The group () method of owc is used for series grouping.

(Note: I was posted on a temporary blog for preparing a chart project a year ago, and now I transfer it here)

After understanding the owc's dual-axis method, these two days are confused about how to specify the corresponding axis for series.

The Ungroup (true) method can assign the series to the coordinate axes of different scales. After adding a new axis, use the get_scalings () method to automatically generate the coordinate value. However, if a series is regenerated and the Ungroup (true) method is applied, if a new coordinate is generated, the system automatically generates an undisplayed coordinate. If a new coordinate is generated, the system adds another coordinate axis at the specified position. What should I do if I want to share the coordinates of this series with the just-added series of applications?

After two days, I finally found a group () method: expression. group (series). This method can be used to specify a group for the specified series. As a result, the series in the same group can share the same axis.