python计算一定期间的涨幅 黄金历史单日最高涨幅排名是多少

1 逻辑运算

# 重新生成8只股票10个交易日的涨跌幅数据

>>> stock_change = np.random.normal(0, 1, (8, 10))

>>> stock_change = stock_change[0:5, 0:5]

# 逻辑判断, 如果涨跌幅大于0.5就标记为True 否则为False

>>> stock_change > 0.5

array([[ True, False, False, True, False],

[ True, True, False, False, False],

[ True, False, True, False, True],

[False, True, False, False, False],

[False, False, False, True, True]])

# BOOL赋值, 将满足条件的设置为指定的值-布尔索引

>>> stock_change[stock_change > 0.5] = 1

array([[ 1. , -0.72404879, -1.33045773, 1. , 0.3869043 ],

[ 1. , 1. , 0.20815446, -1.67860823, 0.06612823],

[ 1. , 0.42753488, 1. , -0.24375089, 1. ],

[-0.971945 , 1. , -0.95444661, -0.2602084 , -0.48736497],

[-0.32183056, -0.92544956, -0.42126604, 1. , 1. ]])

2 通用判断函数np.all()

# 判断stock_change[0:2, 0: