August 2018
Intermediate to advanced
227 pages
4h 16m
Chinese
Content preview from 高效R语言编程
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高效编程
｜
61
• runif()
函数调用现在已经完全向量化。
•
我们通过
^
计算整个向量的幂。
• >
比较操作是向量化的。
• mean()
函数快于同等功能的
for
循环。
monte_carlo_vec() 函数比 monte_carlo() 函数快近
30
倍。
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۪฿!
ऍዐ
图
3
-
1
：Monte Carlo 积分例子。为了估算曲线下面积，向图形上抛掷随机点并计算位于曲
线下的点数
练习
1.
验证 monte_carlo_vec() 快于 monte_carlo()。试分析与随机投掷的飞镖
数关联多大。
与用户交互
当创建一个函数时，我们常常需要函数提供当前执行状况的有效反馈。例如
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.