[R] Merging multiple .csv files into one dataframe

[Jeff Newmiller]

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On June 9, 2021 1:28:13 PM PDT, Esthi Erickson <ericksonesthi using gmail.com> wrote:
>Hi,
>
>I am trying to merge columns from four different .csv files into one
>dataframe. I am trying to do something like this
>https://statisticsglobe.com/merge-csv-files-in-r . I am taking long
>format
>.csv files, 1 being the base file (testing-long.csv) which I change to
>wide
>format first and the three others being supplemental files that should
>add
>columns plight, plightLitter, Root Biomass, NO3Soil, NH4Soil and then
>add
>data to cells where the it matches any one of the values for columns,
>"Exp", "Year", "Field", "Plot", "NTrt", "NAdd", "NitrAdd", "NAtm.NAdd".
>So
>the values for the supplemental files need not match every single one
>of
>the columns listed above and if the value does not match all the
>columns
>exactly the cell for that column/row should not be filled. When I try
>the
>method from that website, I do not see the supplemental columns being
>added. I am wondering if there is a better way to merge multiple .csv
>files. I hope this makes sense, but it is quite confusing even to me,
>so I
>am more than happy to clarify. I am attaching the files in question.
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