机器学习之Octave：plot函数绘图

基础

plot(X,y);

X：数据矩阵，每一列为一个特征
y：数据结果向量

形状参数

• linestyle
  ‘-’ solid lines (default).
  ‘–’ dashed lines.
  ‘:’ dotted lines.
  ‘-.’ dash-dotted lines.
• markerstyle
  ‘+’ crosshair
  ‘o’ circle
  ‘*’ star
  ‘.’ point
  ‘x’ cross
  ‘s’ square
  ‘d’ diamond
  ‘^’ upward-facing triangle
  ‘v’ downward-facing triangle
  ‘>’ right-facing triangle
  ‘<’ left-facing triangle
  ‘p’ pentagram
  ‘h’ hexagram
• color
  ‘k’ blacK
  ‘r’ Red
  ‘g’ Green
  ‘b’ Blue
  ‘m’ Magenta
  ‘c’ Cyan
  ‘w’ White
• LineWidth：number
• MarkerSize ：number
• MarkerEdgeColor：number
• MarkerFaceColor：number

e.g. ：

plot(angles, y, 'ro', 'LineWidth', 2, MarkerSize, 7);

其它

• 标题

title('...');

• 横轴、纵轴

xlabel('...');
ylabel('...');

• 图例

legend('...'[, '...'])