<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[TrueEik的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/TrueEik</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; TrueEik]]></copyright><item><title><![CDATA[Cmake找不到mysql.h和libmysqlclient.so]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/135014921</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/135014921</guid><author>TrueEik</author><pubDate>Fri, 15 Dec 2023 13:43:13 +0800</pubDate><description><![CDATA[查看mysql.h和libmysqlclient.so的路径。添加到CMakeLists.txt中。]]></description><category></category></item><item><title><![CDATA[结构体数组作结构体成员]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/134535632</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/134535632</guid><author>TrueEik</author><pubDate>Tue, 21 Nov 2023 16:43:42 +0800</pubDate><description><![CDATA[【代码】结构体数组作结构体成员。]]></description><category></category></item><item><title><![CDATA[选择排序。]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/134016958</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/134016958</guid><author>TrueEik</author><pubDate>Tue, 24 Oct 2023 17:11:06 +0800</pubDate><description><![CDATA[【代码】选择排序。]]></description><category></category></item><item><title><![CDATA[二级指针读文件]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/134005887</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/134005887</guid><author>TrueEik</author><pubDate>Tue, 24 Oct 2023 10:15:00 +0800</pubDate><description><![CDATA[【代码】二级指针读文件。]]></description><category></category></item><item><title><![CDATA[剑指Offer 05.替换空格]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/133798434</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/133798434</guid><author>TrueEik</author><pubDate>Thu, 12 Oct 2023 20:27:52 +0800</pubDate><description><![CDATA[请实现一个函数，把字符串 s 中的每个空格替换成"%20"。1、暴力——每检测到一个空格，空格后的数据元素整体后移两位。输入：s = “We are happy.”输出：“We%20are%20happy.”]]></description><category></category></item><item><title><![CDATA[C++初学题]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/133669333</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/133669333</guid><author>TrueEik</author><pubDate>Sun, 08 Oct 2023 21:20:04 +0800</pubDate><description><![CDATA[2、给定一个数组{ 7, 1, 3, 5, 1, 6, 8, 1, 3, 5, 7, 5, 6 }，求任意给出范围内元素的和，如1~2，求和为1+3=4。1、输入一个数n，求1到n的各阶乘之和。打印一个整数的32位二进制形式。]]></description><category></category></item><item><title><![CDATA[生成随机数]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/133687473</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/133687473</guid><author>TrueEik</author><pubDate>Sun, 08 Oct 2023 21:19:29 +0800</pubDate><description><![CDATA[（二进制ff：等于00和11则重新判断，等于01返回0，等于10返回1，因为01和10概率相等都是p*（1-p））给定一个函数f可以以固定概率p返回0，以1-p的概率返回1，如何利用f等概率生成[1, 7]范围内的整数？2、f2可以等概率得到二进制0和1，通过移位运算得到所需的各位。给定一个函数f可以等概率生成[1, 5]范围内的整数，如何利用f等概率生成[1, 7]范围内的整数？思路：利用f改造一个等概率生成0和1的函数f2。1、利用f改造一个等概率生成0和1的函数f2。]]></description><category></category></item><item><title><![CDATA[对数器——自己生成随机样本做比对]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/133689948</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/133689948</guid><author>TrueEik</author><pubDate>Sun, 08 Oct 2023 21:18:53 +0800</pubDate><description><![CDATA[自己生成随机样本做比对验证排序等算法是否正确。]]></description><category></category></item><item><title><![CDATA[类模板+友元，全局函数类内类外实现]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/133514110</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/133514110</guid><author>TrueEik</author><pubDate>Tue, 03 Oct 2023 11:19:07 +0800</pubDate><description><![CDATA[类模板+友元，全局函数类内实现。类模板+友元，全局函数类外实现。]]></description><category></category></item><item><title><![CDATA[C++：排序]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/133278441</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/133278441</guid><author>TrueEik</author><pubDate>Mon, 25 Sep 2023 18:40:40 +0800</pubDate><description><![CDATA[【代码】C++：排序。]]></description><category></category></item><item><title><![CDATA[学Slidev时遇到的小问题]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/124133645</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/124133645</guid><author>TrueEik</author><pubDate>Tue, 12 Apr 2022 20:43:22 +0800</pubDate><description><![CDATA[在使用npm初始化一个slidev仓库时报错如上，用管理员权限打开cmd运行即可。
Step1 win+R
Step2 输入cmd
Step3 Ctrl+Shift+Enter 点击是

]]></description><category></category></item><item><title><![CDATA[return和exit区别：]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/108960902</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/108960902</guid><author>TrueEik</author><pubDate>Thu, 08 Oct 2020 11:10:19 +0800</pubDate><description><![CDATA[int fun(int x){
    if(x==0)
        return 0;
    else
        return 1;
}

int main(){
    int i=100;
    if(fun(i) &gt; 0)
        printf("返回大于0的值\n");

    return 0; //这个0，告诉操作系统，程序运行成功
}


return和exit有区别：
1，exit用于在程序运行的过程中随时结束程序，exit的参数是返回给OS的。main函数.]]></description><category></category></item><item><title><![CDATA[MATLAB学习]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/105691655</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/105691655</guid><author>TrueEik</author><pubDate>Wed, 22 Apr 2020 20:29:02 +0800</pubDate><description><![CDATA[1、如果不将计算结果保存到指定变量中，则默认保存到ans中：如：x=3，y=5，x*y
2、如果不想显示结果，则命令后加分号（；），如：z=x*y；
3、用size命令可了解矩阵的大小，用length命令可了解向量的大小
4、

clear命令可清除工作环境中的全部变量和函数，以释放相应的内存空间；
从内存中清除指定的变量：clear x
如果工作环境中已有一向量x，如果经过计算后得到的新向量x比...]]></description><category></category></item><item><title><![CDATA[C++笔记]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/101685471</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/101685471</guid><author>TrueEik</author><pubDate>Sun, 29 Sep 2019 13:16:40 +0800</pubDate><description><![CDATA[菜鸡笔记，不喜勿喷

1、using namespace std; ------后面的分号不能丢
2、强制类型转换如(int)a,而不是int(a)
3、取整数部分用(int)3.14
4、if (a&gt;b)后边不加冒号，条件要用括号括起来，当if语句块不只一条时要用{}括起来。
5、C++不必考虑缩进

...]]></description><category></category></item><item><title><![CDATA[二、描述性统计分析与绘图]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/94758638</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/94758638</guid><author>TrueEik</author><pubDate>Fri, 05 Jul 2019 20:03:27 +0800</pubDate><description><![CDATA[一、变量类型
1、分类变量：不同值的数量有限，分名义变量和等级变量
2、连续变量：在规定范围区间内可以取任意值，如收入只要不低于0可以出现任何数字
二、连续变量分布与集中趋势
1、平均数：反映数据集中水平
#求prince的均值
snd.price.agg(['mean', 'median', 'std'])

2、中位数：使用了数据的次序信息而非取值
#求price的四分位数
data.pric...]]></description><category></category></item><item><title><![CDATA[三、数据整合]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/94729214</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/94729214</guid><author>TrueEik</author><pubDate>Fri, 05 Jul 2019 12:57:42 +0800</pubDate><description><![CDATA[#coding:utf-8
import numpy as np
import pandas as pd

#行列操作
sample = pd.DataFrame(np.random.randn(4,5), \
  columns=['a','b','c','d','e'])#生成四行五列的正态随机分布数#定义相应列名


sample.ix[0:2, ['a']]#0-2行a列的一个序列
sam...]]></description><category></category></item><item><title><![CDATA[一、数据挖掘技术与方法]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/94196348</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/94196348</guid><author>TrueEik</author><pubDate>Sat, 29 Jun 2019 19:41:01 +0800</pubDate><description><![CDATA[本文内容是对《Python数据科学技术详解与商业实战》的个人理解

一、数据挖掘方法
1、描述性数据挖掘（模式识别）

数据建模一般有多个属性或变量
属性用于描述各个观测者的特征
可以发现彼此间的关联

具体算法：
1】、聚类分析
把客户分类，使用多个变量进行细分。
2】、关联规则分析
捆绑销售和推荐类似商品
2、预测性数据分析

有明确的预测变量和相应的因变量

具体算法：
1】、决策树
按图...]]></description><category></category></item><item><title><![CDATA[#9、mat基础2]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/93381951</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/93381951</guid><author>TrueEik</author><pubDate>Fri, 28 Jun 2019 13:54:39 +0800</pubDate><description><![CDATA[import matplotlib.pyplot as plt
import numpy as np
from mpl_toolkits.mplot3d import Axes3D

x = np.linspace(-3,3,50)  #从-3到3的范围有50个点
y1 = 2*x+1
y2 = x**2
#11、将图画在不同的窗口里
plt.figure('一')
plt.plot(x,y1,c...]]></description><category></category></item><item><title><![CDATA[#8、mat基础]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/93381675</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/93381675</guid><author>TrueEik</author><pubDate>Sun, 23 Jun 2019 15:23:39 +0800</pubDate><description><![CDATA[#1、绘制折线图、散点图  plot/直方图hist
import matplotlib.pylab as pyl
import numpy as np
import matplotlib.gridspec as gridspec
x=[1,2,3,4,5]   #存储x轴数据
y=[]            #注意x、y的数据个数要一致
pyl.plot(x轴数据,y轴数据,'展现形式：颜色之类...]]></description><category></category></item><item><title><![CDATA[#7、多线程爬虫]]></title><link>https://blog.youkuaiyun.com/TrueEik/article/details/93381614</link><guid>https://blog.youkuaiyun.com/TrueEik/article/details/93381614</guid><author>TrueEik</author><pubDate>Sun, 23 Jun 2019 15:22:43 +0800</pubDate><description><![CDATA[#普通段子爬虫
import urllib.request
import re
import urllib.error
headers=("User- Agent","Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.25 Safari/537.36 Core/1.70.3641...]]></description><category></category></item></channel></rss>