function:ATAN2

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 function:ATAN2 [2018/09/24 02:21]peternlewis Added clarity to argument order function:ATAN2 [2018/09/26 00:16] (current)peternlewis positive upwards Both sides previous revision Previous revision 2018/09/26 00:16 peternlewis positive upwards2018/09/24 02:21 peternlewis Added clarity to argument order2015/01/15 01:13 peternlewis created 2018/09/26 00:16 peternlewis positive upwards2018/09/24 02:21 peternlewis Added clarity to argument order2015/01/15 01:13 peternlewis created Line 1: Line 1: - The ATAN2(y,x) function returns the arctangent of its two arguments. ​ The purpose of using two arguments instead of one is to to return the appropriate quadrant of the resulting angle, which is not possible for the single argument [[ATAN]] function. ​ For arguments y,x, not both zero, this function returns the angle in radians between the x-axis and the point (x,​y). ​ Note that the arguments to ATAN2 are y,x, not the usual x,y order. + The ATAN2(y,x) function returns the arctangent of its two arguments. ​ The purpose of using two arguments instead of one is to to return the appropriate quadrant of the resulting angle, which is not possible for the single argument [[ATAN]] function. ​ For arguments y,x, not both zero, this function returns the angle in radians between the x-axis and the point (x,​y). ​ Note that the arguments to ATAN2 are y,x, not the usual x,y order. ​ Also note that y is in the mathematical direction, positive upwards, unlike screen coordinates which are usually positive downwards.