angle

How would you calculate the degrees between two points on the edge of a circle in Swift. Given points p1 , p2 on a circle with center center , you would compute the difference vectors first: let v1 = CGVector(dx: p1.x - center.x, dy: p1.y - center.y) let v2 = CGVector(dx: p2.x - center.x, dy: p2.y - center.y) Then let angle = atan2(v2.dy, v2.dx) - atan2(v1.dy, v1.dx) is the (directed) angle between those vectors in radians, and var deg = angle * CGFloat(180.0 / M_PI) the angle in degrees. The computed value can be in the range -360 .. 360, so you might want to normalize it to the range 0 <=

This might have been answered before, sorry if it has. I basically need to get the angle from origin to point. So lets say Origin is (0, 0) and my target point is (3, 0) . 3 O'clock = 90 degrees 6 O'clock = 180 degrees 9 O'clock = 270 degrees 12 O'clock = 0 degrees Somehow, I gotta do some math magic, and find out that the angle is 90 degrees (Top is 0). The origin can vary, so I need a method with two parameters, Origin, and TargetPoint, which returns double Angle in Degrees. Yea, I realize this looks short and nonconstructive, but I made the question as simple and understandable as possible.

I have two 3D vectors called A and B that both only have a 3D position. I know how to find the angle along the unit circle ranging from 0-360 degrees with the atan2 function by doing: EDIT: (my atan2 function made no sense, now it should find the "y-angle" between 2 vectors): toDegrees(atan2(A.x-B.x,A.z-B.z))+180 But that gives me the Y angle between the 2 vectors. I need to find the X angle between them. It has to do with using the x, y and z position values. Not the x and z only, because that gives the Y angle between the two vectors. I need the X angle, I know it sounds vague but I don't

I have U and V wind component data and I would like to calculate wind direction from these values in R. I would like to end up with wind direction data on a scale of 0-360 degrees, with 0° or 360° indicating a wind blowing to the north, 90° indicating a wind blowing to the east, 180° indicating a wind blowing to the south and 270° indicating a wind blowing to the west. Below is some example data: > dput(wind) structure(list(u_ms = c(-3.711, -2.2417, -1.8188, -1.6164, -1.3941, -1.0682, -0.57611, -1.5698, -1.4976, -1.3537, -1.0901, -0.60403, -0.70812, -0.49045, -0.39849, 0.17875, 0.48356, 1.5082

I have been not using math for a long time and this should be a simple problem to solve. Suppose I have two points A: (1, 0) and B: (1, -1). I want to use a program (Python or whatever programming language) to calculate the clockwise angle between A, origin (0, 0) and B. It will be something like this: angle_clockwise(point1, point2) Note that the order of the parameters matters. Since the angle calculation will be clockwise: If I call angle_clockwise(A, B), it returns 45. If I call angle_clockwise(B, A), it returns 315. In other words, the algorithm is like this: Draw a line (line 1) between