function
Library: Trigonometry (OMTRIG legacy)
Include: omtrig.xin |
Returns: Rectangular co-ordinates. |
define external float function atan2 (value float x, value float y)
Use atan2
with two rectangular co-ordinates, x and y, as arguments to calculate the arc tangent (y/x). atan2
gives you the degree in radians. This trigonometric function works in conjunction with hypot
.
In mathematics, the arc tangent is also called the inverse tangent.
Out-of-range values, such as acos() and asin() for |x| > 1, return "not a number" (NaN).
Example:
include "omtrig.xin" process local float x initial {1.1} local float y initial {0.7} local float atan2-value set atan2-value to atan2 (x, y) output "Take the rectangular co-ordinates x ( = " || "d" % x || " ) and y ( = " || "d" % y || " ) %n" || "Their arc tangent = " || "d" % atan2-value || "%n" ; Output: "Take the rectangular co-ordinates x ( = 1.1 ) and y ( = 0.7 )" ; "Their arc tangent = 1.00406710927139"