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plotly parcoords (parallel coordinates) cannot plot a single line

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#2,385 3 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Stale
Tech stack
r

Research direction

Start by running the supplied R example with plot_ly(type = 'parcoords') and the one-row iris data frame. Trace the parallel-coordinates rendering path to determine why a single line is omitted; done means the example renders that line without warnings or errors.

Written by the indexing model from the issue text.

Description

The following generates no plot, no warnings and no errors:

# Example from https://plotly.com/r/parallel-coordinates-plot/
library(plotly)
df <- read.csv("https://raw.githubusercontent.com/bcdunbar/datasets/master/iris.csv")
df <- df[1L, , drop=FALSE] # plot one line only
fig <- df %>% plot_ly(type = 'parcoords',
          line = list(color = ~species_id,
                      colorscale = list(c(0,'red'),c(0.5,'green'),c(1,'blue'))),
          dimensions = list(
            list(range = c(2,4.5),
                 label = 'Sepal Width', values = ~sepal_width),
            list(range = c(4,8),
                 constraintrange = c(5,6),
                 label = 'Sepal Length', values = ~sepal_length),
            list(range = c(0,2.5),
                 label = 'Petal Width', values = ~petal_width),
            list(range = c(1,7),
                 label = 'Petal Length', values = ~petal_length)
            )
          )
fig
Dominant language
R
Stars
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Forks
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PR merge metrics
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