===== challenge 1: git的使用 =====
- 从github到本地:
git pull: 从git中拉取到本地
- 从本地到github
git add *
git commit -m "update"
git push
===== challenge 1: 使用octave生成测试集 ======
- octave code
------ first circle -----
生成100个theta值
theta1 = rand(100,1) * 2 * pi
x1 = sin(theta1) * 1
y1 = cos(theta1) * 1
plot(x1, y1, 'r * ')
----- second circle -----
theta2 = rand(100,1) * 2 * pi
x2 = sin(theta2) * 2
y2 = cos(theta2) * 2
plot(x2, y2, 'r * ')
plot(x1, y1, 'r * ', x2, y2, 'b * ')
save sample1 x1
save sample2 y1
save sample3 x2
save sample4 y2