node-2016-08-04

本文介绍了编程中的栈特性及其应用,并对比了不同编程语言的发展历程,从C到Java再到现代函数式编程的趋势,同时探讨了指令式编程与函数式编程的区别。

栈是什么,堆栈的栈

栈的特点:先进后出,后进先出

前端+后端(lamp/lnmp)+APP (原生APP:ios、android},混合App、WebApp)

C -> C++ -> java -> PHP

C、C++指针手动的,内存管理,在计算机运行编译成机器码
java内存管理把C++打败,java一处编译,到处执行

高级语言一段时间就会有大的变化

函数式编程 目前最流行的 动态类型
java8有70%-80%是函数式编程 google的Go语言有一部分是函数式编程

指令式编程(程序逻辑思想)

控制指令
内存分配
执行逻辑

函数式编程(人类的编程思想,让电脑像人一样思考)

不需要预留接口
动态类型语言+强类型
把影响性能的东西封装

强类型语言 弱类型语言 动态类型 静态类型

123 ‘123’ 需要类型转换就是强类型,在底层上能区分变量类型
动态语言 声明变量不指定类型,如:PHP、JS 强类型一定是静态类型

[root@localhost ~]# cd Downloads/ [root@localhost Downloads]# yum install java-1.8.0-openjdk-devel Loaded plugins: fastestmirror, langpacks Loading mirror speeds from cached hostfile * base: mirrors.aliyun.com * epel: ftp-stud.hs-esslingen.de * extras: mirrors.aliyun.com * updates: mirrors.aliyun.com Resolving Dependencies --> Running transaction check ---> Package java-1.8.0-openjdk-devel.x86_64 1:1.8.0.412.b08-1.el7_9 will be installed --> Processing Dependency: java-1.8.0-openjdk(x86-64) = 1:1.8.0.412.b08-1.el7_9 for package: 1:java-1.8.0-openjdk-devel-1.8.0.412.b08-1.el7_9.x86_64 --> Running transaction check ---> Package java-1.8.0-openjdk.x86_64 1:1.8.0.332.b09-1.el7_9 will be updated ---> Package java-1.8.0-openjdk.x86_64 1:1.8.0.412.b08-1.el7_9 will be an update --> Processing Dependency: java-1.8.0-openjdk-headless(x86-64) = 1:1.8.0.412.b08-1.el7_9 for package: 1:java-1.8.0-openjdk-1.8.0.412.b08-1.el7_9.x86_64 --> Running transaction check ---> Package java-1.8.0-openjdk-headless.x86_64 1:1.8.0.332.b09-1.el7_9 will be updated ---> Package java-1.8.0-openjdk-headless.x86_64 1:1.8.0.412.b08-1.el7_9 will be an update --> Processing Dependency: tzdata-java >= 2023d for package: 1:java-1.8.0-openjdk-headless-1.8.0.412.b08-1.el7_9.x86_64 --> Running transaction check ---> Package tzdata-java.noarch 0:2022a-1.el7 will be updated ---> Package tzdata-java.noarch 0:2024a-1.el7 will be an update --> Finished Dependency Resolution /var/cache/yum/x86_64/7/base/gen/comps.xml: no element found: line 1, column 0 Dependencies Resolved ================================================================================ Package Arch Version Repository Size ================================================================================ Installing: java-1.8.0-openjdk-devel x86_64 1:1.8.0.412.b08-1.el7_9 updates 9.9 M Updating for dependencies: java-1.8.0-openjdk x86_64 1:1.8.0.412.b08-1.el7_9 updates 325 k java-1.8.0-openjdk-headless x86_64 1:1.8.0.412.b08-1.el7_9 updates 33 M tzdata-java noarch 2024a-1.el7 updates 187 k Transaction Summary ================================================================================ Install 1 Package Upgrade ( 3 Dependent packages) Total download size: 44 M Is this ok [y/d/N]: y Downloading packages: No Presto metadata available for updates (1/4): java-1.8.0-openjdk-1.8.0.412.b08-1.el7_9.x86_64.rpm | 325 kB 00:00 (2/4): java-1.8.0-openjdk-devel-1.8.0.412.b08-1.el7_9.x86_ | 9.9 MB 00:21 (3/4): tzdata-java-2024a-1.el7.noarch.rpm | 187 kB 00:00 (4/4): java-1.8.0-openjdk-headless-1.8.0.412.b08-1.el7_9.x | 33 MB 01:12 -------------------------------------------------------------------------------- Total 608 kB/s | 44 MB 01:13 Running transaction check Running transaction test Transaction test succeeded Running transaction Updating : tzdata-java-2024a-1.el7.noarch 1/7 Updating : 1:java-1.8.0-openjdk-headless-1.8.0.412.b08-1.el7_9.x86_64 2/7 warning: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.412.b08-1.el7_9.x86_64/jre/lib/security/java.policy created as /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.412.b08-1.el7_9.x86_64/jre/lib/security/java.policy.rpmnew warning: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.412.b08-1.el7_9.x86_64/jre/lib/security/java.security created as /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.412.b08-1.el7_9.x86_64/jre/lib/security/java.security.rpmnew restored /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.412.b08-1.el7_9.x86_64/jre/lib/security/java.policy.rpmnew to /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.412.b08-1.el7_9.x86_64/jre/lib/security/java.policy restored /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.412.b08-1.el7_9.x86_64/jre/lib/security/java.security.rpmnew to /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.412.b08-1.el7_9.x86_64/jre/lib/security/java.security Updating : 1:java-1.8.0-openjdk-1.8.0.412.b08-1.el7_9.x86_64 3/7 Installing : 1:java-1.8.0-openjdk-devel-1.8.0.412.b08-1.el7_9.x86_64 4/7 Cleanup : 1:java-1.8.0-openjdk-1.8.0.332.b09-1.el7_9.x86_64 5/7 Cleanup : 1:java-1.8.0-openjdk-headless-1.8.0.332.b09-1.el7_9.x86_64 6/7 Cleanup : tzdata-java-2022a-1.el7.noarch 7/7 Verifying : 1:java-1.8.0-openjdk-headless-1.8.0.412.b08-1.el7_9.x86_64 1/7 Verifying : tzdata-java-2024a-1.el7.noarch 2/7 Verifying : 1:java-1.8.0-openjdk-devel-1.8.0.412.b08-1.el7_9.x86_64 3/7 Verifying : 1:java-1.8.0-openjdk-1.8.0.412.b08-1.el7_9.x86_64 4/7 Verifying : tzdata-java-2022a-1.el7.noarch 5/7 Verifying : 1:java-1.8.0-openjdk-1.8.0.332.b09-1.el7_9.x86_64 6/7 Verifying : 1:java-1.8.0-openjdk-headless-1.8.0.332.b09-1.el7_9.x86_64 7/7 Installed: java-1.8.0-openjdk-devel.x86_64 1:1.8.0.412.b08-1.el7_9 Dependency Updated: java-1.8.0-openjdk.x86_64 1:1.8.0.412.b08-1.el7_9 java-1.8.0-openjdk-headless.x86_64 1:1.8.0.412.b08-1.el7_9 tzdata-java.noarch 0:2024a-1.el7 Complete! [root@localhost Downloads]# history 1 yum -y install gcc gcc-c++ openssl-devel 2 cd Downloads/ 3 wget https://nodejs.org/dist/v6.9.2/node-v6.9.2.tar.gz 4 ls 5 cd .. 6 ls 7 mkdir node 8 cd node 9 tar -xzf ~/Downloads/node-v6.9.2.tar.gz -C ./ 10 ls -l 11 cd .. 12 cd Downloads/ 13 cd node-v6.9.2.tar.gz 14 ls 15 cd node-v6.9.2.tar.gzcd .. 16 cd .. 17 cd node 18 ls 19 cd node-v6.9.2/ 20 ./configure 21 make -j$(nproc) 22 history 23 make install 24 node -v 25 npm -v 26 node --version 27 gcc --version 28 cd .. 29 mkdir -p /data/redis 30 cd /data/redis 31 wget https://download.redis.io/releases/redis-7.0.2.tar.gz 32 ls 33 tar -zxvf redis-7.0.2.tar.gz 34 ls -l 35 cd redis-7.0.2 36 make 37 sudo mkdir -p /etc/redis 38 sudo mkdir -p /var/lib/redis 39 ls -l 40 sudo cp redis.conf /etc/redis/ 41 cd .. 42 l -l 43 ls -l 44 cd .. 45 ls -l 46 cd .. 47 ls -l 48 cd etc/ 49 ls -l 50 cd redis 51 ls -l 52 vi redis.conf 53 redis-server /etc/redis/redis.conf 54 redis-server /redis.conf 55 cd .. 56 cd data 57 cd redis 58 sudo cp /data/redis/redis-7.0.2/src/redis-server /usr/bin/ 59 sudo cp /data/redis/redis-7.0.2/src/redis-cli /usr/bin/ 60 sudo cp /data/redis/redis-7.0.2/src/redis-benchmark /usr/bin/ 61 sudo cp /data/redis/redis-7.0.2/src/redis-check-aof /usr/bin/ 62 sudo cp /data/redis/redis-7.0.2/src/redis-check-rdb /usr/bin/ 63 sudo cp /data/redis/redis-7.0.2/src/redis-sentinel /usr/bin/ 64 cd /user/bin 65 cd .. 66 cd user 67 pwd 68 cd root 69 cd bin 70 ls 71 cd .. 72 ls 73 cd bin 74 ls -l 75 redis-server /etc/redis/redis.conf 76 cd .. 77 cd etc 78 ls -l 79 vi sysctl.conf 80 sysctl -p 81 cd .. 82 redis-server /etc/redis/redis.conf 83* redis-cil ping./ 84 cd bin 85* 86 ls l 87 ls -l 88 redis-server /etc/redis/redis.conf 89 cd .. 90 ls -l 91 cd root 92 cd Downloads/ 93 yum install java-1.8.0-openjdk-devel 94 history [root@localhost Downloads]# ls -l total 25904 -rw-r--r--. 1 root root 26522709 Dec 7 2016 node-v6.9.2.tar.gz [root@localhost Downloads]#
10-24
【轴承故障诊断】基于融合鱼鹰和柯西变异的麻雀优化算法OCSSA-VMD-CNN-BILSTM轴承诊断研究【西储大学数据】(Matlab代码实现)内容概要:本文提出了一种基于融合鱼鹰和柯西变异的麻雀优化算法(OCSSA)优化变分模态分解(VMD)参数,并结合卷积神经网络(CNN)与双向长短期记忆网络(BiLSTM)的轴承故障诊断模型。该方法利用西储大学公开的轴承数据集进行验证,通过OCSSA算法优化VMD的分解层数K和惩罚因子α,有效提升信号分解精度,抑制模态混叠;随后利用CNN提取故障特征的空间信息,BiLSTM捕捉时间序列的动态特征,最终实现高精度的轴承故障分类。整个诊断流程充分结合了信号预处理、智能优化与深度学习的优势,显著提升了复杂工况下轴承故障诊断的准确性与鲁棒性。; 适合人群:具备一定信号处理、机器学习及MATLAB编程基础的研究生、科研人员及从事工业设备故障诊断的工程技术人员。; 使用场景及目标:①应用于旋转机械设备的智能运维与故障预警系统;②为轴承等关键部件的早期故障识别提供高精度诊断方案;③推动智能优化算法与深度学习在工业信号处理领域的融合研究。; 阅读建议:建议读者结合MATLAB代码实现,深入理解OCSSA优化机制、VMD参数选择策略以及CNN-BiLSTM网络结构的设计逻辑,通过复现实验掌握完整诊断流程,并可进一步尝试迁移至其他设备的故障诊断任务中进行验证与优化。
评论
成就一亿技术人!
拼手气红包6.0元
还能输入1000个字符
 
红包 添加红包
表情包 插入表情
 条评论被折叠 查看
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