Graphing/Scientific Calculator

Graphing/Scientific Calculator

by calculator-grapher.c 250 downloads, 253 kb


File size:
253 kb
File os:
android 1.5+/.apk

Click to download

Exceptionally powerful, and yet the most user-friendly calculator on the market. In addition to normal scientific calculations, e.g., 1/2+3^2-4sin(2π/5), you can graph a function f(x) using either Cartesian or polar coordinate system; solve a one-variable equation f(x) = 0; calculate derivative, f '(x); compute definite integral and area under a curve, and display a table of function values on an interval.

Your expressions can include any of the following
* Basic algebraic operations
* Trigonometric functions and their inverses
* Hyperbolic functions and their inverses
* Exponential and logarithmic functions
* Absolute value and step functions.

If your expression is incomplete or if you make a syntax error the = sign changes to ? mark, touching it gives you a feedback by precisely indicating the error.

Enter a function f(x) and press Graph. For convenience, the graphing calculator appends a default interval to the function expression and draws the graph on that interval. You can change the endpoints of the interval, of course.

Touching Polar on the upper right of the graphing area, the graph of the function is drawn using the polar coordinate system.

Touch and drag the graphs to see the required region. To center the graph on the screen, touch the coordinate indicator on the top left of the graphing area.

Touch ++ or -- on the lower right corner of the graphing area to zoom in or zoom out. Touch the lower left corner of the graphing area (where the caption is) to reset zoom.

Solve one-variable equations. The calculator finds the roots (x-intercepts) of a function on a bounded interval by solving the equation f(x) = 0. If the interval displayed is not bounded you will need to change the endpoints.

Press f '(x) to calculate the derivative of f(x).

Definite Integral and Area
To compute the definite integral of a bounded function and also the area between its graph and the x-axis on a bounded interval, long press the Solve button. Both values are computed and displayed.

Table of Values
Press f(…), which appears in place of the = sign when you type in a function, to display a table of values for a non-constant function.

Most keys are assigned a second functionality by long pressing them as follows.

* Long press of the back-space button x←: Clears the input box. Immediately after pressing it will display back the deleted expression. It can also be used to restore the keypad to its original state (if the keypad layout has changed) without deleting any character.

* Long press of left parenthesis: Moves the cursor one space to the left.

* Long press of right parenthesis: Moves the cursor one space to the right.

* Long press of ^ (power) sign: Appends 'intvl=(' to the expression if it is not already appended. Long press of decimal point inserts comma to separate the end-points.

* Long press of 0 (zero): Inserts ∞ (infinity).

* Long press of any digit key: inserts the reciprocal of the digit enclosed with parentheses. (Long press of 1 inserts the imaginary unit i, although complex numbers may not be applicable in this version).

* By pressing the check boxes on the bottom right of the calculator, you can display the inverse trigonometric, hyperbolic and inverse hyperbolic functions.

* Long press of Solve: Calculates the definite integral and also the area.

* Long pressing the function keys sin, cos, log,... displays their graphs.

All of the above with more details and options are included in the built-in help of the calculator menu.

The powerful gCalcD Graphing Calculator with Derivatives for Android is designed for devices where a hardware keyboard is not available and/or the screen size is limited. So, get it for your smart-phones and tablets. Don't miss it!

Latest version: 1.0 (for Android version 2.1 and higher)
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