矢量化加法

Vectorizing addition

假设我有两个 numpy 数组 a[n,3]b[m,3]

如何计算 c[n,m,3] ,而不求助于 for 循环,例如:

c[i,j,:] = a[i,:] + b[j,:]

试试这个:

c = a[:, None, :] + b[None, :, :]