matlab 基础入门 - ilovematlab
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1© 2017 The MathWorks, Inc.
MATLAB 基础入门
许悦伊
MathWorks 中国
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主要内容
▪ MATLAB 介绍
▪ MATLAB 矩阵运算
▪ MATLAB数据可视化
▪ MATLAB 函数和实时编辑器
▪ MATLAB 与深度学习
▪ MATLAB 学习工具与资源
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MATLAB 介绍
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MATLAB 是什么?
MATLAB®是一种用于算法开发、数据可视化、数据分析以及数值计算的科学计算语言和编程环境。全球数以百万计的工程师和科学家使用 MATLAB®来分析和设计可改变世界的系统和
产品。
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Kalman Filter
Predicted state and covariance
Estimation
Estimated state and covariance
Estimated measurements
1. MATLAB 精通数学
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2. MATLAB 为工程师和科学家设计
Files
Software
Hardware
Access
Code & Applications
Reporting and
Documentation
Outputs for Design
Deployment
Share
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3. MATLAB 工具箱得心应手
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4. MATLAB 具有交互式应用
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5. MATLAB 集成工作流程
VHDL/Verilog
C, C++
PLC
1,000+ 款硬件器件
自动代码生成
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6. MATLAB 迅速高效
快速3D 数据并行计算
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7. MATLAB 备受信任
每天100- 200 万次测试
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为什么是 MATLAB?
MATLAB
是工程师和科学家最易用、并且最高效的开发平台
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最新版本:MATLAB 2018a
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MATLAB
矩阵运算
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MATLAB 客户端界面
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MATLAB 中的数据结构
Array(数组):
包含多个值的变量(任意长度,任意维度)
Matrix(矩阵):
数值型 2-D array (m-by-n)
Vector(向量):
1-D array (1-by-n or m-by-1)
Scalar(标量):
单个值
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MATLAB 中的数据类型
分类型 函数句柄型 逻辑型
数值型时间型
异构型和字符型
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手动创建数组
19 13 7 11 2 17 5 3
19
13
7
11
2
17
5
3
>> x = [19 13 7 11 2 17 5 3]
>> x = [19;13;7;11;2;17;5;3]
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MATLAB 矩阵计算
▪ 矩阵化的数据访问
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*
m-by-n n-by-p m-by-p
MATLAB 矩阵计算
▪ 矩阵乘法
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▪ 矩阵点乘法
MATLAB 矩阵计算
▪ 类似情况:^ 与 .^, / 与 ./。
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▪ 向量化操作的内置函数
MATLAB 矩阵计算
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示例演示
▪ 矩阵与数组– MATLAB 帮助文档 > MATLAB 入门> 矩阵和数组
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MATLAB 矩阵运算
▪ >> x=A\b;
▪ 可用来求解线性方程组Ax=b
𝑎11 𝑎12 … 𝑎1𝑛𝑎21 𝑎22 … 𝑎2𝑛⋮ ⋮ ⋱ ⋮𝑎𝑛1 𝑎𝑛2 … 𝑎𝑛𝑛
𝑥1𝑥2⋮𝑥𝑛
=
𝑏1𝑏2⋮𝑏𝑛
▪ 示例:A=[1 2 1;2 -1 3;3 1 2];
b=[7;7;18];
x=A\b;
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MATLAB 命令行
检索重用
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MATLAB 文本编辑器
脚本编辑
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MATLAB 编程
▪ 判断分支
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MATLAB 编程
▪ 循环
for-loops 遍历
while-
loops条件判断
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MATLAB
数据可视化
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矩阵可视化
surf(z)
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数据绘图
✓ Automatic code
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Plot 绘图工具
Axis labels -2Units -1
4/10
更改属性
选择绘制组件添加绘制元素
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示例演示
▪ 2D 和 3D 绘图– MATLAB 帮助文档 > MATLAB入门> 二维图和三维图
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MATLAB
函数和实时编辑器
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为什么要用函数?
script1.m script2.mWorkspace
管理代码管理变量
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MATLAB 函数
42
0.7623
foo.m
BlackBox™
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示例演示
▪ 脚本 vs. 函数– MATLAB 帮助文档 > 脚本和函数的编程> 编程基础知识> 脚本与函数
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实时编辑器
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示例演示
▪ 实时脚本– MATLAB 帮助文档 > 脚本和函数的编程> 编程基础知识> 脚本与函数> 在实时编辑器中创建实时脚本
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MATLAB
与深度学习
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什么是深度学习?
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深度学习是机器学习的一种,在这种机器学习中,模型学习直接从图像、文本或声音中执行分类任务。
深度学习通常是使用神经网络架构实现的。
“深度”一词指的是网络中层次的数量——层次越多,网络越深。
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为什么要进行深度学习?
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深度学习的多样化应用
虹膜识别 —— 99.4% 准确率1
1. Source: An experimental study of deep convolutional features for iris recognition Signal Processing in Medicine and Biology Symposium (SPMB), 2016 IEEE
Shervin Minaee ; Amirali Abdolrashidiy ; Yao Wang; An experimental study of deep convolutional features for iris recognition
2. "A Real-Time Pedestrian Detector using Deep Learning for Human-Aware Navigation" David Ribeiro, Andre Mateus, Jacinto C. Nascimento, and Pedro Miraldo
3. Deep Joint Rain Detection and Removal from a Single Image" Wenhan Yang, Robby T. Tan, Jiashi Feng, Jiaying Liu, Zongming Guo, and Shuicheng Yan
机器人的人类感知导航2
雨的检测与移除3
MatConvnet
MatCaffe
MatConvnet
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为什么深度学习这么火?
Source: ILSVRC Top-5 Error on ImageNet
Human
Accuracy
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深度学习的推进者
• 海量标签数据
• GPUs 加速性能
• 可获得专家训练出的顶级深度模型
AlexNetPRETRAINED MODEL
CaffeM O D E L S
ResNet PRETRAINED MODEL
TensorFlow/Keras M O D E L S
VGG-16PRETRAINED MODEL
GoogLeNet PRETRAINED MODEL
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传统机器学习和深度学习的区别
深度学习通过从图像、文本和声音中直接学习特性、表示和任务来完成端到端的学习
Machine Learning
Deep Learning
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示例: 使用深度学习的对象识别
训练(GPU)
1000种不同分类的图片
预测 用电脑自带摄像头实施目标识别
https://cn.mathworks.com/matlabcentral/fileexchange/60659-deep-learning-in-11-lines-
of-matlab-code
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MATLAB
学习工具与资源
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玩转帮助文档
help
doc
docsearch
search
browse
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MATLAB 产品主页
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视频与网上研讨会
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答疑解惑:用户社区