Introduce a margin in the dataset
Your final task for Chapter 1 is to create a margin in the dataset that you generated in the previous exercise and then display the margin in a plot. The ggplot2 library has been preloaded for you. Recall that the slope of the linear decision boundary you created in the previous exercise is 1.4.
Questo esercizio fa parte del corso
Support Vector Machines in R
Istruzioni dell'esercizio
- Introduce a margin
deltaof 0.07 units in your dataset. - Replot the dataset, displaying the margin boundaries as dashed lines and the decision boundary as a solid line.
Esercizio pratico interattivo
Prova a risolvere questo esercizio completando il codice di esempio.
#set margin
delta <- ___
# retain only those points that lie outside the margin
df1 <- df[abs(1.4*df$x1 - df$x2) > delta, ]
#build plot
plot_margins <- ggplot(data = df1, aes(x = x1, y = x2, color = y)) + geom_point() +
scale_color_manual(values = c("red", "blue")) +
geom_abline(slope = ___, intercept = 0)+
geom_abline(slope = ___, intercept = ___, linetype = "dashed") +
geom_abline(slope = ___, intercept = ___, linetype = "dashed")
#display plot
plot_margins