Error in file(file, “rt”) : cannot open the connection [duplicate]

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You need to change directory <- ("./specdata") to directory <- ("./specdata/")

Relative to your current working directory, you are looking for the file 001.csv, which is in your specdata directory.

This question is nearly impossible to answer without any context, since you have not provided us with the structure of your working directory here. Fortunately for you, I have already taken R Programming on Coursera, so I already did this homework question.

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