cost function: 1function [ jVal,gradient ] =costFunction3( theta )2%COSTFUNCTION3 Summary ofthisfunction goes here3%Logistic Regression45x=[-3; -2; -1;0;1;2;3];6y=[0.01;0.05;0.3;0.45;0.8;1.1;0.99];7m=size(x,1);89%hypothesis data10hypothesis =h_func(x,theta);1112%jVal-cost fun...
function J = computeCost(X, y, theta) %COMPUTECOST Compute cost for linear regression % J = COMPUTECOST(X, y, theta) computes the cost of using theta as the % parameter for linear regression to fit the data points in X and y % Initialize some useful values m = length(y); % numbe...
可以发现使用梯度下降和正规方程得到的最优参数 θ θ θ虽然有所不同,但是和预测1650平方英尺、3间卧室的房屋售价结果是相同的。 三、MATLAB实现 3.1 ex1.m %% Machine Learning Online Class - Exercise 1: Linear Regression % Instructions % --- % % This file contains code that helps you get started...
To begin fitting a regression, put your data into a form that fitting functions expect. All regression techniques begin with input data in an arrayXand response data in a separate vectory, or input data in a table or dataset arraytbland response data as a column intbl. Each row of the ...
linearregression三维画图拟合 三维线性拟合 matlab三维拟合(多元线性回归) 问题描述 今天同学问了我一个问题,大概意思是给了你三列输入数据,一列输出数据,想用一个线性超平面做一个最小二乘拟合(注意这里不能叫插值)。 一点思考 刚听到这个问题,同学说的是做插值,说想要做一个插值,这种说法不准确的,不想说回归的...
MATLAB Workshop 15 - Linear Regression in MATLAB 线性回归分析
In MATLAB, you can findBusing themldivideoperator asB = X\Y. From the datasetaccidents, load accident data inyand state population data inx. Find the linear regression relationy=β1xbetween the accidents in a state and the population of a state using the\operator. The\operator performs a ...
matlab linear-regression Share Improve this question Follow asked Feb 16, 2012 at 17:06 CaptainProg 5,6502323 gold badges7373 silver badges117117 bronze badges Add a comment 1 Answer Sorted by: 4 Polyfit is fine, but I think you're problem is a bit simpler. You have a 2 x n...
Matlab实现线性回归和逻辑回归_LinearRegression 下载积分:1500 内容提示: 分类: Machine Learning MATLAB博客专家福利 2015年4月微软MVP申请 有奖征文--我亲历的京东发展史 参与迷你编程马拉松赢iPhone 6 Matlab实现线性回归和逻辑回归: Linear Regression & LogisticRegression2012-07-10 14:42 21426人阅读 评论(29)...
I'm trying to implement the linear regression with a single variable for linear regression (exercise 1 fromstandford's courseon coursera about machine learning). My understanding is that this is the math : Now, my code implementation would be like this: ...