plotly bar and line chart - r

Question

I want to plot a bar together with a line chart in R with plotly.
My first attempt was
p <- plot_ly(
x = c(1,2,3,4,5),
y = c(1,2,1.5,3,2),
type='scatter',
mode='lines',
line = list(color = 'black')
)
add_trace(
p,
x = c(1,2,3,4,5),
y = c(0.5,0.7,0.6,0.9,0.8),
type='bar',
marker = list(color = 'red')
)
The result is right, but I get the following warning:
Warning message: The following attributes don't exist: 'mode', 'line'
I guess cause the bar plot in add_trace() cannot handle the line and mode parameter from the plot_ly() function. So I changed the order:
p <- plot_ly(
x = c(1,2,3,4,5),
y = c(0.5,0.7,0.6,0.9,0.8),
type='bar',
marker = list(color = 'red')
)
add_trace(
p,
x = c(1,2,3,4,5),
y = c(1,2,1.5,3,2),
type='scatter',
mode='lines',
line = list(color = 'black')
)
This time I get the following message and red markers are displayed on the black line chart.
A marker object has been specified, but markers is not in the mode
Adding markers to the mode...
How can I fix this? (I'm using the R package plotly 4.1.0)

Answer 1

I'm running plotly 4.0.1, but if I add mode='lines+markers' instead of just mode='lines' the error message goes away for me.
--edit to add full code--
For the lazy (like me), here's the full code that worked on my end:
p <- plot_ly(x = c(1,2,3,4,5),
y = c(0.5,0.7,0.6,0.9,0.8),
type='bar',
marker = list(color = 'red', opacity=0)
)
add_trace(p,
x = c(1,2,3,4,5),
y = c(1,2,1.5,3,2),
type='scatter',
mode='lines+markers',
line = list(color = 'black')
)