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P21代码运行报错 #8

@mcleeh

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@mcleeh

运行提示系统无法判断该如何调用函数,经验证是因为数据集“economics”的“date”格式为因子(可通过str函数查看),需先转换为日期格式(economics$date<-format(economics$date,%Y/%m/%d)),转换后通过str函数可以看到“date”格式变为日期了。

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