atan2: Difference between revisions
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'''Notes:'''<br> | '''Notes:'''<br> | ||
'''atan2''' is safer than the alternative [[atan]]. | '''atan2''' is safer than the alternative [[atan]]. | ||
This is because '''atan2''' will correctly return the angle when the tangent is infinite:<br> | |||
1 '''atan2''' 0<br> | 1 '''atan2''' 0<br> | ||
will correctly return the answer 90.<br> | will correctly return the answer 90.<br> | ||
[[atan]] 1/0 will return a Divide by Zero Error | [[atan]] 1/0 will return a Divide by Zero Error | ||
Revision as of 23:12, 21 May 2006
x atan2 y
Operand types:
x: Number
y: Number
Type of returned value:
Description:
Returns the arctangens of x/y.
Returned value is in degrees, in the range -180 to +180, using the signs of both parameters to determine the quadrant of the return value.
Positive angles are clockwise and negative angles are counter-clockwise.
Example:
_angle = 5 atan2 3 ..........Result is 59.0362
Notes:
atan2 is safer than the alternative atan.
This is because atan2 will correctly return the angle when the tangent is infinite:
1 atan2 0
will correctly return the answer 90.
atan 1/0 will return a Divide by Zero Error