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並前往https://vimsky.com/zh-tw/examples/usage/determine-the-weekday-on-a-specific-date-in-r-programming-weekdays-function.html

R語言weekdays()用法及代碼示例- 純淨天空

R program to find the weekday # on a specific date # Specifying the date date <- as.POSIXlt("2020-06-23") date # Calling weekdays() function weekdays(date).

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