perl function atan2

In Perl, the atan2 function is used to calculate the arctangent of a given pair of coordinates. It takes two arguments: the first is the y-coordinate, and the second is the x-coordinate. The result is the angle in radians between the positive x-axis and the line connecting the origin to the given point.

Here's an example that demonstrates the use of the atan2 function:

use strict;
use warnings;

my $x = 3;
my $y = 4;

my $angle = atan2($y, $x);

print "The angle between the positive x-axis and the line connecting the origin to ($x, $y) is $angle radians.\n";

In the above example, we have a point with coordinates (3, 4). We pass these coordinates to the atan2 function, which returns the angle in radians between the positive x-axis and the line connecting the origin to the given point. We then print out the result.

Note that the atan2 function can also return the angle in degrees instead of radians by multiplying the result by 180 / pi. For example:

use strict;
use warnings;

my $x = 3;
my $y = 4;

my $angle = atan2($y, $x) * 180 / atan2(0, -1);

print "The angle between the positive x-axis and the line connecting the origin to ($x, $y) is $angle degrees.\n";

In the above example, we multiply the result of the atan2 function by 180 / pi to convert it from radians to degrees. We use the atan2(0, -1) function call to get the value of pi. We then print out the result in degrees.