Equation Grapher

Description :: All Functions

Enter an Equation using the variables x and/or y and an =, press Go and wait:

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Description

It can plot an equation where x and y are related somehow (not just y=...), like these:

Examples:

x^2+y^2=9 (an equation of a circle with a radius of 3)
sin(x)+cos(y)=0.5
2x-3y=1
cos(x^2)=y
(x-3)(x+3)=y^2
y=x^2

If you don't include an equal sign, it will assume you mean "=0"

It has not been well tested, so have fun with it, but don't trust it.

If it gives you problems, let me know.

Note: it takes a few seconds to finish, because it has to calculate every pixel.

If you just want to graph a function in "y=..." style you may prefer Function Grapher and Calculator

Zooming

To zoom into an area, select an area with the mouse (click, hold down and drag, then release). The area you selected will be the new bounds.

If you just click-and-release (without creating a rectangle), then the spot you clicked on will be the new center

You can zoom out using the Out 2X or Out 10x button.

To reset the zoom to the original bounds click on the Reset button.

Important Note: Extra Lines

There will sometimes be lines drawn where they really shouldn't be, because you are asking the graph to draw impossible things.

Example: 1/(x-1)

1/(x-1) is undefined at x=1 (because you would be dividing by zero). The vertical line should not be there, but the program does not know any better.

Wrong

Another example is the tan() function. You may discover more, so just be careful.

Known Bug

There are some equations it cannot plot at all. To find any point the program looks for where the equation changes sign ... this works nearly all the time except for equations like (x-y)²=0 which is always positive, or zero. Note: If you change the equation to (x-y)²=0.1 it works nicely

I am trying to think of how to fix this! Contact me if you have an idea.

All Functions

Operators

	+	Addition operator
	-	Subtraction operator
	*	Multiplication operator
	/	Division operator
	^	Exponent (Power) operator

Functions

	sqrt	Square Root of a value or expression.
	sin	sine of a value or expression
	cos	cosine of a value or expression
	tan	tangent of a value or expression
	asin	inverse sine (arcsine) of a value or expression
	acos	inverse cosine (arccos) of a value or expression
	atan	inverse tangent (arctangent) of a value or expression
	sinh	Hyperbolic sine (sinh) of a value or expression
	cosh	Hyperbolic cosine (cosh) of a value or expression
	tanh	Hyperbolic tangent (tanh) of a value or expression
	exp	e (the Euler Constant) raised to the power of a value or expression
	ln	The natural logarithm of a value or expression
	log	The base-10 logarithm of a value or expression
	floor	Returns the largest (closest to positive infinity) value that is not greater than the argument and is equal to a mathematical integer.
	ceil	Returns the smallest (closest to negative infinity) value that is not less than the argument and is equal to a mathematical integer.
	abs	Absolute value (distance from zero) of a value or expression
	sign	Sign (+1 or -1) of a value or expression

Constants

	pi	The constant π (3.141592654...)
	e	Euler's number (2.71828...), the base for the natural logarithm