# Equation Grapher

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

## 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 equals 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 may take a few seconds to finish, because it has to do lots of calculations.

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

## Zooming

Use the zoom slider (to the left zooms in, to the right zooms out).

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

## Dragging

Click-and-drag to move the graph around. If you just click-and-release (without dragging), then the spot you clicked on will be the new center

Note: the plots use computer calculations. Round-off can cause errors or values can be missed completely.

## All Functions

### Operators

+ Addition operator Subtraction operator Multiplication operator Division operator Exponent (Power) operator

### Functions

sqrt Square Root of a value or expression. sine of a value or expression cosine of a value or expression tangent of a value or expression inverse sine (arcsine) of a value or expression inverse cosine (arccos) of a value or expression inverse tangent (arctangent) of a value or expression Hyperbolic sine (sinh) of a value or expression Hyperbolic cosine (cosh) of a value or expression Hyperbolic tangent (tanh) of a value or expression e (the Euler Constant) raised to the power of a value or expression The natural logarithm of a value or expression The base-10 logarithm of a value or expression Returns the largest (closest to positive infinity) value that is not greater than the argument and is equal to a mathematical integer. Returns the smallest (closest to negative infinity) value that is not less than the argument and is equal to a mathematical integer. Round to the nearest integer. Examples: round(-2.5) = -2, round(-0.1) = 0, round(0.1) = 0, round(2.5) = 3 Absolute value (distance from zero) of a value or expression Sign (+1 or -1) of a value or expression

### Constants

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