- What is the difference between atan and atan2 in C++?
C++ atan2(y, x) will give us the value of angle α in radians atan is used if we only know or are interested in y x not y and x individually So if p = y x then to get α we'd use atan(p) You cannot use atan2 to determine the quadrant, you can use atan2 only if you already know which quadrant your in! In particular positive x and y imply the
- atan2(x,y) 如何理解？ - 知乎
atan2(a,b)详细解释： 语法 P = atan2(Y,X) 说明 示例 P = atan2(Y,X) 返回 Y 和 X 的四象限反正切 (tan-1)，该值必须为实数。atan2 函数遵循当 x 在数学上为零（或者为 0 或 -0）时 atan2(x,x) 返回 0 的约定。 示例 计算点的四象限反正切 尝试此示例Copy Command Copy Code
- Using atan2 to find angle between two vectors - Stack Overflow
atan2(vector y, vector x) = the angle between the vector and the X axis But I wanted to know how to get the angle between two vectors using atan2 So I came across this solution: atan2(vector1 y - vector2 y, vector1 x - vector2 x) My question is very simple: Will the two following formulas produce the same number?
- atan2(x,y) 如何理解？ - 知乎
atan2(a,b)详细解释： 语法 P = atan2(Y,X) 说明 示例 P = atan2(Y,X) 返回 Y 和 X 的四象限反正切 (tan-1)，该值必须为实数。atan2 函数遵循当 x 在数学上为零（或者为 0 或 -0）时 atan2(x,x) 返回 0 的约定。 示例 计算点的四象限反正切 尝试此示例Copy Command Copy Code
- 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
- What is the difference between numpy. atan and numpy. arctan?
In the numpy "_init_ pyi" there's some shortcuts, so atan and atan2 are identical to arctan and arctan2, respectively abs = absolute acos = arccos acosh = arccosh asin = arcsin asinh = arcsinh atan = arctan atanh = arctanh atan2 = arctan2 concat = concatenate bitwise_left_shift = left_shift bitwise_invert = invert bitwise_right_shift = right
- what will be atan2 output for both x and y as 0 - Stack Overflow
atan2(±0, −0) returns ±π atan2(±0, +0) returns ±0 A note on π π being an irrational number and all finite double are rational, a return value of machine pi (the closest representable double to π) is expected with atan2(+0, -0)
- Direct way of computing the clockwise angle between two vectors
For the two-dimensional case, atan2 can easily calculate the angle between a (1, 0) vector (the x-axis) and one of your vectors The formula is: Atan2(y, x) So you can easily calculate the difference of the two angles relative to the x-axis: angle = -(atan2(y2, x2) - atan2(y1, x1)) Why is it not used as default solution? atan2 is not efficient
|