syms + ezplot = rocks!

Problem. plot contours of the cost function J in the parameter space 

- 매트랩 코드 
%% clear all

clear all;

close all;

clc;            % clear screen

%% load data

data = load('hw01_data1.dat');

input = data(:, 1:2);

target = data(:, 3);

% (a) get optimal value of the parameter vector

parameter = pinv(input)*target;

parameter %print parameter vector

% (b)

cov_input = cov(input);

[V, D] = eig(cov_input);

V %print e.vector of cov

D %print e.value of cov

%plot contours of the cost function J in the parameter space

syms p1;

syms p2;

p = [p1 ; p2];

J = (target - input*p)'*(target - input*p) - 1;

ezplot(J, [4.6 5.4 -1.8 -1]);