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python中已经有不少默认的向量化操作的函数如：±×/之类

那么如何自定义向量化操作函数呢？

import numpy as npimport pandas as pd X = pd.DataFrame([[1,2], [3,4]])Y = pd.DataFrame([[2,1], [3,3]]) def f(x, y):                      # this is a demo function that takes in two ints and    return str(x) + str(y)        # concatenate them as str vecF = np.vectorize(f)            # vectorize the function with numpy.vectorize X#   0   1#0  1   2#1  3   4 Y#   0   1#0  2   1#1  3   3 pd.DataFrame(vecF(X, Y))          # apply the function to two data frames #    0   1#0  12  21#1  33  43

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