CODEWITHSUNDEEP
rplotplotly
J_F
J_F

Reputation: 10372

Error bars in plot_ly

I'm creating a simple plot with plot_ly and come to a strange behaviour when using error bars. I have tried the example here, but even the official manual is wrong (in my opinion). Here an MWE:

library(plotly)

df <- data.frame(
      x = 1:3,
      y = c(7,5,9),
      sd = c(0.2, 0.1, 0.7))

plot_ly(df,
        x = ~x,
       error_y = list(value = ~sd)) %>%
  add_markers(y = ~y)

The result is not the expected plot, because the errorbars are always 10% of the value, even in the official examples (see link above). It's obvious that the errorbar are much higher than the given ones in df. The error are always 10 % of the original value.

enter image description here

I tried different approaches, e.g. error_y = list(value = ~sd, type = "data")) (seen here), but nothing worked.

I'm thankful for every hint to solve this issue.

Upvotes: 1

Views: 4277

Answers (1)

Maximilian Peters
Maximilian Peters

Reputation: 31709

It seems that the Plotly team has forgotten to update its own examples. The correct syntax for getting error bars in R Plotly is

error_y = list(array=~sd)

enter image description here

library(plotly)

df <- data.frame(
  x = c(1, 2, 3),
  y = c(7, 5, 3),
  sd = c(0.1, 0.3, 0.8))

plot_ly(df,
        x = ~x,
        y = ~y,
        error_y = list(array=~sd),
        type='scatter')

Upvotes: 3

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