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Create a decision boundary

The dataset you created in the previous exercise is available to you in the dataframe df (recall that it consists of two uniformly distributed variables x1 and x2, lying between 0 and 1). In this exercise you will add a class variable to that dataset. You will do this by creating a variable y whose value is -1 or +1 depending on whether the point (x1, x2) lies below or above the straight line that passes through the origin and has slope 1.4.

This exercise is part of the course

Support Vector Machines in R

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Exercise instructions

  • Create a new column y in the dataframe df with the following specs:
  • y = -1 if x2 < 1.4*x1
  • y = 1 if x2 > 1.4*x1

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

#classify data points depending on location
df$y <- factor(ifelse(df$___ - ___*df$___ < 0, -1, 1), 
    levels = c(-1, 1))
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