Preparing the data

Unlike prior chapters, where we prepared the data for you for unsupervised learning, the goal of this chapter is to step you through a more realistic and complete workflow.

Recall from the video that the first step is to download and prepare the data.

Deze oefening maakt deel uit van de cursus

Unsupervised Learning in R

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Oefeninstructies

Use read.csv() function to download the CSV (comma-separated values) file containing the data from the URL provided. Assign the result to wisc.df.
Use as.matrix() to convert the features of the data (in columns 3 through 32) to a matrix. Store this in a variable called wisc.data.
Assign the row names of wisc.data the values currently contained in the id column of wisc.df. While not strictly required, this will help you keep track of the different observations throughout the modeling process.
Finally, set a vector called diagnosis to be 1 if a diagnosis is malignant ("M") and 0 otherwise. Note that R coerces TRUE to 1 and FALSE to 0.

Praktische interactieve oefening

Probeer deze oefening eens door deze voorbeeldcode in te vullen.

url <- "https://assets.datacamp.com/production/course_1903/datasets/WisconsinCancer.csv"

# Download the data: wisc.df


# Convert the features of the data: wisc.data


# Set the row names of wisc.data
row.names(wisc.data) <- wisc.df$___

# Create diagnosis vector
diagnosis <- as.numeric(wisc.df$diagnosis == ___)

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