regular

本文介绍如何使用正则表达式来匹配特定格式的日期字符串,例如 to_date('26/07/200710:10:10','dd-mm-yyyyhh24:mi:ss') 这样的格式。

怎样利用镇则表达式匹配 to_date('26/07/2007 10:10:10', 'dd-mm-yyyy hh24:mi:ss')

Regular bins refer to a concept commonly used in data analysis and information technology, especially in the context of data binning. ### Definition In data binning, regular bins are intervals of equal width into which a continuous variable is divided. For example, if you have a set of data representing the ages of people ranging from 0 - 100, and you decide to create regular bins of width 10, you would have bins like [0 - 9], [10 - 19], [20 - 29], and so on. ### Applications in IT - **Data Visualization**: Regular bins are used to simplify the presentation of data. For instance, in a histogram, a graphical representation of the distribution of data, regular bins are used to group the data. This makes it easier to understand the overall distribution pattern of the data, such as whether it is symmetric, skewed, or has multiple peaks. ```python import matplotlib.pyplot as plt import numpy as np # Generate some sample data data = np.random.randn(1000) # Create regular bins bins = np.arange(-5, 5, 0.5) # Plot the histogram plt.hist(data, bins=bins) plt.show() ``` - **Machine Learning**: In machine learning, regular bins can be used for feature engineering. By converting a continuous feature into a categorical feature using regular bins, the model can sometimes better capture the relationships in the data. For example, in a decision tree algorithm, discretizing a continuous variable into regular bins can reduce the complexity of the model and improve its interpretability. - **Database Query Optimization**: When querying large databases, regular bins can be used to optimize range queries. By pre - partitioning the data into regular bins, the database can quickly eliminate large portions of the data that do not fall within the query range, reducing the amount of data that needs to be scanned.
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值