4.21 atan2 - Angle of coordinates

Format: atan2( $num_1,num_2$ )

Return the angle in radians formed by the axis and line segment of $x,y$ coordinates $(num_1,num_2)$ and origin.

Example

Example 1: Basic Example

$ more dat1.csv
id,x,y
1,5,10
2,10,20
3,-1,0
4,0,0
5,,
$ mcal c='atan2(${x},${y})' a=rsl i=dat1.csv o=rsl1.csv
#END# kgcal a=rsl c=atan2(${x},${y}) i=dat1.csv o=rsl1.csv
$ more rsl1.csv
id,x,y,rsl
1,5,10,1.107148718
2,10,20,1.107148718
3,-1,0,3.141592654
4,0,0,0
5,,,