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# Histograms in R

How to make a histogram in R.

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New to Plotly?

Plotly is a free and open-source graphing library for R. We recommend you read our Getting Started guide for the latest installation or upgrade instructions, then move on to our Plotly Fundamentals tutorials or dive straight in to some Basic Charts tutorials.

#### Basic Histogram

library(plotly)
fig <- plot_ly(x = ~rnorm(50), type = "histogram")

fig


#### Normalized Histogram

library(plotly)
fig <- plot_ly(x = ~rnorm(50),
type = "histogram",
histnorm = "probability")

fig


#### Specify Binning Function

library(plotly)

x = c("Apples","Apples","Apples","Organges", "Bananas")
y = c("5","10","3","10","5")

fig <- plot_ly(y=y, x=x, histfunc='sum', type = "histogram")
fig <- fig %>% layout(yaxis=list(type='linear'))

fig


#### Horizontal Histogram

library(plotly)
fig <- plot_ly(y = ~rnorm(50), type = "histogram")

fig


#### Overlaid Histograms

fig <- plot_ly(alpha = 0.6)
fig <- fig %>% add_histogram(x = ~rnorm(500))
fig <- fig %>% add_histogram(x = ~rnorm(500) + 1)
fig <- fig %>% layout(barmode = "overlay")

fig


#### Stacked Histograms

fig <- plot_ly(alpha = 0.6)
fig <- fig %>% add_histogram(x = ~rnorm(500))
fig <- fig %>% add_histogram(x = ~rnorm(500) + 1)
fig <- fig %>% layout(barmode = "overlay")

fig


#### Cumulative Histogram

library(plotly)
fig <- plot_ly(x = ~rnorm(50),
type = "histogram",
cumulative = list(enabled=TRUE))

fig


### Share bins between histograms

In this example both histograms have a compatible bin settings using bingroup attribute.

library(plotly)

fig <- plot_ly(
type='histogram',
x=~rnorm(100, 5),
bingroup=1)

type='histogram',
x=~rnorm(20, 5),
bingroup=1)

fig <- fig %>% layout(
barmode="overlay",
bargap=0.1)

fig


Note that traces on the same subplot, and with the same barmode ("stack", "relative", "group") are forced into the same bingroup, however traces with barmode = "overlay" and on different axes (of the same axis type) can have compatible bin settings. Histogram and histogram2d trace can share the same bingroup.

library(plotly)

fig <- plot_ly(
type='histogram',
x=~rnorm(100, 5))

type='histogram',
x=~rnorm(20, 5))

fig <- fig %>% layout(
barmode="stack",
bargap=0.1)

fig


### Reference

Dash for R is an open-source framework for building analytical applications, with no Javascript required, and it is tightly integrated with the Plotly graphing library.

Learn about how to install Dash for R at https://dashr.plot.ly/installation.

Everywhere in this page that you see fig, you can display the same figure in a Dash for R application by passing it to the figure argument of the Graph component from the built-in dashCoreComponents package like this:

library(plotly)

fig <- plot_ly()
# fig <- fig %>% add_trace( ... )
# fig <- fig %>% layout( ... )

library(dash)
library(dashCoreComponents)
library(dashHtmlComponents)

app <- Dash$new() app$layout(
htmlDiv(
list(
dccGraph(figure=fig)
)
)
) 