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I'm trying to animate a map graph using gganimate but am running into the following error:

Error in seq.default(range[1], range[2], length.out = nframes) : 
'from' must be a finite number

It seems like this usually occurs when the variable used for transition_time() isn't numeric or the data's in the wrong form, but I don't know how that could be in my case; my data's in the proper long format and the variable for transition_time() is numeric and always finite.

Is this a specific issue with plot_usmap()? Am I missing something obvious?

My data is on GitHub. Code below:

library("usmap")
library("ggplot2")
library("gganimate")

load("helpdata.Rda")

check = plot_usmap(data = df_map, values = "frac_cov") +
  scale_fill_stepsn(breaks=c(-100, 0, 0.1, 0.2, 0.3, 0.4, 0.5,
                             0.6, 0.7, 0.8, 0.9, 1, 100),
                    colors=c("red", "gray100", "gray90", "gray80", "gray70", "gray60",
                             "gray50", "gray40", "gray30", "gray20", "gray10", "red"),
                    na.value="white") +
  labs(fill = "", title = "Fraction of excess deaths\nattributed to COVID-19") +
  theme(legend.position = "right", plot.title = element_text(hjust = 0.5)) +
  transition_time(month)

anim <- animate(check, nframes=9, fps=1)

Thanks so much!

Devin Werner
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1 Answers1

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Your dataset has 50 unique fips values. The map data in the usmap package comes with 51. When plot_usmap creates the ggplot layers, it merged your dataset with the map data by fips code, which adds on NA values to the month column since one of the fips codes has no match.

(transition_time makes a fuss about this while transition_state doesn't. I'm not familiar enough with the gganimate package to theorize why that's the case.)

Add the following to your dataset before plotting. It should solve the problem:

df_map <- rbind(df_map,
                data.frame(month = sort(unique(df_map$month)),
                           frac_cov = 0,
                           fips = 11)) # the missing fips value

Result after running the same animation code shown in the question:

map

Z.Lin
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  • For posterity's sake--I also had to add `library("transformr")` to get the animation to run, and mine doesn't animate smoothly like Z.Lin's example--probably have to mess around with the transformr package to get that (?). – Devin Werner Nov 11 '20 at 15:52
  • You may wish to check your gganimate package version. The more recent ones shouldn't require transformr to be loaded, and easing between transitions should also be linearly smooth by default. – Z.Lin Nov 12 '20 at 00:01