Failed conversion from ggplot object to plotly

Question

I just built a new terrarium and I'm trying to monitor the humidity levels over time to make sure it's set up for optimal plant-growth, and I thought I'd use R to do it. I'm using POSIXct to record date/time humidity measurements which is then recorded into a ggplot which I then try to turn into a plotly object; unfortunately, this last step doesn't work. I'm not sure what is causing it as I have very little experience with plotly. Here is my code; I apologise if it's messy/not up to scratch, I'm a) tired and b) a student so any tips would also be welcome!

When commenting out the plotly line, I get this (which is what I want):

I'd also like it if I could 'anchor' the date labels to every 6 hours from a certain time - using scale_x_datetime limits/breaks varies upon how many measurements, I'd like a break at 00:00, 06:00, 12:00 and 18:00 every day. How can I do that?

library(ggplot2)
library(lubridate)
library(scales)
library(gridExtra)
library(plotly)
library(hrbrthemes)

measurement.time = as.POSIXct(c("2020-08-23 21:45 GMT", "2020-08-23 22:45 GMT"), tz = 'Europe/London', format = "%Y-%m-%d %H:%M")

humidity = c(99,95)

data.forplot = data.frame(measurement.time, humidity)

Sys.setenv(TZ='Europe/London')

viv.plot = ggplot(data.forplot, aes(x = measurement.time, y = humidity)) +
  geom_point() +
  geom_line(alpha = 0.3) +
  ylab("Humidity (%)") +
  scale_y_continuous(limit=c(0,100),oob=squish) +
  scale_x_datetime(name = "Date", date_labels = "%B %d %H:%M") +
  ggtitle(~""*underline(Vivarium~Humidity~Levels)) +
  theme(plot.title = element_text(hjust=0.5, size =18 )) +
  geom_area(fill="#69b3a2", alpha=0.5)

viv.plot = ggplotly(viv.plot)

print(viv.plot)

plotly is having problems with this line: ggtitle(~""*underline(Vivarium~Humidity~Levels)). Do you really need the title underlined? — Dave2e
– Dave2e, Commented Aug 23, 2020 at 21:57
@Dave2e Thanks for replying! I removed both this line and the theme() line however now I just get an empty plot box: prnt.sc/u4mkfm Using plot_ly also doesn't work for me, it gives the same issue (code is same down to data.forplot): plotlyplot = plot_ly(data.forplot, type = 'scatter', mode = 'lines', x = ~measurement.time, y = ~humidity, text = ~paste('Time: ', measurement.time, '\n'), hoverinfo = 'text' ) print(plotlyplot) — RedMoose
– RedMoose, Commented Aug 23, 2020 at 22:01

Dave2e · Accepted Answer · 2020-08-23 22:30:35Z

1

The following code snippet works with plotly, unfortunately the title is not underlined.

measurement.time = as.POSIXct(c("2020-08-23 21:45 GMT", "2020-08-23 22:45 GMT"), tz = 'Europe/London', format = "%Y-%m-%d %H:%M")
humidity = c(99,95)
data.forplot = data.frame(measurement.time, humidity)

viv.plot = ggplot(data.forplot, aes(x = measurement.time, y = humidity)) +
   geom_point() +
   geom_line(alpha = 0.3) +
   ylab("Humidity") +
   scale_y_continuous(limit=c(0,100),oob=squish) +
   scale_x_datetime(name = "Date", date_labels = "%B %d %H:%M") +
   ggtitle("Vivarium Humidity Levels") +                            #Works
#   ggtitle(expression(underline("Vivarium Humidity Levels"))) +    #does not work with plotly, works with ggplot
   theme(plot.title = element_text(hjust=0.5, size =18, face="bold" )) +
   geom_area(fill="#69b3a2", alpha=0.5)

print(ggplotly(viv.plot))

Plotly does not seem to understand the "expression" syntax and thus is causing the problem. Hopefully this is good enough for your project.

answered Aug 23, 2020 at 22:30

Dave2e

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2 Comments

RedMoose Over a year ago

Thanks for coming back with an answer! Unfortunately, when I source the code the plot viewer is white with no output - I've uploaded a link here: imgur.com/DdsUzrL I'm not sure what the problem is, I've tried making the plot window larger but that hasn't worked. Does it work for you?

RedMoose Over a year ago

Having gone away and done a clean install with new versions of R, Rstudio and all the packages it now works. Thanks so much!

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