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並前往https://towardsdatascience.com/how-to-save-time-with-data-visualization-using-stack-in-r-with-ggplot2-81b95300318c

How to Save Time with Data Visualization using Stack in R ...

Use real European economic indicator data in R with stack, grep, ggplot, ... I am converting back to a data frame, explicitly naming the Date column, ...

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