Stem Plots in ggplot2

How to make Stem Plots in ggplot2 with Plotly.

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Stem plot

library(plotly)
library(ggplot2)

x <- 0:25
y <- cbind(exp(-.07*x)*cos(x), exp(.05*x)*cos(x))
df <-  data.frame(y=c(exp(.05*x)*cos(x),exp(-.07*x)*cos(x)),
   x=rep(x,2), grp=factor(rep(c(1,2),each=length(x))))

p <- ggplot(aes(group=grp, col=grp, shape=grp), data=df) + 
    geom_hline(aes(yintercept=0)) +
    geom_segment(aes(x,y,xend=x,yend=y-y)) + 
    geom_point(aes(x,y),size=3) 

ggplotly(p)

What About Dash?

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) 
        )
     )
)

app$run_server(debug=TRUE, dev_tools_hot_reload=FALSE)