scatter

scatter(x,y,<sz>,<c>) creates a scatter plot with circles at the locations specified by the vectors x and y, in the size and color specified by sz and c
- Size:
  - To plot each circle with equal size, specify sz as a scalar
  - To plot each circle with a different size, specify sz as a vector with length equal to the length of x and y
- Color:
  - To plot all circles with the same color, specify c as a color name or an RGB triplet
  - To use varying color, specify c as a vector or a three-column matrix of RGB triplets
    - 这里的 vector 对应的是 MATLAB Graphics Colormap 中的颜色的索引
scatter(___,'filled') fills in the circles
scatter(___,mkr) specifies the marker type
scatter(___,Name,Value) modifies the scatter chart using one or more name-value pair arguments
scatter(ax,___) plots into the axes specified by ax instead of into the current axes
s = scatter(___) returns the Scatter object

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