# 2D Histogram Contour in R

How to create 2D Histogram Contour plots in R with Plotly.

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 2D Histogram Contour

``````library(plotly)

s <- matrix(c(1, -.75, -.75, 1), ncol = 2)
obs <- mvtnorm::rmvnorm(500, sigma = s)

fig <- plot_ly(x = obs[,1], y = obs[,2])

fig <- fig %>%

fig
``````

#### Styled 2D Histogram Contour

``````library(plotly)

cnt <- with(diamonds, table(cut, clarity))

fig <- plot_ly(diamonds, x = ~cut, y = ~clarity)
fig <- fig %>%
type='histogram2dcontour',
contours = list(
showlabels = T,
labelfont = list(
family = 'Raleway',
color = 'white'
)
),
hoverlabel = list(
bgcolor = 'white',
bordercolor = 'black',
font = list(
family = 'Raleway',
color = 'black'
)
)
)

fig
``````

#### 2D Histogram Contour Subplot

``````library(plotly)

x <- rnorm(1000)
y <- rnorm(1000)
s <- subplot(
plot_ly(x = x, color = I("black"), type = 'histogram'),
plotly_empty(),
plot_ly(x = x, y = y, type = 'histogram2dcontour', showscale = F),
plot_ly(y = y, color = I("black"), type = 'histogram'),
nrows = 2, heights = c(0.2, 0.8), widths = c(0.8, 0.2),
shareX = TRUE, shareY = TRUE, titleX = FALSE, titleY = FALSE
)

fig <- layout(s, showlegend = FALSE)

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)
)
)
) 