# 1 Goal

The goal of this tutorial is to learn how to read a csv without typing the name into R. We will ask which files ara available in the working directory and open the file we want to use.

# 2 Listing the files in our folder

# We can list all files that exist in our working directory
list.files()
## [1] "iris.csv"                    "prediction.csv"
## [3] "transactions.csv"            "UsefulConsoleFunctions.html"
## [5] "UsefulConsoleFunctions.Rmd"
# Now we can filter only the csv files existing in our working directory
list.files(pattern="*.csv")
## [1] "iris.csv"         "prediction.csv"   "transactions.csv"
# Finally we can store this information in a variable
filenames <- list.files(pattern="*.csv")

# We can see all the filenames
filenames
## [1] "iris.csv"         "prediction.csv"   "transactions.csv"
# And read the selected file
head(read.csv(filenames[1], header = TRUE, sep = ","))
##   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
## 1          5.1         3.5          1.4         0.2  setosa
## 2          4.9         3.0          1.4         0.2  setosa
## 3          4.7         3.2          1.3         0.2  setosa
## 4          4.6         3.1          1.5         0.2  setosa
## 5          5.0         3.6          1.4         0.2  setosa
## 6          5.4         3.9          1.7         0.4  setosa

# 4 Conclusion

In this tutorial we have learnt how to read files using the list of filenames.