Programmer Patrik Lundin .NET, Java, JavaScript, Math expression parser

Author Patrik Lundin, patriklundin.info, http://www.lundin.info

» Description
» How to setup the applet
» All functions

The GraphApplet 1.06 is a full featured Graphing Calculator with some rare features added.

The GraphApplet has all the common operators and functions as expected from any scientific
calculator and combines it with function graphing capabilities.

The GraphApplet supports implicit multiplication which means you can write your expressions just as you
would write them on a piece of paper, for example xcos(x) or 5x^3-6x

The GraphApplet has support for symbolic differentiation using the diff function.

To use the applet as a calculator click on the buttons or use the keyboard to form your expression
and then press enter or click the Eval button to evaluate.
Note that when you click on a function button it will fill in a left parenthesis, you will have to match it
with a right parenthesis either by clicking on the ) button or enter it with the keyboard.

To draw a function enter the function by clicking on the buttons or enter them with the keyboard
and then press the PlotF button, you can only draw function of type y=f(x) .
To zoom into an area, select an area with the mouse ( click, hold down and drag ) and release,
the area you selected will be zoomed in, to zoom out use the ZOut button.
To reset the bounds to the original x:[-10,10] y:[-10,10] click on the Reset button.

To clear the input field click the Clear button, to clear a individual drawed function double click on the
function name in the list to the right of the applet or click on the Cls button to clear the whole screen.

To enter something into memory first click the M-> button and click on either m1 or m2,
to clear the memory first click on MCls and then either m1 or m2

Follow these steps to setup the applet on your webpage:

1. Download the applet here

2. Copy the files called ilmath.jar and gapplet.jar to the same folder as your web pages are in.
( If you are using ftp make sure the files are uploaded as binary and not ascii. )

3. Copy this applet HTML tag to the page where you want to use the applet :

<applet archive="gapplet.jar" code="GraphApplet.class" width=655 height=360>
</applet>

4. Open the page in a webbrowser that supports Java and start using the GraphApplet.

Calculator Controls

Eval	Evaluates an expression, the calculator first tries to evaluate the expression, if it fails then it tries to draw the expression.
Clear	Clears the input area.
PlotF	Plots a function of type y=f(x)
ZOut	Zooms out the current area with a factor of x2. ( to Zoom into an area, select the area with the mouse and release. )
Reset	Reset the bounds to the original x:[-10,10] y:[-10,10]
Cls	Clears the whole drawing area and all functions. ( to clear a individual function double click on the function in the list to the right of the applet. )
M->	Enters an expression or a value into memory, first click this button and then chose either m1 or m2
MCls	Clears the memory, first click this button and then on either m1 or m2 to clear that memory. ( note that memory will be gone if you leave the page with the applet and then return at a later point. )
m1	Memory 1
m2	Memory 2

Operators and Functions

These operators can be entered either with the buttons on the calculator or through the keyboard.

sqrt	sqrt of a value or expression.
sin	sin of a value or expression.
cos	cos of a value or expression.
tan	tan of a value or expression.
atan	atan of a value or expression.
acos	acos of a value or expression.
asin	asin of a value or expression.
acotan	acotan of a value or expression.
exp	exp of a value or expression.
ln	ln of a value or expression.
10log	The 10 logarithm of a value or expression.
fac	The faculty of a value or expression.
diff	Symbolically differentiates an expression of one variable.
pi	The constant PI (3.141592653589793)
euler	base for the natural logarithm (2.718281828459045) .
+	Addition
-	Subtraction.
*	Multiplication.
/	Division.
^	"Power to" operator

These additional operators can be entered only through the keyboard.

sinh	Hyperbolic sine
cosh	Hyperbolic cosine
tanh	Hyperbolic tangens
abs	Absolute value of value or expression.
ceil	Returns the smallest (closest to negative infinity) value that is not less than the argument and is equal to a mathematical integer.
floor	Returns the largest (closest to positive infinity) value that is not greater than the argument and is equal to a mathematical integer.
sfac	Semifaculty of value or expression.
round	Rounds the argument to the closest mathematical integer. Example: round( 3.4 ) = 3.0, round( 4.99 ) = 5.0 etc...
fpart	Returns the decimalvalue of its argument
[base]log(...)	Any logaritm. Example: 10log(10) = 1.0, exp(1)log(exp(1)) = 1.0
%	Modulo
==	Equal, returns 1.0 if it's arguments are equal or 0.0 othervise.
!=	Not Equal, returns 1.0 if it's arguments are not equal or 0.0 othervise.
&&	And, returns 1.0 if both arguments evaluates to 1.0, or 0.0 othervise.
\|\|	Or, returns 1.0 if any of it's arguments evaluates to 1.0, or 0.0 othervise.
>	Larger than, returns 1.0 if the value of the argument to the left is larger than the value of the argument to the right, or 0.0 othervise.
<	Less than, returns 1.0 if the value of the argument to the left is less than the value of the argument to the right, or 0.0 othervise.
>=	Larger than or equal to, returns 1.0 if the value of the argument to the left is larger than or equal to the value of the argument to the right, or 0.0 othervise.
<=	Less than or equal to, returns 1.0 if the value of the argument to the left is less than or equal to the value of the argument to the right, or 0.0 othervise.
!	Not, returns 0.0 if it's argument evaluates to 1.0 and returns 1.0 if it's argument evaluates to anything other than 1.0