In the code examples below, diamonds data set belonging to ggplot2 package is used. One must load the ggplot2 package (require(“ggplot2”)) before executing the code samples given below.
# Most simplistic density curve
ggplot(diamonds, aes(x=carat)) + geom_histogram(aes(y=..density..)) +
geom_density() +
labs(title="Histogram & Density Curve", x="Carat")
Following diagram would get displayed by executing the above code.
# Density curve with histogram painted using body color as white and
# border color as red
ggplot(diamonds, aes(x=carat)) + geom_histogram(col="red", fill="white", aes(y=..density..)) +
geom_density() +
labs(title="Histogram & Density Curve", x="Carat")
Following diagram would get displayed by executing the above code.
# Density curve with border color as blue, body color as green and
# transparency index as 0.2;
ggplot(diamonds, aes(x=carat)) + geom_histogram(col="red", fill="white", aes(y=..density..)) +
geom_density(col="blue", fill="green", alpha=0.2) +
labs(title="Histogram & Density Curve", x="Carat")
Following diagram would get displayed by executing the above code.
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