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Day 25 R Programming

https://stackoverflow.com/questions/18222286/dynamically-select-data-frame-columns-using-and-a-vector-of-column-names

https://stackoverflow.com/questions/12614953/how-to-create-a-numeric-vector-of-zero-length-in-r


https://stackoverflow.com/questions/7355187/error-in-if-while-condition-missing-value-where-true-false-needed

http://www.dummies.com/programming/r/how-to-add-observations-to-a-data-frame-in-r/

https://stackoverflow.com/questions/11561856/add-new-row-to-dataframe-at-specific-row-index-not-appended

https://stackoverflow.com/questions/22235809/append-value-to-empty-vector-in-r

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