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将相关系数矩阵转换为列表的形式

请问DolphinDB database有没有快捷的方法将相关系数矩阵转换为列表的形式,或者有没有介绍矩阵数据处理的专题文章?手头的问题类似下图中描述。matrix_20200526181831.png


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可以用类似下面这样的sql语句:

table(corrMatrix.columnNames() as sym, corrMatrix).unpivot(`sym, syms).rename!(`sym`corrSym`corr)

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