User Guide

Math.cos() 349

Description

Method; returns the ceiling of the specified number or expression. The ceiling of a number is the

closest integer that is greater than or equal to the number.

Example

The following code returns a value of 13:

Math.ceil(12.5);

See also

Math.floor(), Math.round()

Math.cos()

Availability

Flash Player 5. In Flash Player 4, the methods and properties of the Math class are emulated using

approximations and might not be as accurate as the non-emulated math functions that Flash

Player 5 supports.

Usage

Math.cos(x:Number) : Number

Parameters

A number that represents an angle measured in radians.

Returns

A number from -1.0 to 1.0.

Description

Method; computes and returns the cosine of the specified angle in radians. To calculate a radian,

see “Description” on page 344 of the Math class entry.

Example

The following example displays the cosine for several different angles.

trace (Math.cos(0)); // 0 degree angle. Output: 1

trace (Math.cos(Math.PI/2)); // 90 degree angle. Output: 6.12303176911189e-17

trace (Math.cos(Math.PI)); // 180 degree angle. Output: -1

trace (Math.cos(Math.PI*2)); // 360 degree angle. Output: 1

Note: The cosine of a 90 degree angle is zero, but because of the inherent inaccuracy of decimal

calculations using binary numbers, Flash Player will report a number extremely close to, but not

exactly equal to, zero.