Equation Grapher

Description :: All Functions

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

(Note: there is also the Flash Version.)

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 rigth 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.
  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.
  round Round to the nearest integer. Examples: round(-2.5) = -2, round(-0.1) = 0, round(0.1) = 0, round(2.5) = 3
  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