PocketCAS: Computer Algebra System for the iPhone

Version 2.6.2 - upcoming

New feature: In PocketCAS pro for iPad, the display will be mirrored to any external screen now.
New feature: Added Bessel functions of first and second kind.
New feature: You can now share documents via iTunes in order to transfer them to other devies (iOS 4 and iPad only).
New feature: Added singular value decomposition (svd) and QR factorization (qr) for devices with iOS 4.
Improvement: Improved the keyboard appearance on the iPhone.
Improvement: The DiGamma function (also known as Psi function) can now be plotted.
Improvement: Updated to the newest version of the CAS kernel.
Improvement: You can send support requests from inside the application now.
Improvement: Removed some almost unused settings.
Improvement: Optimized compatibility with iOS 4 and iPhone 4.
Improvement: Added a list of differences between PocketCAS lite and PocketCAS pro.
Improvement: You can upgrade to PocketCAS pro from within the application now. There's also a bundle for iPad + iPhone at a discounted price.
Bugfix: Improved the reliability of the alphanumeric keyboard.
Bugfix: Improved the reliability of function plots.
Bugfix: Plotting e.g. x^x now works properly.
Bugfix: PocketCAS no longer crashes when saving documents containing variables with units.
Bugfix: Saving functions in a document works properly now.
Bugfix: Several minor bugfixes for the iPad version.

New feature: Parametric plotting! The command "x^2,x" will plot a parabola for example. See the plotting tutorial for more details.
Improvement: Removed some useless units.
Improvement: The CAS section of the new keyboard shows more buttons now.
Improvement: Appropriate tips will now be shown when pressing the keyboard, ^(-1), hyp and trigonometric keys for the first time.
Improvement: If there is no last session available, the default tutorial will be loaded instead.
Cosmetical change: Renamed the 'back' button from 'Session' to 'Cancel'.
Cosmetical change: Renamed sessions to documents.
Cosmetical change: Pressing 'Save' rather than 'Go!' will now erase the result in the document view.
Bugfix: Rotating with the iPhone keyboard will not mess the keyboard up anymore.
Bugfix: Fixed integration of periodic functions.
Bugfix: Fixed erf(x) for x < -3.
Bugfix: Some other bugfixes on the CAS kernel.

Improvement: Reduced the delay after the first press of a keyboard button.
Improvement: The axis system will now be shown when dragging a graph.
Improvement: Tutorials can now be edited in PocketCAS lite.
Improvement: New short "1st steps" tutorial with very basic instructions.
Improvement: Added separate symbols for _epsilon0_ and _mu0_.
Improvement: You can now choose the "Classic" design in Settings.app which feels slightly faster.
Improvement: Added links to rate PocketCAS and for email support to the app.
Change: Made the new keyboard style the default. You can still select the old style in the Settings application.
Bugfix: Improved display of custom functions like (x)->x^2.
Bugfix: Improved display of lines that are wider than the display.

New feature: Added 2D cartesian and polar plotting functionality with a corresponding tutorial.
New feature: Added a physical unit calculator with constants, plus a tutorial for it.
New feature: Added a new keyboard design with swiping features. You have to enable it in Settings.app.
New feature: Added a 'please rate PocketCAS' dialog.
New feature: Added tips that will be shown on startup.
New feature: Added 'New' and 'Delete' controls to the session view.
New feature: When you tap the title of the calculation editor's navigation bar, the iPhone keyboard will show up.
Improvement: Made the interface a lot more beautiful.
Improvement: The UI is more responsive now.
Improvement: Added some fancy animations to the text selection.
Improvement: The calculation editor's font size can be changed now.
Improvement: Added German translations for some undo actions and FAQ.
Improvement: Enabled comments to begin behind the beginning of a line.

Added a landscape mode with bigger keys: the landscape keys are 28% larger than those in portrait mode.
Added preferences for even larger keyboards (up to 25% bigger, 60% in total). You can find them in Settings.app.
Added descriptions to Undo operations.
You can now undo changes, inserts and deletes of calculations.
Updated to the newest version of the giac CAS kernel.
Created a German localization. FAQ, About and Function Reference are still in English.
Several minor improvements to make everything work more smoothly.