How to plot two histograms together in R?

532 Asked by MaxVance in Python , Asked on Jul 5, 2021

I am using R and I have two data frames: carrots and cucumbers. Each data frame has a single numeric column which lists the length of all measured carrots (total: 100k carrots) and cucumbers (total: 50k cucumbers).

I wish to plot two histogram - carrot length and cucumbers lengths - on the same plot. They overlap, so I guess I also need some transparency. I also need to use relative frequencies not absolute numbers since the number of instances in each group is different. How to plot two histograms in same figure r?

something like this would be nice but I don't understand how to create it from my two tables:

overlapped density

Answered by Megan Hudson

To plot two histograms together in R, follow these steps:

Combine the data frames:

carrots <- data.frame(length = rnorm(100000, 6, 2))

cucumbers <- data.frame(length = rnorm(50000, 7, 2.5))

carrots$veg <- 'carrot'

cucumbers$veg <- 'cucumber'

Lengths <- rbind(carrots, cucumbers)

Plot the data:ggplot(Lengths, aes(length, fill = veg)) +

    geom_histogram(alpha = 0.5, position = 'identity')

Output:

This way we can plot two histograms in same figure r.

How to plot two histograms together in R?

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