ある条件をもとに行列内の値を変更する。
A = np.array([[1,2,3,4],[-1,2,-9,10],[7,6,10,-8]])
print(A)
# [[ 1 2 3 4]
# [-1 2 -9 10]
# [ 7 6 10 -8]]
# 行列の要素が０以下の場合０にする
A[A <= 0] = 0
print(A)
# [[ 1 2 3 4]
# [ 0 2 0 10]
# [ 7 6 10 0]]
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