Update 1.15

Version 1.15 is now on Google Play.  This add English descriptions to steps ( Plus version only).  It also fixes some bugs.

Steps Update and Screenshot

Here is a screenshot of what the new steps screen will look like in the next update.  These changes will only be effecting the paid version of the calculator since only the paid version can view the steps performed.

Each step will first have an English description.  Some of the descriptions will have formulas to help explain exactly what it is doing.  For example, in the image above, the first step shown says "Factor difference of two squares."  It then has the formula for factoring two squares, which is a^2-b^2=(a-b)(a+b).  The next line after the description is the expression that the step started with.  The items highlighted in green are what the step is changing.  The next line is the resulting expression for the step.  The changes from the original expression are in blue.

Most steps will have the green and blue highlights for what is changing.  However, not all of them will.  Some steps may just have a description with the resulting expression.

Calculation Steps

When I decided I wanted to write a calculator for Android, I knew one of the features I wanted it to have was to be able to show the user the steps the calculator performed to get the result it did.  This was something I hadn't seen any other calculator on Android do and something I thought would be very useful to many people.

This feature is available in the paid version.  However, in its current form it is fairly basic.  I have long wanted to provide descriptions for each step and make it easier to see what is changing between each step.  For the next update I am working on doing just that.  Once I get enough of it working, I will post a new entry with screen shots (will be at least a couple weeks).

Release 1.14

Version 1.14 is now on Google Play.  This adds the ability to graph inequalities.  There is also now an Advanced Pinch-Zoom setting.  Enabling this causes the width/height ratio to no longer be fixed when pinch-zooming.  Finally, there are also so bug fixes.

Graphing Inequalities

Currently the calculator can solve inequalities but it can not graph them.  For the next update, I am working on adding the ability to graph inequalities when in Cartesian graphing mode.  Not only will it graph simple inequalities such as y<x+1, but also more complex inequalities such as the circle x^2+y^2<1.

Version 1.13.1

A small update was made today.  The update fixes some incorrect traces on graphs.  Thank you to those who reported these errors so I could fix them!

Basic text entry

The next update will include an option for "Basic text entry".  What does that mean?  Well currently expressions are formatted as you enter them.  Division is shown with a horizontal bar separating the dividend and divisor, and exponents are displayed in the superscript position.  This is similar the the way you would write down the expressions on paper.  However, not everyone may prefer this input method, especially if you are using a physical keyboard.

The basic text entry will act more like a text box for entry.  Division will use the '/' character and exponents will use the '^' character.  In addition, when in basic text entry you will be able to paste expressions from the android clipboard.  For example, if you see the expression sin(pi/2)^2 in another android app, you can copy it from that app and paste it into our calculator (you can only paste it if you are in basic text entry mode) to execute down.

Results will always be displayed in the current formatted way.  Another addition to the update, is anytime you copy the formatted result, it will be placed in the android clipboard as text.  This way you can copy results into other apps.

More information about this new entry will be posted in a tutorial on the website when the update it released.