clc?clear;
x?=?load（‘ex1_1x.dat‘）;?y?=?load（‘ex1_1y.dat‘）;
J_vals?=?zeros?（100??100）;
theta0_vals?=?linspace（-3?3?100）;
theta1_vals?=?linspace（-1?1?100）;
plot（x?y?‘o‘）;
ylabel（‘Height?in?meters‘）;?xlabel（‘Age?in?years‘）;
m?=?length（y）;
x?=?[ones（m?1）?x];?
alpha?=?0.07;
theta?=?zeros（2?1）;
for?k?=?1:1500?
	theta（1）?=?theta（1）?-?alpha?/?m?*?sum（x?*?theta?-?y）;?
	theta（2）?=?theta（2）?-?alpha?/?m?*?sum（（x?*?theta?-?y）?.*?x（:?2））;
end?
plot（x（:?2）?y?‘o‘）;
hold?on
plot（x（:?2）?x?*?theta?‘-‘）
legend（‘Training?data‘?‘Linear?regression‘）

age?=?[1?3.5;1?7];
height?=?age?*?theta;

%J（theta）
J_vals?=?zeros（100?100）;
theta0_vals?=?linspace（-3?3?100）;
theta1_vals?=?linspace（-1?1?100）;
for?i?=?1:length（theta0_vals）
	for?j?=?1:length（theta1_vals）
????????t?=?[theta0_vals（i）;theta1_vals（j）];
????	J_vals（i?j）?=?（0.5?/?m）?.*?（x?*?t?-?y）‘?*?（x?*?t?-?y）;
	end
end
J_vals?=?J_vals‘;?
figure;?
surf（theta0_vals?theta1_vals?J_vals）
xlabel（‘\theta_0‘）;?ylabel?（‘\theta_1‘）?

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????850??2018-08-29?10:18??Matlab\exp1\ex1_1x.dat

?????文件????????850??2018-08-29?10:18??Matlab\exp1\ex1_1y.dat

?????文件???????1551??2018-08-29?10:18??Matlab\exp1\ex1_2x.dat

?????文件????????799??2018-08-29?10:18??Matlab\exp1\ex1_2y.dat

?????文件???????1022??2018-09-28?19:13??Matlab\exp1\exp1_1.m

?????文件????????923??2018-09-28?19:43??Matlab\exp1\exp1_2.m

?????文件???????2640??2018-08-29?10:18??Matlab\exp2\ex2x.dat

?????文件???????1360??2018-08-29?10:18??Matlab\exp2\ex2y.dat

?????文件????????714??2018-10-12?08:37??Matlab\exp2\exp2_1.m

?????文件????????831??2018-10-12?00:37??Matlab\exp2\exp2_2.m

?????文件?????????60??2018-09-11?17:58??Matlab\exp3\ex3Linx.dat

?????文件?????????54??2018-09-11?17:58??Matlab\exp3\ex3Liny.dat

?????文件???????1979??2018-09-11?17:58??Matlab\exp3\ex3Logx.dat

?????文件????????234??2018-09-11?17:58??Matlab\exp3\ex3Logy.dat

?????文件????????595??2018-10-26?00:29??Matlab\exp3\exp3_1.m

?????文件???????1224??2018-10-26?09:11??Matlab\exp3\exp3_2.m

?????文件????????570??2018-09-11?17:58??Matlab\exp3\map_feature.m

?????文件???????5664??2018-09-01?15:03??Matlab\exp4\convData.m

?????文件???????1971??2018-11-11?20:54??Matlab\exp4\exp4.m

?????文件????????501??2018-08-30?11:21??Matlab\exp4\nursery.c45-names.txt

?????文件????1059369??2018-08-30?10:08??Matlab\exp4\nursery.data.txt

?????文件???????4137??2018-08-30?11:21??Matlab\exp4\nursery.names.txt

?????文件??????53280??2018-09-01?15:43??Matlab\exp4\test_data.txt

?????文件?????180000??2018-09-01?15:43??Matlab\exp4\training_data.txt

?????文件????2209063??2006-09-19?03:58??Matlab\exp5\data5\test-01-images.svm

?????文件??????11829??2018-09-03?14:46??Matlab\exp5\data5\test_1.txt

?????文件??????11871??2018-09-03?14:47??Matlab\exp5\data5\test_2.txt

?????文件???13315970??2006-09-19?03:58??Matlab\exp5\data5\train-01-images.svm

?????文件??????35528??2018-09-03?14:46??Matlab\exp5\data5\training_1.txt

?????文件??????35641??2018-09-03?14:47??Matlab\exp5\data5\training_2.txt

............此處省略478個文件信息