Back in 1975, a graph plotting fertility rate against the HDI fell as the HDI rose.
1975年的图表显示，生育率的曲线随着HDI上升而降低。
Graph plotting part consists of histogram, cross section drawing, clustering spectral pattern, 2-dimensinoal factor scattergram.
图形绘制包括：直方图、因子平面散点图、聚类谱系图、剖面图。
This calculator can handle math functions, variables and a lot of libraries. Graph plotting is done with SDL. By the way, you can easily write your own library.
他可以解决数学的问题，有很多的库，SDL绘图，通过这方法，你可以很简单用自己的库来编写。
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