R language ggplot2 visualization: gganimate package creates dynamic line graph animation (GIF) and uses transition_ The reveal function displays data step by step along a given dimension in the animat

R Language ggplot2 visualization ：gganimate Package create dynamic line chart animation (gif)、 Use transition_reveal Function displays data step by step along a given dimension in the animation 、 Add data points in the moving direction of the polyline

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