plotly adding a source or caption to a chart

问题

Is there a way to add a data source / caption to a chart in Plotly, similar with what can be done in ggplot with the caption argument:

labs(caption = "source: data i found somewhere") 

i.e., so we can display the data source at the bottom right of the graph, in a smaller font.

回答1:

annotation offers a simple way to add a caption to a chart in plotly:

library(plotly)
plot_ly(x=~hp, y=~mpg, data=mtcars, type="scatter", mode="marker") %>% 
 layout(annotations = 
 list(x = 1, y = -0.1, text = "Source: data I found somewhere.", 
      showarrow = F, xref='paper', yref='paper', 
      xanchor='right', yanchor='auto', xshift=0, yshift=0,
      font=list(size=15, color="red"))
 )

.

More details are given here and here.

来源：https://stackoverflow.com/questions/45103559/plotly-adding-a-source-or-caption-to-a-chart