25. +演算子の違い
Z = np.zeros((5,5))
Z += np.arange(5)
(zeros(Int64,5,5) .+ [0:4])'
[y for x in 1:5, y in 0:4]
行列の要素の加算は`.+`を使う
26. Packageを必要とする例
Z = np.ones(10)
I = np.random.randint(0,len(Z),20)
Z += np.bincount(I, minlength=len(Z))
using StatsBase
Z = ones(10)
I = rand(0:length(Z), 20)
Z += counts(I, 1:length(Z))