Melting data frame to produce scatter plot

Asked Nov 23 '15 at 15:46

Active Nov 23 '15 at 15:46

Viewed 289 times

I have the following data structure.

library(MASS)

mu1 <- c(2, -3)
mu2 <- c(2, 5)
rho <- 0.5
s1 <- 1
s2 <- 3
Sigma <- matrix(c(s1^2, rho * s1 * s2, rho * s1 * s2, s2^2), byrow = TRUE, nrow = 2)
n <- 50

X1 <- mvrnorm(n, mu = mu1, Sigma = Sigma)
X2 <- mvrnorm(n, mu = mu2, Sigma = Sigma)
y <- rep(c(0, 1), each = n)
X <- data.frame(rbind(X1, X2), class = y)

I wonder how to properly melt (produce long form) this data frame to produce the following scatter plot.

asked Nov 23 '15 at 15:46

Andrej

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this is just `ggplot(X, aes(X1, X2, colour = factor(class))) + geom_point()` is it not? – rawr Nov 23 '15 at 15:53
@rawr Yes it is, but I wonder if there is a solution with melting the data frame. – Andrej Nov 23 '15 at 16:12
2

The data are currently in the right format for this plot. What do you think is wrong about it? – Heroka Nov 23 '15 at 16:24
@Heroka, it's OK than. I wasn't sure. – Andrej Nov 23 '15 at 16:30
4

Generally, if ggplot does what you want without a lot of code-repeating (like 5 calls to `geom_line`), you're doing fine. – Heroka Nov 23 '15 at 16:34

Melting data frame to produce scatter plot

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