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ggplot2:如何做出以一天的24个小时为横坐标的频度图?

现有一个类似如下结构的数据集:

datas=c('01:54:32','02:55:20','12:55:41','16:44:12'....)

如何根据数据集画出横坐标以"00:00:00"为原点"59:59:59"为结尾的频度图?
R语言中时间的转化貌似没有“00:00:00”这种格式,是否得转化为替代的数值画出来,然后再手动修改坐标轴?有没有简便的方法?请大神不吝指导


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