Apps

Piano

It is full 88 keys virtual piano. The feature includes:

    1. Record piano play track
    2. Record voice song track
    3. Record every keys you have played
    4. Generate Music Notation Sheet
    5. Email sound track and music notation sheet
    6. Simple and easy to change keyboard.  
    7. Double keyboards on the screen (iphone)

News: This app supports iPad natively with full width and height.

Since all keys are recorded while playing, it can be used for many purposes. For example, you can use to record music or you can use to train someone to see whether they remember all keys for a particular song. Furthermore, you can email the soundtrack and sheet music to anyone.

This application only records the note in one beat. To compose music, please check out “Composer” Application.

User Guide


How to start?

Besides you can play the piano, but you can record the note and send the music sheet you have just played to an email. Just tap Record button, play the music and, then tap on the Email.

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Apps

Graphic calculator 3D

Graphic calculator 3D: It is the scientific graphing calculator which can plot 2D and 3D graph. It is similar to Texas Instruments TI-83, TI-84. It has more features such as plotting 3D graph for mathematics functions.

News: This app supports iPad natively with full width and height.

Features: 
   ✓ plot 2D and 3D graph 
   ✓ plot multiple functions on one graph
   ✓ any plot function will be saved and can be edited and plotted later.
   ✓ send email with the graph after you done.
   ✓ easily zoom in and out on the graph
   ✓ can operate on very large number mathematics.
   ✓ convert number to any base
   ✓ compute permutation, combination   - compute greatest common denominator
   ✓ compute least common multiple of a set of rational numbers
   ✓ compute factorial and fibonacci number.
   ✓ provide many trigonometric functions
   ✓ calculate the norm of value
   ✓ provide matrix addition, multiplication
   ✓ compute matrix determinant, inverse matrix.
   ✓ stream line interface so you can easily change the input with finger.
   ✓ copy/paste your result to any other application
   ✓ provide many other scientific functions
   ✓ build-in Help manual for user.

After you use this graphing calculator, you will never want to use any other graphing calculator. It is very simple and easy to use.

Functions in scientific graphing calculator:
   ➺ it can plot f(x), f(x,y)

   ➺ The following math functions you can use to plot 2D and 3D Graph:        
            ✓  abs, norm, rand, acos, 
            ✓  sin, cos, tan, asin, atan, 
            ✓  sinh, cosh, tanh, log, ln, exp, sqrt, 
            ✓  any linear, quadratic or  x to n, exponential functions. 

   ➺ The following math functions you can use for calculation:
        ✓ max, min, avg, gcd, root, cot, coth
        ✓ asinh, acosh, atanh, base, perm, comb,
        ✓ ceil, floor, round, lcm, fib

   ➺ The following function use to compute matrix              
             ✓ determinant:  det(x)
             ✓ inverse matrix:   inverse(x)

User Guide

To try out some graphing capabilities, please click “hist” button (orange button), select a function, click “Plot” button. You will see those sample graphs. We have tested it on iPad, iPhone. It works. If you don’t see the graph, most likely you enter the wrong formula!! Please be aware!

To start to calculate, simply enter:

3*4+12*122
Click button “ans”. The result will be returned to you.
To Plot a linear function, simply enter:
3*x+5

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Click “Plot” button. You do not need enter “y=” in the front. It is wrong if you enter: y=13*x+6 because it assumed it is a function of x or y or both. It is also wrong if you enter 13(x)+6. For example, if you want to plot f(x,y)=3*x+4*y, you only need input the second part. Note that you need math operator for any math formula.

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To access “Help” document. Click button “Hist” and click “Help.
It is highly recommended that you read the “Quick Start Guide” in built-in Help document before use this application.

How to define a variable and use for calculation later?

Just assign a variable with value:

	
	x=3.14
	100*x
	200*x
	300*x

Tap “ans” button to get the answers: 314, 628, 942

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How to add more than one function?

Just tap “Edit”, then “Add more function” on the function page, After you enter the function such as 2*sin(x), Tap “Use” button. Certainly, you can change the X, Y range to get what you want. Z range is only used when you set the graphing type to 3D.

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How to draw 3D graphics?

First, you will need to change the graphing type to be 3D instead of 2D on the function page. then click “Plot” button, a 3D graph will be shown such as:

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