How to make plotly axes display only integer numbers

Question

I have a plotly barplot in a shiny app, showing factor levels on X axis. But on some number of inputs (2,3,4) it shows marks like 1.5, 2.5 etc (see an image). So there is a question: can I somehow make the X axis marks show only integer values?

Answer 1

plotly is guessing your axis types since your cluster labels are numeric. You can fix this by coercing your x var to a factor before/when plotting.

library(plotly)
library(dplyr)
mtcars_by_gear <- count(mtcars,gear)

plot_ly(mtcars_by_gear,
        x=~as.factor(gear), 
        y=~n)

If you want further control over axis labels you can use the layout() function's tick arguments, but the factor option seems better for your case.

plot_ly(mtcars_by_gear,
        x=~gear, 
        y=~n, 
        type="bar") %>% 
  layout(xaxis=list(tickvals=~gear,ticktext=~gear))

Answer 2

tickformat=',d'

Supposing the attributes are the same as in Python where I tested :-), you can set:

layout(xaxis=list(tickformat=',d'))

where the valid values are D3 formats.

See also: https://community.plot.ly/t/restrict-axis-ticks-labels-to-only-show-int-values/3503/4