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幅角主值argz与arctan (y x)有什么关系呢? - 知乎 \arg z\in [0,2\pi) , arctan y x ∈ ( − π 2, π 2) \arctan\dfrac y x\in (-\dfrac\pi2,\dfrac\pi2) 从区间来看这哥俩不一样,具体分情况如下 z 在第一象限或 x 轴正半轴,二者相等 z z 在 y y 轴正半轴, arg z = π 2, arctan y x \arg z=\dfrac\pi2, \arctan\dfrac y x 不存在, z z 在第二象限或
c++ - What does int argc, char *argv [] mean? - Stack Overflow The variables are named argc (argument count) and argv (argument vector) by convention, but they can be given any valid identifier: int main(int num_args, char** arg_strings) is equally valid
Default arguments with *args and **kwargs - Stack Overflow In Python 2 x (I use 2 7), which is the proper way to use default arguments with *args and **kwargs? I've found a question on SO related to this topic, but that is for Python 3: Calling a Python fu