Time flies.today comes your birthday. the best of all good things for this special day and all the many more to come.many happy returns!

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下面以眼睛和头发颜色的数据(HairEyeColor)为例说明nPlot绘图的基本原理。我们按照眼睛的颜色迚行分组(group=”eye”),对头发颜色人数绘制柱状图，幵将类型设置为柱状图组合方式(type=” multiBarChart”)，这样可以实现分组和叠加效果.