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並前往https://github.com/seanchrismurphy/A-Psychologists-Guide-to-R/blob/master/Week%204/Exercise%20answers/Exercise%203%20-%20Using%20grep%20-%20with%20answers.R

A-Psychologists-Guide-to-R/Exercise 3 - Using grep - GitHub

Using grep() with colnames() to subset data frames. # Often when we receive our raw data, we will have variables that are grouped together in some way.

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