Scheme no longer changes to the standard white color scheme if you have defined a custom color scheme and the background is already white. - Fixed rendering of dashed lines for strict inequalities when "Draw graphs with wide lines" option is selected. - Fixed bugs in Pick graph color (strict inequalities were changed from dashed to solid lines and domain endcaps in piecewise-defined functions were not consistently updated)

January 3, 2014

Fixed numbers in equation keyboard after switching to new symbol panes and back.