- What is the difference between atan and atan2 in C++?
atan2 is intended for the origin to be in the middle, and things can go backwards or down That's what you'd use in a screen representation, because it DOES matter what direction you want the curve to go So atan2 can give you negative numbers, because its zero is in the center, and its result is something you can use to trace things in 4
- atan2 (x,y) 如何理解？ - 知乎
atan2 (y, x) 则根据 y 和 x 的正负确定点在哪个象限，从而给出正确的角度。 应用场景： 计算两点间连线的倾斜角，通过计算两点相对原点的偏移（即终点坐标减去起点坐标），然后使用 atan2 计算角度。
- Python atan or atan2, what should I use? - Stack Overflow
The point of atan2 () is that the signs of both inputs are known to it, so it can compute the correct quadrant for the angle For example, atan (1) and atan2 (1, 1) are both pi 4, but atan2 (-1, -1) is -3*pi 4 So it's pretty clear: the outputs are different because of the signs of ImZ and ImR atan2 returns the appropriate quadrant, unlike atan
- Using atan2 to find angle between two vectors - Stack Overflow
This Stack Overflow post explains how to use atan2 to calculate the angle between two vectors in programming
- math - How to map atan2 () to degrees 0-360 - Stack Overflow
atan2(y, x) has that discontinuity at 180° where it switches to -180° 0° going clockwise How do I map the range of values to 0° 360°? here is my code: CGSize deltaPoint = CGSizeMake(endPoint x -
- what will be atan2 output for both x and y as 0 - Stack Overflow
Shorter version "what will be atan2 output for both x and y as 0" Zero "how its output can be 0, even wikipedia says that it should be undefined" Wikipedia does not define C nor various math library specifications - it is a reference - not a specification "why compiler gives 0" That is the specified response from the floating point standard IEC-60559 IEEE 754 often used by various C
- Direct way of computing the clockwise angle between two vectors
2D case Just like the dot product is proportional to the cosine of the angle, the determinant is proportional to its sine So you can compute the angle like this: dot = x1*x2 + y1*y2 # Dot product between [x1, y1] and [x2, y2] det = x1*y2 - y1*x2 # Determinant angle = atan2(det, dot) # atan2(y, x) or atan2(sin, cos) The orientation of this angle matches that of the coordinate system In a left
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