在Pharo拥有的所有功能中,metpy.calc.vorticity(u, v, dx, dy)[source]
Calculate the vertical vorticity of the horizontal wind.
Parameters:
u ((M, N) ndarray) – x component of the wind
v ((M, N) ndarray) – y component of the wind
dx (float or ndarray) – The grid spacing(s) in the x-direction. If an array, there should be one item less than the size of u along the applicable axis.
dy (float or ndarray) – The grid spacing(s) in the y-direction. If an array, there should be one item less than the size of u along the applicable axis.
dim_order (str or None, optional) – The ordering of dimensions in passed in arrays. Can be one of None, 'xy', or 'yx'. 'xy' indicates that the dimension corresponding to x is the leading dimension, followed by y. 'yx' indicates that x is the last dimension, preceded by y. None indicates that the default ordering should be assumed, which is ‘yx’. Can only be passed as a keyword argument, i.e. func(…, dim_order=’xy’).
Returns:
(M, N) ndarray – vertical vorticity
声明临时变量的风格确实感觉像应该保留在80年代。声明未初始化的变量然后对它们进行赋值而不是让let绑定有什么好处?
的确,IDE将有助于做出这样的声明,但是我发现删除赋值时很烦人,因为空声明仍会保留在其中。
答案 0 :(得分:4)
我不知道最初的原因,但是每周使用Smalltalk,我看到很多好处。
我想它也简化了编译器的实现。