Difference between revisions of "Documentation/How Tos/Calc: ATAN2 function"
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: <tt>'''ATAN2'''</tt> returns the inverse trigonometric tangent, that is, the angle (in radians) between the x-axis and a line from point <tt>'''x_coord'''</tt>, <tt>'''y_coord'''</tt> to the origin. The angle returned is between <tt>'''-PI'''</tt> and <tt>'''PI'''</tt>. | : <tt>'''ATAN2'''</tt> returns the inverse trigonometric tangent, that is, the angle (in radians) between the x-axis and a line from point <tt>'''x_coord'''</tt>, <tt>'''y_coord'''</tt> to the origin. The angle returned is between <tt>'''-PI'''</tt> and <tt>'''PI'''</tt>. | ||
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: To return the angle in degrees, use the <tt>'''DEGREES'''</tt> function. | : To return the angle in degrees, use the <tt>'''DEGREES'''</tt> function. | ||
Revision as of 06:40, 2 March 2008
ATAN2
Returns the inverse tangent (the arctangent) for specified x and y coordinates.
Syntax:
ATAN2(x_coord; y_coord)
- x_coord is the value of the x coordinate.
- y_coord is the value of the y coordinate.
- ATAN2 returns the inverse trigonometric tangent, that is, the angle (in radians) between the x-axis and a line from point x_coord, y_coord to the origin. The angle returned is between -PI and PI.
- To return the angle in degrees, use the DEGREES function.
Example:
ATAN2(20; 20)
- returns 0.785398163397448 (PI/4 radians).
DEGREES(ATAN2(12.3; 12.3))
- returns 45. The tangent of 45 degrees is 1.
