Comments (2)
bklingen
commented on May 27, 2024
I don't think you should map to variables inside markers. Declare the size mapping "outside", see below, and you get the correct result:
plot_ly(df,
x = ~x,
y = ~y,
type = "scatter",
mode = "markers",
marker = list(sizeref = 0.1),
size = ~z,
color = ~z < 3,
colors = c(I("green"), I("red")),
text = ~paste0("z: ", z))
from plotly.r.
JElchison
commented on May 27, 2024
Hi @bklingen, thanks for your help!
png mismatch
As an aside, I don't think your png matches your code, because (given your color threshold of z < 3) the success case should show 2 reds on the small side, not 3. However, that's irrelevant to your tip.
Your workaround, with new warnings
But beyond that, it does look like setting the size attribute instead of marker.size successfully works around my issue.
Did you notice that your workaround causes these warnings?
Warning messages:
1: `line.width` does not currently support multiple values.
2: `line.width` does not currently support multiple values.
I'm not sure what to make of those, but there are some SO topics related, such as: https://stackoverflow.com/questions/52692760/spurious-warning-when-mapping-marker-size-in-plotly-r
Intended behavior?
More critically, though, I do question is whether this outcome is the intended behavior. Do you have any supporting documentation you could link to, showing why I should use size instead of marker.size?
Here's what I could find:
- https://plotly.com/r/reference/scatter/, which states that:
Bubble charts are achieved by setting
marker.sizeand/ormarker.colorto numerical arrays.
According to the same documentation page, neither size nor color is a parent-level attribute. colors isn't mentioned anywhere (and it produces different behavior from colorscale).
Further, this doesn't seem to line up with the examples at...
- https://plotly.com/r/bubble-charts/, where 2 of the 7 examples use
sizeinstead ofmarker.size
Strangely, 7 of 7 examples there use color instead of marker.color. Further, all examples use the undocumented colors (top level) attribute.
Summary -- A bug in code or documentation?
I'm (very) happy to use your workaround, but because the documented code doesn't produce the documented behavior, it seems like either:
- what I originally reported is a bug in the code
- the documentation should be updated to be consistent with the code
Any additional thoughts? Thanks!
Workaround in action
Finally, for posterity, here's the functioning workaround, but with 2 warnings:
library(plotly)
#> Loading required package: ggplot2
#>
#> Attaching package: 'plotly'
#> The following object is masked from 'package:ggplot2':
#>
#> last_plot
#> The following object is masked from 'package:stats':
#>
#> filter
#> The following object is masked from 'package:graphics':
#>
#> layout
df <- data.frame(x = c(1, 2, 3, 4, 5),
y = c(1, 2, 3, 4, 5),
z = c(1, 2, 3, 4, 5))
plot_ly(df,
x = ~x,
y = ~y,
type = "scatter",
mode = "markers",
marker = list(sizeref = 0.1),
# `size` is undocumented at this level. https://plotly.com/r/reference/scatter/ shows `marker.size`
size = ~z,
# `color` is undocumented at this level. https://plotly.com/r/reference/scatter/ shows `marker.color`
color = ~z < 3,
# `colors` is undocumented
colors = c(I("green"), I("red")),
name = ~ifelse(z < 3, "Red", "Green"),
text = ~paste0("z: ", z))
#> Warning: `line.width` does not currently support multiple values.
#> Warning: `line.width` does not currently support multiple values.
Created on 2024-04-09 with reprex v2.1.0
Session info
sessioninfo::session_info()
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#> ──────────────────────────────────────────────────────────────────────────────from plotly.r.
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